diff --git a/SabreTools.Library/DatFiles/DatFile.cs b/SabreTools.Library/DatFiles/DatFile.cs
index 93564921..f0c1fab1 100644
--- a/SabreTools.Library/DatFiles/DatFile.cs
+++ b/SabreTools.Library/DatFiles/DatFile.cs
@@ -5658,6 +5658,12 @@ namespace SabreTools.Library.DatFiles
                 outfileNames.Add(DatFormat.DOSCenter, CreateOutfileNamesHelper(outDir, ".dc.dat", overwrite));
             }
 
+            // JSON
+            if((DatFormat & DatFormat.Json) != 0)
+            {
+                outfileNames.Add(DatFormat.Json, CreateOutfileNamesHelper(outDir, ".json", overwrite));
+            }
+
             // Logiqx XML
             if ((DatFormat & DatFormat.Logiqx) != 0)
             {
diff --git a/SabreTools.Library/DatFiles/DatHeader.cs b/SabreTools.Library/DatFiles/DatHeader.cs
index 5486d67c..62bcfae8 100644
--- a/SabreTools.Library/DatFiles/DatHeader.cs
+++ b/SabreTools.Library/DatFiles/DatHeader.cs
@@ -1,6 +1,7 @@
 using System;
 
 using SabreTools.Library.Data;
+using Newtonsoft.Json;
 
 namespace SabreTools.Library.DatFiles
 {
@@ -16,121 +17,145 @@ namespace SabreTools.Library.DatFiles
         /// <summary>
         /// External name of the DAT
         /// </summary>
+        [JsonProperty("filename")]
         public string FileName { get; set; }
 
         /// <summary>
         /// Internal name of the DAT
         /// </summary>
+        [JsonProperty("name")]
         public string Name { get; set; }
 
         /// <summary>
         /// DAT description
         /// </summary>
+        [JsonProperty("description")]
         public string Description { get; set; }
 
         /// <summary>
         /// Root directory for the files; currently TruRip/EmuARC-exclusive
         /// </summary>
+        [JsonProperty("rootdir")]
         public string RootDir { get; set; }
 
         /// <summary>
         /// General category of items found in the DAT
         /// </summary>
+        [JsonProperty("category")]
         public string Category { get; set; }
 
         /// <summary>
         /// Version of the DAT
         /// </summary>
+        [JsonProperty("version")]
         public string Version { get; set; }
 
         /// <summary>
         /// Creation or modification date
         /// </summary>
+        [JsonProperty("date")]
         public string Date { get; set; }
 
         /// <summary>
         /// List of authors who contributed to the DAT
         /// </summary>
+        [JsonProperty("author")]
         public string Author { get; set; }
 
         /// <summary>
         /// Email address for DAT author(s)
         /// </summary>
+        [JsonProperty("email")]
         public string Email { get; set; }
 
         /// <summary>
         /// Author or distribution homepage name
         /// </summary>
+        [JsonProperty("homepage")]
         public string Homepage { get; set; }
 
         /// <summary>
         /// Author or distribution URL
         /// </summary>
+        [JsonProperty("url")]
         public string Url { get; set; }
 
         /// <summary>
         /// Any comment that does not already fit an existing field
         /// </summary>
+        [JsonProperty("comment")]
         public string Comment { get; set; }
 
         /// <summary>
         /// Header skipper to be used when loading the DAT
         /// </summary>
+        [JsonProperty("header")]
         public string Header { get; set; }
 
         /// <summary>
         /// Classification of the DAT. Generally only used for SuperDAT
         /// </summary>
+        [JsonProperty("type")]
         public string Type { get; set; }
 
         /// <summary>
         /// Force a merging style when loaded
         /// </summary>
+        [JsonProperty("forcemerging")]
         public ForceMerging ForceMerging { get; set; }
 
         /// <summary>
         /// Force nodump handling when loaded
         /// </summary>
+        [JsonProperty("forcenodump")]
         public ForceNodump ForceNodump { get; set; }
 
         /// <summary>
         /// Force output packing when loaded
         /// </summary>
+        [JsonProperty("forcepacking")]
         public ForcePacking ForcePacking { get; set; }
 
         /// <summary>
         /// Read or write format
         /// </summary>
+        [JsonIgnore]
         public DatFormat DatFormat { get; set; }
 
         /// <summary>
         /// List of fields in machine and items to exclude from writing
         /// </summary>
+        [JsonIgnore]
         public bool[] ExcludeFields { get; set; } = new bool[Enum.GetNames(typeof(Field)).Length];
 
         /// <summary>
         /// Enable "One Rom, One Region (1G1R)" mode
         /// </summary>
+        [JsonIgnore]
         public bool OneRom { get; set; }
 
         /// <summary>
         /// Keep machines that don't contain any items
         /// </summary>
+        [JsonIgnore]
         public bool KeepEmptyGames { get; set; }
 
         /// <summary>
         /// Remove scene dates from the beginning of machine names
         /// </summary>
+        [JsonIgnore]
         public bool SceneDateStrip { get; set; }
 
         /// <summary>
         /// Deduplicate items using the given method
         /// </summary>
+        [JsonIgnore]
         public DedupeType DedupeRoms { get; set; }
 
         /// <summary>
         /// Strip hash types from items
         /// </summary>
+        [JsonIgnore]
         public Hash StripHash { get; private set; }
 
         #endregion
@@ -140,41 +165,49 @@ namespace SabreTools.Library.DatFiles
         /// <summary>
         /// Text to prepend to all outputted lines
         /// </summary>
+        [JsonIgnore]
         public string Prefix { get; set; }
 
         /// <summary>
         /// Text to append to all outputted lines
         /// </summary>
+        [JsonIgnore]
         public string Postfix { get; set; }
 
         /// <summary>
         /// Add a new extension to all items
         /// </summary>
+        [JsonIgnore]
         public string AddExtension { get; set; }
 
         /// <summary>
         /// Replace all item extensions
         /// </summary>
+        [JsonIgnore]
         public string ReplaceExtension { get; set; }
 
         /// <summary>
         /// Remove all item extensions
         /// </summary>
+        [JsonIgnore]
         public bool RemoveExtension { get; set; }
 
         /// <summary>
         /// Romba output mode
         /// </summary>
+        [JsonIgnore]
         public bool Romba { get; set; }
 
         /// <summary>
         /// Output the machine name
         /// </summary>
+        [JsonIgnore]
         public bool GameName { get; set; }
 
         /// <summary>
         /// Wrap quotes around the entire line, sans prefix and postfix
         /// </summary>
+        [JsonIgnore]
         public bool Quotes { get; set; }
 
         #endregion
@@ -184,6 +217,7 @@ namespace SabreTools.Library.DatFiles
         /// <summary>
         /// Output the item name
         /// </summary>
+        [JsonIgnore]
         public bool UseRomName { get; set; }
 
         #endregion
diff --git a/SabreTools.Library/DatFiles/Json.cs b/SabreTools.Library/DatFiles/Json.cs
new file mode 100644
index 00000000..899e79cb
--- /dev/null
+++ b/SabreTools.Library/DatFiles/Json.cs
@@ -0,0 +1,775 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+using SabreTools.Library.Data;
+using SabreTools.Library.DatItems;
+using SabreTools.Library.Tools;
+using NaturalSort;
+using Newtonsoft.Json;
+
+namespace SabreTools.Library.DatFiles
+{
+    /// <summary>
+    /// Represents parsing and writing of a JSON DAT
+    /// </summary>
+    internal class Json : DatFile
+    {
+        /// <summary>
+        /// Constructor designed for casting a base DatFile
+        /// </summary>
+        /// <param name="datFile">Parent DatFile to copy from</param>
+        public Json(DatFile datFile)
+            : base(datFile, cloneHeader: false)
+        {
+        }
+
+        /// <summary>
+        /// Create and open an output file for writing direct from a dictionary
+        /// </summary>
+        /// <param name="outfile">Name of the file to write to</param>
+        /// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
+        /// <returns>True if the DAT was written correctly, false otherwise</returns>
+        public override bool WriteToFile(string outfile, bool ignoreblanks = false)
+        {
+            try
+            {
+                Globals.Logger.User($"Opening file for writing: {outfile}");
+                FileStream fs = Utilities.TryCreate(outfile);
+
+                // If we get back null for some reason, just log and return
+                if (fs == null)
+                {
+                    Globals.Logger.Warning($"File '{outfile}' could not be created for writing! Please check to see if the file is writable");
+                    return false;
+                }
+
+                StreamWriter sw = new StreamWriter(fs, new UTF8Encoding(false));
+                JsonTextWriter jtw = new JsonTextWriter(sw);
+                jtw.Formatting = Formatting.Indented;
+                jtw.IndentChar = '\t';
+                jtw.Indentation = 1;
+
+                // Write out the header
+                WriteHeader(jtw);
+
+                // Write out each of the machines and roms
+                string lastgame = null;
+
+                // Get a properly sorted set of keys
+                List<string> keys = Keys;
+                keys.Sort(new NaturalComparer());
+
+                foreach (string key in keys)
+                {
+                    List<DatItem> roms = this[key];
+
+                    // Resolve the names in the block
+                    roms = DatItem.ResolveNames(roms);
+
+                    for (int index = 0; index < roms.Count; index++)
+                    {
+                        DatItem rom = roms[index];
+
+                        // There are apparently times when a null rom can skip by, skip them
+                        if (rom.Name == null || rom.MachineName == null)
+                        {
+                            Globals.Logger.Warning("Null rom found!");
+                            continue;
+                        }
+
+                        // If we have a different game and we're not at the start of the list, output the end of last item
+                        if (lastgame != null && lastgame.ToLowerInvariant() != rom.MachineName.ToLowerInvariant())
+                            WriteEndGame(jtw);
+
+                        // If we have a new game, output the beginning of the new item
+                        if (lastgame == null || lastgame.ToLowerInvariant() != rom.MachineName.ToLowerInvariant())
+                            WriteStartGame(jtw, rom);
+
+                        // If we have a "null" game (created by DATFromDir or something similar), log it to file
+                        if (rom.ItemType == ItemType.Rom
+                            && ((Rom)rom).Size == -1
+                            && ((Rom)rom).CRC == "null")
+                        {
+                            Globals.Logger.Verbose($"Empty folder found: {rom.MachineName}");
+
+                            rom.Name = (rom.Name == "null" ? "-" : rom.Name);
+                            ((Rom)rom).Size = Constants.SizeZero;
+                            ((Rom)rom).CRC = ((Rom)rom).CRC == "null" ? Constants.CRCZero : null;
+                            ((Rom)rom).MD5 = ((Rom)rom).MD5 == "null" ? Constants.MD5Zero : null;
+                            ((Rom)rom).RIPEMD160 = ((Rom)rom).RIPEMD160 == "null" ? Constants.RIPEMD160Zero : null;
+                            ((Rom)rom).SHA1 = ((Rom)rom).SHA1 == "null" ? Constants.SHA1Zero : null;
+                            ((Rom)rom).SHA256 = ((Rom)rom).SHA256 == "null" ? Constants.SHA256Zero : null;
+                            ((Rom)rom).SHA384 = ((Rom)rom).SHA384 == "null" ? Constants.SHA384Zero : null;
+                            ((Rom)rom).SHA512 = ((Rom)rom).SHA512 == "null" ? Constants.SHA512Zero : null;
+                        }
+
+                        // Now, output the rom data
+                        WriteDatItem(jtw, rom, ignoreblanks);
+
+                        // Set the new data to compare against
+                        lastgame = rom.MachineName;
+                    }
+                }
+
+                // Write the file footer out
+                WriteFooter(jtw);
+
+                Globals.Logger.Verbose("File written!" + Environment.NewLine);
+                jtw.Close();
+                fs.Dispose();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Write out DAT header using the supplied StreamWriter
+        /// </summary>
+        /// <param name="jtw">JsonTextWriter to output to</param>
+        /// <returns>True if the data was written, false on error</returns>
+        private bool WriteHeader(JsonTextWriter jtw)
+        {
+            try
+            {
+                jtw.WriteStartObject();
+
+                jtw.WritePropertyName("header");
+                jtw.WriteStartObject();
+
+                jtw.WritePropertyName("name");
+                jtw.WriteValue(Name);
+                jtw.WritePropertyName("description");
+                jtw.WriteValue(Description);
+                if (!string.IsNullOrWhiteSpace(RootDir))
+                {
+                    jtw.WritePropertyName("rootdir");
+                    jtw.WriteValue(RootDir);
+                }
+                if (!string.IsNullOrWhiteSpace(Category))
+                {
+                    jtw.WritePropertyName("category");
+                    jtw.WriteValue(Category);
+                }
+                jtw.WritePropertyName("version");
+                jtw.WriteValue(Version);
+                if (!string.IsNullOrWhiteSpace(Date))
+                {
+                    jtw.WritePropertyName("date");
+                    jtw.WriteValue(Date);
+                }
+                jtw.WritePropertyName("author");
+                jtw.WriteValue(Author);
+                if (!string.IsNullOrWhiteSpace(Email))
+                {
+                    jtw.WritePropertyName("email");
+                    jtw.WriteValue(Email);
+                }
+                if (!string.IsNullOrWhiteSpace(Homepage))
+                {
+                    jtw.WritePropertyName("homepage");
+                    jtw.WriteValue(Homepage);
+                }
+                if (!string.IsNullOrWhiteSpace(Url))
+                {
+                    jtw.WritePropertyName("date");
+                    jtw.WriteValue(Url);
+                }
+                if (!string.IsNullOrWhiteSpace(Comment))
+                {
+                    jtw.WritePropertyName("comment");
+                    jtw.WriteValue(Comment);
+                }
+                if (!string.IsNullOrWhiteSpace(Type))
+                {
+                    jtw.WritePropertyName("type");
+                    jtw.WriteValue(Type);
+                }
+                if (ForceMerging != ForceMerging.None)
+                {
+                    jtw.WritePropertyName("forcemerging");
+                    switch (ForceMerging)
+                    {
+                        case ForceMerging.Full:
+                            jtw.WriteValue("full");
+                            break;
+                        case ForceMerging.Split:
+                            jtw.WriteValue("split");
+                            break;
+                        case ForceMerging.Merged:
+                            jtw.WriteValue("merged");
+                            break;
+                        case ForceMerging.NonMerged:
+                            jtw.WriteValue("nonmerged");
+                            break;
+                    }
+                }
+                if (ForcePacking != ForcePacking.None)
+                {
+                    jtw.WritePropertyName("forcepacking");
+                    switch (ForcePacking)
+                    {
+                        case ForcePacking.Unzip:
+                            jtw.WriteValue("unzip");
+                            break;
+                        case ForcePacking.Zip:
+                            jtw.WriteValue("zip");
+                            break;
+                    }
+                }
+                if (ForceNodump != ForceNodump.None)
+                {
+                    jtw.WritePropertyName("forcenodump");
+                    switch (ForceNodump)
+                    {
+                        case ForceNodump.Ignore:
+                            jtw.WriteValue("ignore");
+                            break;
+                        case ForceNodump.Obsolete:
+                            jtw.WriteValue("obsolete");
+                            break;
+                        case ForceNodump.Required:
+                            jtw.WriteValue("required");
+                            break;
+                    }
+                }
+                if (!string.IsNullOrWhiteSpace(Header))
+                {
+                    jtw.WritePropertyName("header");
+                    jtw.WriteValue(Header);
+                }
+
+                // End header
+                jtw.WriteEndObject();
+
+                jtw.WritePropertyName("machines");
+                jtw.WriteStartArray();
+
+                jtw.Flush();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Write out Game start using the supplied StreamWriter
+        /// </summary>
+        /// <param name="jtw">JsonTextWriter to output to</param>
+        /// <param name="datItem">DatItem object to be output</param>
+        /// <returns>True if the data was written, false on error</returns>
+        private bool WriteStartGame(JsonTextWriter jtw, DatItem datItem)
+        {
+            try
+            {
+                // No game should start with a path separator
+                datItem.MachineName = datItem.MachineName.TrimStart(Path.DirectorySeparatorChar);
+
+                // Build the state based on excluded fields
+                jtw.WriteStartObject();
+
+                jtw.WritePropertyName("name");
+                jtw.WriteValue(datItem.GetField(Field.MachineName, ExcludeFields));
+
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Comment, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("comment");
+                    jtw.WriteValue(datItem.Comment);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Description, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("description");
+                    jtw.WriteValue(datItem.MachineDescription);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Year, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("year");
+                    jtw.WriteValue(datItem.Year);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Manufacturer, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("manufacturer");
+                    jtw.WriteValue(datItem.Manufacturer);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Publisher, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("publisher");
+                    jtw.WriteValue(datItem.Publisher);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.RomOf, ExcludeFields)) && !string.Equals(datItem.MachineName, datItem.RomOf, StringComparison.OrdinalIgnoreCase))
+                {
+                    jtw.WritePropertyName("romof");
+                    jtw.WriteValue(datItem.RomOf);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.CloneOf, ExcludeFields)) && !string.Equals(datItem.MachineName, datItem.CloneOf, StringComparison.OrdinalIgnoreCase))
+                {
+                    jtw.WritePropertyName("cloneof");
+                    jtw.WriteValue(datItem.CloneOf);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.SampleOf, ExcludeFields)) && !string.Equals(datItem.MachineName, datItem.SampleOf, StringComparison.OrdinalIgnoreCase))
+                {
+                    jtw.WritePropertyName("sampleof");
+                    jtw.WriteValue(datItem.SampleOf);
+                }
+                if (!ExcludeFields[(int)Field.Supported] && datItem.Supported != null)
+                {
+                    if (datItem.Supported == true)
+                    {
+                        jtw.WritePropertyName("supported");
+                        jtw.WriteValue("yes");
+                    }
+                    else if (datItem.Supported == false)
+                    {
+                        jtw.WritePropertyName("supported");
+                        jtw.WriteValue("no");
+                    }
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.SourceFile, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("sourcefile");
+                    jtw.WriteValue(datItem.SourceFile);
+                }
+                if (!ExcludeFields[(int)Field.Runnable] && datItem.Runnable != null)
+                {
+                    if (datItem.Runnable == true)
+                    {
+                        jtw.WritePropertyName("runnable");
+                        jtw.WriteValue("yes");
+                    }
+                    else if (datItem.Runnable == false)
+                    {
+                        jtw.WritePropertyName("runnable");
+                        jtw.WriteValue("no");
+                    }
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Board, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("board");
+                    jtw.WriteValue(datItem.Board);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.RebuildTo, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("rebuildto");
+                    jtw.WriteValue(datItem.RebuildTo);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Devices, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("devices");
+                    jtw.WriteStartArray();
+                    foreach (string device in datItem.Devices)
+                    {
+                        jtw.WriteValue(device);
+                    }
+
+                    jtw.WriteEndArray();
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.SlotOptions, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("slotoptions");
+                    jtw.WriteStartArray();
+                    foreach (string slotoption in datItem.SlotOptions)
+                    {
+                        jtw.WriteValue(slotoption);
+                    }
+
+                    jtw.WriteEndArray();
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Infos, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("infos");
+                    jtw.WriteStartArray();
+                    foreach (var info in datItem.Infos)
+                    {
+                        jtw.WriteStartObject();
+                        jtw.WritePropertyName(info.Key);
+                        jtw.WriteValue(info.Value);
+                        jtw.WriteEndObject();
+                    }
+
+                    jtw.WriteEndArray();
+                }
+                if (!ExcludeFields[(int)Field.MachineType])
+                {
+                    if ((datItem.MachineType & MachineType.Bios) != 0)
+                    {
+                        jtw.WritePropertyName("isbios");
+                        jtw.WriteValue("yes");
+                    }
+                    if ((datItem.MachineType & MachineType.Device) != 0)
+                    {
+                        jtw.WritePropertyName("isdevice");
+                        jtw.WriteValue("yes");
+                    }
+                    if ((datItem.MachineType & MachineType.Mechanical) != 0)
+                    {
+                        jtw.WritePropertyName("ismechanical");
+                        jtw.WriteValue("yes");
+                    }
+                }
+
+                jtw.WritePropertyName("items");
+                jtw.WriteStartArray();
+
+                jtw.Flush();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Write out Game end using the supplied StreamWriter
+        /// </summary>
+        /// <param name="jtw">JsonTextWriter to output to</param>
+        /// <returns>True if the data was written, false on error</returns>
+        private bool WriteEndGame(JsonTextWriter jtw)
+        {
+            try
+            {
+                // End items
+                jtw.WriteEndArray();
+
+                // End machine
+                jtw.WriteEndObject();
+
+                jtw.Flush();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Write out DatItem using the supplied StreamWriter
+        /// </summary>
+        /// <param name="jtw">JsonTextWriter to output to</param>
+        /// <param name="datItem">DatItem object to be output</param>
+        /// <param name="ignoreblanks">True if blank roms should be skipped on output, false otherwise (default)</param>
+        /// <returns>True if the data was written, false on error</returns>
+        private bool WriteDatItem(JsonTextWriter jtw, DatItem datItem, bool ignoreblanks = false)
+        {
+            // If we are in ignore blanks mode AND we have a blank (0-size) rom, skip
+            if (ignoreblanks && (datItem.ItemType == ItemType.Rom && ((datItem as Rom).Size == 0 || (datItem as Rom).Size == -1)))
+                return true;
+
+            // If we have the blank item type somehow, skip
+            if (datItem.ItemType == ItemType.Blank)
+                return true;
+
+            try
+            {
+                // Pre-process the item name
+                ProcessItemName(datItem, true);
+
+                // Build the state based on excluded fields
+                jtw.WriteStartObject();
+                jtw.WritePropertyName("type");
+
+                switch (datItem.ItemType)
+                {
+                    case ItemType.Archive:
+                        jtw.WriteValue("archive");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(datItem.GetField(Field.Name, ExcludeFields));
+                        break;
+
+                    case ItemType.BiosSet:
+                        var biosSet = datItem as BiosSet;
+                        jtw.WriteValue("biosset");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(biosSet.GetField(Field.Name, ExcludeFields));
+                        if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.BiosDescription, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("description");
+                            jtw.WriteValue(biosSet.Description);
+                        }
+                        if (!ExcludeFields[(int)Field.Default] && biosSet.Default != null)
+                        {
+                            jtw.WritePropertyName("default");
+                            jtw.WriteValue(biosSet.Default);
+                        }
+                        break;
+
+                    case ItemType.Disk:
+                        var disk = datItem as Disk;
+                        jtw.WriteValue("disk");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(disk.GetField(Field.Name, ExcludeFields));
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.MD5, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("md5");
+                            jtw.WriteValue(disk.MD5.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.MD5, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("ripemd160");
+                            jtw.WriteValue(disk.RIPEMD160.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.SHA1, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha1");
+                            jtw.WriteValue(disk.SHA1.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.SHA256, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha256");
+                            jtw.WriteValue(disk.SHA256.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.SHA384, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha384");
+                            jtw.WriteValue(disk.SHA384.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.SHA512, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha512");
+                            jtw.WriteValue(disk.SHA512.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.Merge, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("merge");
+                            jtw.WriteValue(disk.MergeTag);
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.Region, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("region");
+                            jtw.WriteValue(disk.Region);
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.Index, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("index");
+                            jtw.WriteValue(disk.Index);
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.Writable, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("writable");
+                            jtw.WriteValue(disk.Writable);
+                        }
+                        if (!ExcludeFields[(int)Field.Status] && disk.ItemStatus != ItemStatus.None)
+                        {
+                            jtw.WritePropertyName("status");
+                            jtw.WriteValue(disk.ItemStatus.ToString().ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(disk.GetField(Field.Optional, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("optional");
+                            jtw.WriteValue(disk.Optional);
+                        }
+                        break;
+
+                    case ItemType.Release:
+                        var release = datItem as Release;
+                        jtw.WriteValue("release");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(release.GetField(Field.Name, ExcludeFields));
+                        if (!string.IsNullOrWhiteSpace(release.GetField(Field.Region, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("region");
+                            jtw.WriteValue(release.Region);
+                        }
+                        if (!string.IsNullOrWhiteSpace(release.GetField(Field.Language, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("language");
+                            jtw.WriteValue(release.Language);
+                        }
+                        if (!string.IsNullOrWhiteSpace(release.GetField(Field.Date, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("date");
+                            jtw.WriteValue(release.Date);
+                        }
+                        if (!ExcludeFields[(int)Field.Default] && release.Default != null)
+                        {
+                            jtw.WritePropertyName("default");
+                            jtw.WriteValue(release.Default);
+                        }
+                        break;
+
+                    case ItemType.Rom:
+                        var rom = datItem as Rom;
+                        jtw.WriteValue("rom");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(rom.GetField(Field.Name, ExcludeFields));
+                        if (!ExcludeFields[(int)Field.Size] && rom.Size != -1)
+                        {
+                            jtw.WritePropertyName("size");
+                            jtw.WriteValue(rom.Size);
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Offset, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("offset");
+                            jtw.WriteValue(rom.Offset);
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.CRC, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("crc");
+                            jtw.WriteValue(rom.CRC.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.MD5, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("md5");
+                            jtw.WriteValue(rom.MD5.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.MD5, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("ripemd160");
+                            jtw.WriteValue(rom.RIPEMD160.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.SHA1, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha1");
+                            jtw.WriteValue(rom.SHA1.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.SHA256, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha256");
+                            jtw.WriteValue(rom.SHA256.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.SHA384, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha384");
+                            jtw.WriteValue(rom.SHA384.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.SHA512, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("sha512");
+                            jtw.WriteValue(rom.SHA512.ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Bios, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("bios");
+                            jtw.WriteValue(rom.Bios);
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Merge, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("merge");
+                            jtw.WriteValue(rom.MergeTag);
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Region, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("region");
+                            jtw.WriteValue(rom.Region);
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Date, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("date");
+                            jtw.WriteValue(rom.Date);
+                        }
+                        if (!ExcludeFields[(int)Field.Status] && rom.ItemStatus != ItemStatus.None)
+                        {
+                            jtw.WritePropertyName("status");
+                            jtw.WriteValue(rom.ItemStatus.ToString().ToLowerInvariant());
+                        }
+                        if (!string.IsNullOrWhiteSpace(rom.GetField(Field.Optional, ExcludeFields)))
+                        {
+                            jtw.WritePropertyName("optional");
+                            jtw.WriteValue(rom.Optional);
+                        }
+                        break;
+
+                    case ItemType.Sample:
+                        jtw.WriteValue("sample");
+                        jtw.WritePropertyName("name");
+                        jtw.WriteValue(datItem.GetField(Field.Name, ExcludeFields));
+                        break;
+                }
+
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.PartName, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("partname");
+                    jtw.WriteValue(datItem.PartName);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.PartInterface, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("partinterface");
+                    jtw.WriteValue(datItem.PartInterface);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.Features, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("features");
+                    jtw.WriteStartArray();
+                    foreach (var feature in datItem.Features)
+                    {
+                        jtw.WriteStartObject();
+                        jtw.WritePropertyName(feature.Key);
+                        jtw.WriteValue(feature.Value);
+                        jtw.WriteEndObject();
+                    }
+
+                    jtw.WriteEndArray();
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.AreaName, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("areaname");
+                    jtw.WriteValue(datItem.AreaName);
+                }
+                if (!string.IsNullOrWhiteSpace(datItem.GetField(Field.AreaSize, ExcludeFields)))
+                {
+                    jtw.WritePropertyName("areasize");
+                    jtw.WriteValue(datItem.AreaSize);
+                }
+
+                // End item
+                jtw.WriteEndObject();
+
+                jtw.Flush();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Write out DAT footer using the supplied StreamWriter
+        /// </summary>
+        /// <param name="jtw">JsonTextWriter to output to</param>
+        /// <returns>True if the data was written, false on error</returns>
+        private bool WriteFooter(JsonTextWriter jtw)
+        {
+            try
+            {
+                // End items
+                jtw.WriteEndArray();
+
+                // End machine
+                jtw.WriteEndObject();
+
+                // End machines
+                jtw.WriteEndArray();
+
+                // End file
+                jtw.WriteEndObject();
+
+                jtw.Flush();
+            }
+            catch (Exception ex)
+            {
+                Globals.Logger.Error(ex.ToString());
+                return false;
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/SabreTools.Library/Data/Flags.cs b/SabreTools.Library/Data/Flags.cs
index af24b63c..394284f7 100644
--- a/SabreTools.Library/Data/Flags.cs
+++ b/SabreTools.Library/Data/Flags.cs
@@ -336,6 +336,11 @@ namespace SabreTools.Library.Data
         /// </summary>
         EverdriveSMDB =         1 << 16,
 
+        /// <summary>
+        /// JSON
+        /// </summary>
+        Json =                  1 << 17,
+
         #endregion
 
         #region SFV-similar Formats
@@ -343,42 +348,40 @@ namespace SabreTools.Library.Data
         /// <summary>
         /// CRC32 hash list
         /// </summary>
-        RedumpSFV =             1 << 17,
+        RedumpSFV =             1 << 18,
 
         /// <summary>
         /// MD5 hash list
         /// </summary>
-        RedumpMD5 =             1 << 18,
+        RedumpMD5 =             1 << 19,
 
         /// <summary>
         /// RIPEMD160 hash list
         /// </summary>
-        RedumpRIPEMD160 =       1 << 19,
+        RedumpRIPEMD160 =       1 << 20,
 
         /// <summary>
         /// SHA-1 hash list
         /// </summary>
-        RedumpSHA1 =            1 << 20,
+        RedumpSHA1 =            1 << 21,
 
         /// <summary>
         /// SHA-256 hash list
         /// </summary>
-        RedumpSHA256 =          1 << 21,
+        RedumpSHA256 =          1 << 22,
 
         /// <summary>
         /// SHA-384 hash list
         /// </summary>
-        RedumpSHA384 =          1 << 22,
+        RedumpSHA384 =          1 << 23,
 
         /// <summary>
         /// SHA-512 hash list
         /// </summary>
-        RedumpSHA512 =          1 << 23,
+        RedumpSHA512 =          1 << 24,
 
         #endregion
 
-        // TODO: Add JSON output. Just for kicks
-
         // Specialty combinations
         ALL = Int32.MaxValue,
     }
diff --git a/SabreTools.Library/README.1ST b/SabreTools.Library/README.1ST
index edfbc936..23762409 100644
--- a/SabreTools.Library/README.1ST
+++ b/SabreTools.Library/README.1ST
@@ -219,6 +219,7 @@ Options:
 		  cmp, clrmamepro	- ClrMamePro
 		  csv				- Standardized Comma-Separated Value
 		  dc, doscenter		- DOSCenter
+		  json				- JSON
 		  lr, listrom		- MAME Listrom
 		  lx, listxml		- MAME Listxml
 		  miss, missfile	- GoodTools Missfile
@@ -757,6 +758,7 @@ Options:
 		  cmp, clrmamepro	- ClrMamePro
 		  csv				- Standardized Comma-Separated Value
 		  dc, doscenter		- DOSCenter
+		  json				- JSON
 		  lr, listrom		- MAME Listrom
 		  lx, listxml		- MAME Listxml
 		  miss, missfile	- GoodTools Missfile
@@ -931,6 +933,7 @@ Options:
 		  cmp, clrmamepro	- ClrMamePro
 		  csv				- Standardized Comma-Separated Value
 		  dc, doscenter		- DOSCenter
+		  json				- JSON
 		  lr, listrom		- MAME Listrom
 		  lx, listxml		- MAME Listxml
 		  miss, missfile	- GoodTools Missfile
diff --git a/SabreTools.Library/Tools/Utilities.cs b/SabreTools.Library/Tools/Utilities.cs
index 71d105cc..a0c961a0 100644
--- a/SabreTools.Library/Tools/Utilities.cs
+++ b/SabreTools.Library/Tools/Utilities.cs
@@ -619,6 +619,9 @@ namespace SabreTools.Library.Tools
                 case DatFormat.EverdriveSMDB:
                     return new EverdriveSMDB(baseDat);
 
+                case DatFormat.Json:
+                    return new Json(baseDat);
+
                 case DatFormat.Listrom:
                     return new Listrom(baseDat);
 
@@ -763,6 +766,8 @@ namespace SabreTools.Library.Tools
                 case "dc":
                 case "doscenter":
                     return DatFormat.DOSCenter;
+                case "json":
+                    return DatFormat.Json;
                 case "lr":
                 case "listrom":
                     return DatFormat.Listrom;
@@ -1271,6 +1276,8 @@ namespace SabreTools.Library.Tools
             {
                 case "csv":
                     return DatFormat.CSV;
+                case "json":
+                    return DatFormat.Json;
                 case "md5":
                     return DatFormat.RedumpMD5;
                 case "ripemd160":
diff --git a/SabreTools/SabreTools.Help.cs b/SabreTools/SabreTools.Help.cs
index 007c3fe1..b33e3e33 100644
--- a/SabreTools/SabreTools.Help.cs
+++ b/SabreTools/SabreTools.Help.cs
@@ -1710,6 +1710,7 @@ Possible values are:
     cmp, clrmamepro  - ClrMamePro
     csv              - Standardized Comma-Separated Value
     dc, doscenter    - DOSCenter
+    json             - JSON
     lr, listrom      - MAME Listrom
     lx, listxml      - MAME Listxml
     miss, missfile   - GoodTools Missfile