diff --git a/Core/CKAN-core.csproj b/Core/CKAN-core.csproj
index 69f7596df7..8858b5b317 100644
--- a/Core/CKAN-core.csproj
+++ b/Core/CKAN-core.csproj
@@ -53,7 +53,11 @@
     <Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <HintPath>..\_build\lib\nuget\Newtonsoft.Json.10.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
+    <Reference Include="NJsonSchema, Version=9.10.6.0, Culture=neutral, PublicKeyToken=c2f9c3bdfae56102, processorArchitecture=MSIL">
+      <HintPath>..\_build\lib\nuget\NJsonSchema.9.10.6\lib\net45\NJsonSchema.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
+    <Reference Include="System.Net" />
     <Reference Include="System.Transactions" />
   </ItemGroup>
   <ItemGroup>
@@ -132,10 +136,12 @@
     <Compile Include="Win32Registry.cs" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="app.config" />
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="builds.json" />
+    <EmbeddedResource Include="CKAN.schema" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Target Name="BeforeBuild">
diff --git a/Core/CKAN.schema b/Core/CKAN.schema
new file mode 100644
index 0000000000..3aab11ee07
--- /dev/null
+++ b/Core/CKAN.schema
@@ -0,0 +1,423 @@
+{
+    "$schema" : "http://json-schema.org/draft-04/schema#",
+    "title" : "CKAN JSON Schema",
+    "description" : "Schema for validating CKAN meta files",
+    "type" : "object",
+    "properties" : {
+        "spec_version" : {
+            "description" : "Version of the CKAN spec this document uses",
+            "oneOf" : [
+                {
+                    "type"        : "integer",
+                    "description" : "The integer '1' is special case",
+                    "minimum"     : 1,
+                    "maximum"     : 1
+                },
+                {
+                    "type"        : "string",
+                    "description" : "A vx.x string",
+                    "pattern"     : "^v[0-9]+\\.[0-9]+$"
+                }
+            ]
+        },
+        "name" : {
+            "description" : "Human readable name of the mod",
+            "type"        : "string"
+        },
+        "identifier" : {
+            "description" : "Unique identifier for this mod.",
+            "$ref"        : "#/definitions/identifier"
+        },
+        "kind" : {
+            "description" : "Package type, defaults to package.",
+            "enum"        : [ "package", "metapackage" ]
+        },
+        "abstract" : {
+            "description" : "Short description of the mod",
+            "type"        : "string"
+        },
+        "description" : {
+            "description" : "Longer description of the mod",
+            "type"        : "string"
+        },
+        "comment" : {
+            "description" : "Free-form comment. Not displayed to users.",
+            "type"        : "string"
+        },
+        "author" : {
+            "description" : "Author, or list of authors.",
+            "oneOf" : [
+                { "type" : "string" },
+                {
+                    "type"        : "array",
+                    "items"       : { "type" : "string" },
+                    "uniqueItems" : true
+                }
+            ]
+        },
+        "download" : {
+            "description" : "URL where mod can be downloaded by tools",
+            "type"        : "string",
+            "format"      : "uri"
+        },
+        "download_size" : {
+            "description" : "The size of the download in bytes",
+            "type"        : "integer"
+        },
+        "download_hash" : {
+            "description" : "A object of hashes of the downloaded file",
+            "type"        : "object",
+            "properties" : {
+                "sha1" : {
+                    "description" : "SHA1 hash of the file",
+                    "type"        : "string"
+                },
+                "sha256" : {
+                    "description" : "SHA256 hash of the file",
+                    "type"        : "string"
+                }
+            }
+        },
+        "download_content_type" : {
+            "description" : "The content type of the download",
+            "type"        : "string"
+        },
+        "license" : {
+            "description" : "Machine readable license, or array of licenses",
+            "$ref"        : "#/definitions/licenses"
+        },
+        "version" : {
+            "description" : "Version of the mod. Drop the leading v",
+            "$ref"        : "#/definitions/version"
+        },
+        "release_status" : {
+            "description" : "Optional release status",
+            "enum"        : [ "stable", "testing", "development" ]
+        },
+        "ksp_version" : {
+            "description" : "Optional target KSP version",
+            "$ref"        : "#/definitions/ksp_version"
+        },
+        "ksp_version_min" : {
+            "description" : "Optional minimum KSP version",
+            "$ref"        : "#/definitions/ksp_version"
+        },
+        "ksp_version_max" : {
+            "description" : "Optional maximum KSP version",
+            "$ref"        : "#/definitions/ksp_version"
+        },
+        "ksp_version_strict" : {
+            "description" : "Optional enforcement of strict version checks (defaults to false)",
+            "type"        : "boolean"
+        },
+        "tags" : {
+            "description" : "A series of descriptive keywords to provide quick filtering and organization",
+            "type"        : "array",
+            "items" : {
+                "type" : "string",
+                "pattern" : "^[a-z0-9-]+$"
+            }
+        },
+        "depends" : {
+            "description" : "Optional list of dependencies",
+            "$ref"        : "#/definitions/relationship"
+        },
+        "recommends" : {
+            "description" : "Optional list of recommended mods",
+            "$ref"        : "#/definitions/relationship"
+        },
+        "suggests" : {
+            "description" : "Optional list of recommended, but not essential mods",
+            "$ref"        : "#/definitions/relationship"
+        },
+        "supports" : {
+            "description" : "Optional list of supported mods",
+            "$ref"        : "#/definitions/relationship"
+        },
+        "conflicts" : {
+            "description" : "Optional list of conflicting mods",
+            "$ref"        : "#/definitions/relationship"
+        },
+        "provides" : {
+            "description" : "A list of virtual packages this mod provides",
+            "type"        : "array",
+            "items"       : { "type" : "string" },
+            "uniqueItems" : true
+        },
+        "resources" : {
+            "description" : "Additional resources",
+            "type" : "object",
+            "properties" : {
+                "homepage" : {
+                    "description" : "Mod homepage",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "bugtracker" : {
+                    "description" : "Mod bugtracker",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "license" : {
+                    "description" : "Mod license",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "repository" : {
+                    "description" : "Mod repository",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "ci" : {
+                    "description" : "Continuous Integration",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "spacedock" : {
+                    "description" : "Project on SpaceDock",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "curse" : {
+                    "description" : "Project on Curse",
+                    "type"        : "string",
+                    "format"      : "uri"
+                },
+                "manual" : {
+                    "description" : "Mod's manual",
+                    "type"        : "string",
+                    "format"      : "uri"
+                }
+            }
+        },
+        "install" : {
+            "description" : "List of install directives",
+            "type" : "array",
+            "items" : {
+                "type" : "object",
+                "properties" : {
+                    "file" : {
+                        "description" : "Path to file to install",
+                        "type"        : "string"
+                    },
+                    "find" : {
+                        "description" : "A directory to find for installation",
+                        "type"        : "string"
+                    },
+                    "find_regexp" : {
+                        "description" : "A regexp that matches the directory to install",
+                        "type"        : "string"
+                    },
+                    "find_matches_files" : {
+                        "description" : "If true, find directives match files as well as directories",
+                        "type"        : "boolean"
+                    },
+                    "install_to" : {
+                        "description" : "Where file should be installed to",
+                        "$ref"        : "#/definitions/install_to"
+                    },
+                    "as": {
+                        "description" : "The name to give the matching directory or file when installed",
+                        "type"        : "string",
+                        "pattern"     : "^[^\\\\/]+$"
+                    },
+                    "filter" : {
+                        "description" : "List of files and directories that should be filtered from the install",
+                        "$ref"        : "#/definitions/one_or_more_strings"
+                    },
+                    "filter_regexp" : {
+                        "description" : "List of regexps that should filter files from this install",
+                        "$ref"        : "#/definitions/one_or_more_strings"
+                    },
+                    "include_only" : {
+                        "description" : "List of files and directories that should not be excluded from the install",
+                        "$ref"        : "#/definitions/one_or_more_strings"
+                    },
+                    "include_only_regexp" : {
+                        "description" : "List of regexps that should include files in this install",
+                        "$ref"        : "#/definitions/one_or_more_strings"
+                    }
+                },
+                "not" : {
+                    "anyOf" : [
+                        {
+                            "required" : [ "filter", "include_only" ]
+                        },
+                        {
+                            "required" : [ "filter", "include_only_regexp" ]
+                        },
+                        {
+                            "required" : [ "filter_regexp", "include_only" ]
+                        },
+                        {
+                            "required" : [ "filter_regexp", "include_only_regexp" ]
+                        }
+                    ]
+                },
+                "required" : [ "install_to" ],
+                "oneOf": [
+                    {
+                        "required": [ "file" ]
+                    },
+                    {
+                        "required": [ "find" ]
+                    },
+                    {
+                        "required": [ "find_regexp" ]
+                    }
+                ]
+            }
+        }
+    },
+    "required" : [
+        "spec_version",
+        "name",
+        "abstract",
+        "identifier",
+        "license",
+        "version"
+    ],
+    "oneOf": [
+        {
+            "required": [ "download" ]
+        },
+        {
+            "properties": {
+                "kind": {
+                    "enum": [ "metapackage" ]
+                }
+            },
+            "not": {
+                "required": [ "download" ]
+            },
+            "required": [ "kind" ]
+        }
+    ],
+    "definitions" : {
+        "identifier" : {
+            "description" : "Unique identifier for this mod.",
+            "type"        : "string",
+            "pattern"     : "^[A-Za-z0-9-]*$"
+        },
+        "version" : {
+            "description" : "A version string",
+            "type"        : "string"
+        },
+        "ksp_version" : {
+            "description" : "A version of KSP",
+            "type"        : "string",
+            "pattern"     : "^(any|[0-9]+\\.[0-9]+(\\.[0-9]+)?)$"
+        },
+        "relationship" : {
+            "description" : "A relationship to a list of mods",
+            "type" : "array",
+            "items" : {
+                "type" : "object",
+                "properties" : {
+                    "name" : {
+                        "description" : "Identifier of the mod",
+                        "$ref"        : "#/definitions/identifier"
+                    },
+                    "version" : {
+                        "description" : "Optional version",
+                        "$ref"        : "#/definitions/version"
+                    },
+                    "min_version" : {
+                        "description" : "Optional minimum version",
+                        "$ref"        : "#/definitions/version"
+                    },
+                    "max_version" : {
+                        "description" : "Optional maximum version",
+                        "$ref"        : "#/definitions/version"
+                    }
+                },
+                "required" : [ "name" ]
+            }
+        },
+        "install_to" : {
+            "description" : "Where file should be installed to. As of v1.2, GameData may take a path",
+            "oneOf" : [
+                {
+                    "description" : "Spec version 1 targets",
+                    "enum"        : [ "GameData", "Ships", "GameRoot", "Tutorial", "Scenarios" ]
+                },
+                {
+                    "description" : "Spec v1.2 GameData path",
+                    "type"        : "string",
+                    "pattern"     : "^GameData/"
+                },
+                {
+                    "description" : "Spec v1.12 Ships subfolder paths",
+                    "type"        : "string",
+                    "pattern"     : "^Ships/(SPH|VAB)$"
+                },
+                {
+                    "description" : "Spec v1.16 thumbs paths",
+                    "type"        : "string",
+                    "pattern"     : "^Ships/@thumbs/(SPH|VAB)$"
+                }
+            ]
+        },
+        "license" : {
+            "description" : "A license.",
+            "enum" : [
+                "public-domain",
+                "AFL-3.0",
+                "AGPL-3.0",
+                "Apache", "Apache-1.0", "Apache-2.0",
+                "APSL-2.0",
+                "Artistic", "Artistic-1.0", "Artistic-2.0",
+                "BSD-2-clause", "BSD-3-clause", "BSD-4-clause",
+                "ISC",
+                "CC-BY", "CC-BY-1.0", "CC-BY-2.0", "CC-BY-2.5", "CC-BY-3.0", "CC-BY-4.0",
+                "CC-BY-SA", "CC-BY-SA-1.0", "CC-BY-SA-2.0", "CC-BY-SA-2.5", "CC-BY-SA-3.0", "CC-BY-SA-4.0",
+                "CC-BY-NC", "CC-BY-NC-1.0", "CC-BY-NC-2.0", "CC-BY-NC-2.5", "CC-BY-NC-3.0", "CC-BY-NC-4.0",
+                "CC-BY-NC-SA", "CC-BY-NC-SA-1.0", "CC-BY-NC-SA-2.0", "CC-BY-NC-SA-2.5", "CC-BY-NC-SA-3.0", "CC-BY-NC-SA-4.0",
+                "CC-BY-NC-ND", "CC-BY-NC-ND-1.0", "CC-BY-NC-ND-2.0", "CC-BY-NC-ND-2.5", "CC-BY-NC-ND-3.0", "CC-BY-NC-ND-4.0",
+                "CC-BY-ND", "CC-BY-ND-1.0", "CC-BY-ND-2.0", "CC-BY-ND-2.5", "CC-BY-ND-3.0", "CC-BY-ND-4.0",
+                "CC0",
+                "CDDL", "CPL",
+                "EFL-1.0", "EFL-2.0",
+                "Expat", "MIT",
+                "GPL-1.0", "GPL-2.0", "GPL-3.0",
+                "LGPL-2.0", "LGPL-2.1", "LGPL-3.0",
+                "GFDL-1.0", "GFDL-1.1", "GFDL-1.2", "GFDL-1.3",
+                "GFDL-NIV-1.0", "GFDL-NIV-1.1", "GFDL-NIV-1.2", "GFDL-NIV-1.3",
+                "LPPL-1.0", "LPPL-1.1", "LPPL-1.2", "LPPL-1.3c",
+                "MPL-1.0", "MPL-1.1",
+                "Ms-PL", "Ms-RL",
+                "Perl",
+                "Python-2.0",
+                "QPL-1.0",
+                "Unlicense",
+                "W3C",
+                "WTFPL",
+                "Zlib",
+                "Zope",
+                "open-source", "restricted", "unrestricted", "unknown"
+            ]
+        },
+        "licenses" : {
+            "description" : "A license, or array of licenses",
+            "anyOf" : [
+                { "$ref" : "#/definitions/license" },
+                {
+                    "type"        : "array",
+                    "items"       : { "$ref" : "#/definitions/license" },
+                    "uniqueItems" : true
+                }
+            ]
+        },
+        "one_or_more_strings" : {
+            "description" : "One or more strings",
+            "oneOf" : [
+                { "type" : "string" },
+                {
+                    "type"        : "array",
+                    "items"       : { "type" : "string" },
+                    "uniqueItems" : true
+                }
+            ]
+        }
+    }
+}
diff --git a/Core/Types/CkanModule.cs b/Core/Types/CkanModule.cs
index 1467286ac0..4c52b7aff8 100644
--- a/Core/Types/CkanModule.cs
+++ b/Core/Types/CkanModule.cs
@@ -2,8 +2,11 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Runtime.Serialization;
 using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using NJsonSchema;
 using Autofac;
 using CKAN.Versioning;
 using log4net;
@@ -292,6 +295,13 @@ public CkanModule(string json, IGameComparator comparator)
         {
             _comparator = comparator;
 
+            var errors = ValidateAgainstSchema(json);
+            if (errors.Result.Any())
+            {
+                var message = "Validation against the schema failed.\n" + string.Join("\n  ", errors);
+                throw new BadMetadataKraken(null, message);
+            }
+
             try
             {
                 // Use the json string to populate our object
@@ -366,6 +376,33 @@ private void DeSerialisationFixes(StreamingContext like_i_could_care)
             name = name ?? string.Empty;
         }
 
+        static CkanModule()
+        {
+            var assembly = Assembly.GetExecutingAssembly();
+            using (var stream = assembly.GetManifestResourceStream(SchemaPath))
+            using (var reader = new StreamReader(stream))
+            {
+                var result = reader.ReadToEnd();
+                MetadataSchema = JsonSchema4.FromSampleJson(result);
+            }
+        }
+
+        private static readonly string SchemaPath = "CKAN.CKAN.schema";
+        private static readonly JsonSchema4 MetadataSchema;
+
+        private static async Task<IList<string>> ValidateAgainstSchema(string json)
+        {
+            JsonSchema4 schema = await JsonSchema4.FromJsonAsync(json);
+
+            IList<string> errorList = new List<string>();
+            var errors = schema.Validate(MetadataSchema.ToJson());
+
+            foreach (var error in errors)
+                errorList.Add(error.ToString());
+
+            return errorList;
+        }
+
         /// <summary>
         /// Tries to parse an identifier in the format Modname=version
         /// If the module cannot be found in the registry, throws a ModuleNotFoundKraken.
diff --git a/Core/app.config b/Core/app.config
new file mode 100644
index 0000000000..dde2c3cc64
--- /dev/null
+++ b/Core/app.config
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-10.0.0.0" newVersion="10.0.0.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>
\ No newline at end of file
diff --git a/Core/packages.config b/Core/packages.config
index aa696112f9..3edeb57499 100644
--- a/Core/packages.config
+++ b/Core/packages.config
@@ -4,5 +4,6 @@
   <package id="ICSharpCode.SharpZipLib.Patched" version="0.86.5.1" targetFramework="net45" />
   <package id="log4net" version="2.0.8" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net45" />
+  <package id="NJsonSchema" version="9.10.6" targetFramework="net45" />
   <package id="TxFileManager" version="1.3" targetFramework="net45" />
 </packages>
\ No newline at end of file