diff --git a/package.json b/package.json
index 2919d14..e5108e9 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,8 @@
     "mocha": "~1.8.2",
     "rimraf": "~2.1.1",
     "zfill": "0.0.1",
-    "batch": "~0.3.1"
+    "batch": "~0.3.1",
+    "jsonschema": "~1.0.1"
   },
   "dependencies": {
     "buffer-equal": "0.0.0",
diff --git a/protocol/protocol_schema.json b/protocol/protocol_schema.json
new file mode 100644
index 0000000..7cd75fe
--- /dev/null
+++ b/protocol/protocol_schema.json
@@ -0,0 +1,128 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "title": "protocol",
+
+  "definitions": {
+    "directions": {
+      "type": "object",
+      "properties":{
+        "toClient":{"$ref" : "#/definitions/packets"},
+        "toServer":{"$ref" : "#/definitions/packets"}
+      },
+      "required":["toClient","toServer"],
+      "additionalProperties": false
+    },
+    "packets": {
+      "type": "object",
+      "patternProperties": {
+        "^[a-z_]+$": {"$ref" : "#/definitions/packet"}
+      },
+      "additionalProperties": false
+    },
+    "packet": {
+      "type": "object",
+      "properties":{
+        "id": {"$ref" : "#/definitions/id"},
+        "fields": {"$ref" : "#/definitions/fields"}
+      },
+      "required":["id","fields"],
+      "additionalProperties": false
+    },
+    "id": {
+      "type": "string",
+      "pattern": "^0x[0-9a-f]{2}$"
+    },
+    "fields" : {
+      "type": "array",
+      "items": {"$ref" : "#/definitions/field"},
+      "additionalItems": false
+    },
+    "field": {
+      "type": "object",
+      "properties": {
+        "name": {"$ref" : "#/definitions/fieldName"},
+        "type": {"$ref" : "#/definitions/fieldType"},
+        "typeArgs": {"$ref" : "#/definitions/fieldTypeArgs"},
+        "condition": {"$ref" : "#/definitions/fieldCondition"}
+      },
+      "required":["name","type"],
+      "additionalProperties": false
+    },
+    "fieldName": {
+      "type":"string",
+      "pattern": "^[a-zA-Z0-9_]+$"
+    },
+    "fieldType": {
+      "type":"string",
+      "pattern": "^[a-zA-Z]+$"
+    },
+    "fieldTypeArgs": {
+      "type":"object",
+      "properties":{
+        "type": {"$ref" : "#/definitions/fieldType"},
+        "countFor": {"$ref" : "#/definitions/fieldTypeArgsCountFor"},
+        "count": {"$ref" : "#/definitions/fieldTypeArgsCount"},
+        "fields": {"$ref" : "#/definitions/fields"},
+        "typeArgs": {"$ref" : "#/definitions/fieldTypeArgs"}
+      },
+      "additionalProperties": false
+    },
+    "fieldTypeArgsCountFor": {
+      "type":"string",
+      "pattern": "^(this\\.)?[a-zA-Z0-9_]+$"
+    },
+    "fieldTypeArgsCount": {
+      "oneOf": [
+        {"$ref" : "#/definitions/fieldTypeArgsCountFor"},
+        {
+          "type":"object",
+          "properties":{
+            "field":{"$ref" : "#/definitions/fieldName"},
+            "map":{
+              "type":"object",
+              "patternProperties":{
+                "^[0-9]+$":{
+                  "type":"integer"
+                }
+              },
+              "additionalProperties": false
+            },
+            "default":{
+              "type":"integer"
+            }
+          },
+          "required":["field","map","default"],
+          "additionalProperties": false
+        }
+      ]
+    },
+    "fieldCondition": {
+      "type": "object",
+      "properties":{
+        "field": {"$ref" : "#/definitions/fieldName"},
+        "values": {
+          "type": "array",
+          "items": {
+            "type": ["integer","boolean"]
+          },
+          "additionalItems": false,
+          "minItems": 1
+        },
+        "different": {
+          "type": "boolean"
+        },
+        "this": {
+          "type": "boolean"
+        }
+      },
+      "required": ["field","values"],
+      "additionalProperties": false
+    }
+  },
+
+  "type": "object",
+  "patternProperties": {
+    "^[a-z]+$":{"$ref" : "#/definitions/directions"}
+  },
+  "additionalProperties": false
+}
diff --git a/test/validate.js b/test/validate.js
new file mode 100644
index 0000000..7447f9c
--- /dev/null
+++ b/test/validate.js
@@ -0,0 +1,16 @@
+var assert = require('assert');
+
+var Validator = require('jsonschema').Validator;
+var v = new Validator();
+
+Error.stackTraceLimit=0;
+
+describe("protocol schema", function() {
+    this.timeout(60 * 1000);
+    it("protocol.json is valid",function(){
+        var instance = require('../protocol/protocol.json');
+        var schema = require('../protocol/protocol_schema.json');
+        var result = v.validate(instance, schema);
+        assert.strictEqual(result.errors.length,0,require('util').inspect(result.errors,{'depth':4}));
+    });
+});