diff --git a/types/fastify-jwt/fastify-jwt-tests.ts b/types/fastify-jwt/fastify-jwt-tests.ts
new file mode 100644
index 0000000000..9015990b25
--- /dev/null
+++ b/types/fastify-jwt/fastify-jwt-tests.ts
@@ -0,0 +1,85 @@
+import { IncomingMessage, Server, ServerResponse } from "http";
+import { FastifyInstance, FastifyReply, FastifyRequest } from "fastify-jwt";
+
+const fastify: FastifyInstance<Server, IncomingMessage, ServerResponse> = {
+  jwt: {
+    decode: (token, options) => {
+      return token;
+    },
+    secret: "some-string",
+    sign: (payload, options) => {
+      return JSON.stringify(payload);
+    },
+    verify: (token, options) => {
+      return token;
+    },
+  },
+};
+
+const req: FastifyRequest<IncomingMessage> = {
+  jwtVerify: (_options) => {
+    return req;
+  },
+};
+
+const res: FastifyReply<ServerResponse> = {
+  jwtSign: (_payload, _options, _next) => {
+    return res;
+  },
+};
+
+fastify.jwt.sign({ a: "b" }, {}, (err, token) => {
+  if (err) {
+    throw err;
+  }
+
+  return token;
+});
+
+fastify.jwt.sign("string", { algorithm: "some-algorithm" }, (err, token) => {
+  if (err) {
+    throw err;
+  }
+
+  return token;
+});
+
+fastify.jwt.sign([], {}, (err, token) => {
+  if (err) {
+    throw err;
+  }
+
+  return token;
+});
+
+fastify.jwt.sign(9999, {}, (err, token) => {
+  if (err) {
+    throw err;
+  }
+
+  return token;
+});
+
+fastify.jwt.decode("some-token");
+fastify.jwt.decode("some-token");
+fastify.jwt.secret = "some-secret";
+fastify.jwt.verify("some-token", {}, (err) => {
+  if (err) {
+    throw err;
+  }
+
+  return true;
+});
+
+req.jwtVerify();
+req.jwtVerify({});
+req.jwtVerify({}, () => "string");
+req.jwtVerify(() => "string", () => "string");
+
+res.jwtSign("payload");
+res.jwtSign("payload", {});
+res.jwtSign("payload", {}, () => "string");
+res.jwtSign({ a: "b" }, {}, () => "string");
+res.jwtSign([], {}, () => "string");
+res.jwtSign(9999, {}, () => "string");
+res.jwtSign("payload", () => "string", () => "string");
diff --git a/types/fastify-jwt/index.d.ts b/types/fastify-jwt/index.d.ts
new file mode 100644
index 0000000000..801a135f84
--- /dev/null
+++ b/types/fastify-jwt/index.d.ts
@@ -0,0 +1,26 @@
+// Type definitions for fastify-jwt 0.4
+// Project: https://github.com/fastify/fastify-jwt#readme
+// Definitions by: My Self <https://github.com/jannikkeye>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import { Secret, SignOptions, VerifyOptions, VerifyCallback, SignCallback, DecodeOptions } from 'jsonwebtoken';
+
+export interface FastifyInstance<HttpServer, HttpRequest, HttpResponse> {
+    jwt: jwt;
+}
+
+export interface jwt {
+    sign: (payload: any, options?: SignOptions, callback?: SignCallback) => void;
+    verify: (token: string, options?: VerifyOptions, callback?: VerifyCallback) => void;
+    decode: (token: string, options?: DecodeOptions) => null | { [key: string]: any } | string;
+    secret: Secret;
+}
+
+export interface FastifyRequest<HttpRequest> {
+    jwtVerify: (options?: VerifyOptions | VerifyCallback, next?: VerifyCallback) => Promise<null | { [key: string]: any } | string> | null | { [key: string]: any } | string;
+}
+
+export interface FastifyReply<HttpResponse> {
+    jwtSign: (payload: any, options?: SignOptions | SignCallback, next?: SignCallback) => void;
+}
diff --git a/types/fastify-jwt/tsconfig.json b/types/fastify-jwt/tsconfig.json
new file mode 100644
index 0000000000..a0149e0fe8
--- /dev/null
+++ b/types/fastify-jwt/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": false,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "fastify-jwt-tests.ts"
+    ]
+}
diff --git a/types/fastify-jwt/tslint.json b/types/fastify-jwt/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/fastify-jwt/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }