diff --git a/ns-api/index.d.ts b/ns-api/index.d.ts
new file mode 100644
index 0000000000..db66f109f3
--- /dev/null
+++ b/ns-api/index.d.ts
@@ -0,0 +1,66 @@
+// Type definitions for ns-api 2.0
+// Project: https://github.com/fvdm/nodejs-ns-api#readme
+// Definitions by: Sander Koenders <https://github.com/Archcry>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = nsApi;
+declare function nsApi(conf: nsApi.Configuration): nsApi;
+
+interface nsApi {
+    /**
+     * Vertrektijden - departure times
+     *
+     * @callback callback
+     * @param station {string} - Station ID
+     * @param callback {function} - `function (err, data) {}`
+     * @returns {void}
+     */
+    vertrektijden(station: string, callback: (err: string, data: {}) => void): void;
+
+    /**
+     * Reisadvies - travel advise
+     *
+     * @callback callback
+     * @param params {object} - Parameters
+     * @param callback {function} - `function (err, data) {}`
+     * @returns {void}
+     */
+    reisadvies(params: {}, callback: (err: string, data: {}) => void): void;
+
+    /**
+     * Prijzen - tariffs
+     *
+     * @callback callback
+     * @param params {object} - Parameters
+     * @param callback {function} - `function (err, data) {}`
+     * @returns {void}
+     */
+    prijzen(params: {}, callback: (err: any, data: {}) => void): void;
+
+    /**
+     * List available stations
+     *
+     * @callback callback
+     * @param [treeKey] {string} - Group by this key
+     * @param callback {function} - `function (err, data) {}`
+     */
+    stations(treeKey: string, callback: (err: string, data: {}) => void): void;
+    stations(callback: (err: string, data: {}) => void): void;
+
+    /**
+     * List disruptions
+     *
+     * @callback callback
+     * @param params {object} - Parameters
+     * @param callback {function} - `function (err, data) {}`
+     */
+    storingen(params: {}, callback: (err: string, data: {}) => void): void;
+}
+
+declare namespace nsApi {
+    interface Configuration {
+        username: string;
+        password: string;
+        timeout?: number;
+    }
+}
diff --git a/ns-api/ns-api-tests.ts b/ns-api/ns-api-tests.ts
new file mode 100644
index 0000000000..8a3b8c5bb6
--- /dev/null
+++ b/ns-api/ns-api-tests.ts
@@ -0,0 +1,56 @@
+import * as NsApi from "ns-api";
+
+let ns: NsApi = NsApi({
+    username: "",
+    password: "",
+    timeout: 1500
+});
+
+ns.vertrektijden("", (err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
+
+// Get travel advise
+ns.reisadvies ({}, (err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
+
+ns.prijzen({}, (err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
+
+ns.stations("code", (err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
+
+ns.stations((err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
+
+ns.storingen({}, (err: any, data: Object) => {
+    if(err) {
+        console.log(err);
+    } else {
+        console.log(data);
+    }
+});
\ No newline at end of file
diff --git a/ns-api/tsconfig.json b/ns-api/tsconfig.json
new file mode 100644
index 0000000000..fae5845b2d
--- /dev/null
+++ b/ns-api/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "ns-api-tests.ts"
+    ]
+}
diff --git a/ns-api/tslint.json b/ns-api/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/ns-api/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }