diff --git a/js/package.json b/js/package.json
index 59b75c591..dca0e0e6d 100644
--- a/js/package.json
+++ b/js/package.json
@@ -43,6 +43,7 @@
     "test": "mocha 'src/**/*.spec.js'",
     "test:coverage": "istanbul cover _mocha -- 'src/**/*.spec.js'",
     "test:e2e": "mocha 'src/**/*.e2e.js'",
+    "test:npm": "node test/npmLibrary",
     "prepush": "npm run lint:cached"
   },
   "devDependencies": {
diff --git a/js/test/npmLibrary.js b/js/test/npmLibrary.js
new file mode 100644
index 000000000..63d8f9515
--- /dev/null
+++ b/js/test/npmLibrary.js
@@ -0,0 +1,45 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+try {
+  var Api = require('../.npmjs/library.js').Api;
+  var Abi = require('../.npmjs/library.js').Abi;
+
+  if (typeof Api !== 'function') {
+    throw new Error('No Api');
+  }
+
+  if (typeof Abi !== 'function') {
+    throw new Error('No Abi');
+  }
+
+  var transport = new Api.Transport.Http('http://localhost:8545');
+  var api = new Api(transport);
+
+  api.eth
+    .blockNumber()
+    .then((block) => {
+      console.log('library working fine', '(block #' + block.toFormat() + ')');
+      process.exit(0);
+    })
+    .catch(() => {
+      console.log('library working fine (disconnected)');
+      process.exit(0);
+    });
+} catch (e) {
+  console.error('An error occured:', e.toString().split('\n')[0]);
+  process.exit(1);
+}