[CI Skip] 0.31.1

2018-10-10 08:05:35 +00:00
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+
+[![polkadotjs](https://img.shields.io/badge/polkadot-js-orange.svg?style=flat-square)](https://polkadot.js.org) ![isc](https://img.shields.io/badge/license-ISC-lightgrey.svg?style=flat-square) [![style](https://img.shields.io/badge/code%20style-semistandard-lightgrey.svg?style=flat-square)](https://github.com/Flet/semistandard) [![npm](https://img.shields.io/npm/v/@polkadot/api.svg?style=flat-square)](https://www.npmjs.com/package/@polkadot/api) [![travis](https://img.shields.io/travis/polkadot-js/api.svg?style=flat-square)](https://travis-ci.org/polkadot-js/api) [![maintainability](https://img.shields.io/codeclimate/maintainability/polkadot-js/api.svg?style=flat-square)](https://codeclimate.com/github/polkadot-js/api/maintainability) [![coverage](https://img.shields.io/coveralls/polkadot-js/api.svg?style=flat-square)](https://coveralls.io/github/polkadot-js/api?branch=master) [![dependency](https://david-dm.org/polkadot-js/api.svg?style=flat-square&path=package/rpc-core)](https://david-dm.org/polkadot-js/api?path=package/rpc-core) [![devDependency](https://david-dm.org/polkadot-js/api/dev-status.svg?style=flat-square&path=package/rpc-core)](https://david-dm.org/polkadot-js/api?path=package/rpc-core#info=devDependencies)
+
+@polkadot/api
+=============
+
+This library provides a clean wrapper around all the methods exposed by a Polkadot network client.
+
+Usage
+-----
+
+Installation -
+
+```
+npm install --save @polkadot/rpc-core
+```
+
+Initialisation -
+
+```js
+import Api from '@polkadot/rpc-core';
+import WsProvider from '@polkadot/rpc-provider/ws';
+
+const provider = new WsProvider('http://127.0.0.1:9944');
+const api = new Api(provider);
+```
+
+Making calls -
+
+```js
+api.chain
+  .getHeader('0x1234567890')
+  .then((header) => console.log(header))
+  .catch((error) => console.error(error));
+```
+
+Retrieving the best block (once-off) -
+
+```js
+api.chain
+  .getHead()
+  .then((headerHash) => {
+    return api.chain.getHeader(headerHash);
+  })
+  .then((header) => {
+    console.log(`best #${header.number.toString()}`);
+  })
+  .catch((error) => {
+    console.error('error:', error);
+  });
+```
+
+Retrieving best header via subscription -
+
+```js
+api.chain
+  .newHead((error, header) => {
+    if (error) {
+      console.error('error:', error);
+    }
+
+    console.log(`best #${header.number.toString()}`);
+  })
+  .then((subscriptionId) => {
+    // id for the subscription, can unsubscribe via
+    // api.chain.newHead.unsubscribe(subscriptionId)
+  })
+  .catch((error) => {
+    console.error('error subscribing:', error);
+  });
+```
+