eosjs

Important: eosjs is under active development and should be considered beta. Improvements and enhancements may break or remove existing functionality. Be sure to lock your dependencies.

If you are looking for the old version of eosjs you can find it here.

eosjs

Library for talking to an EOSIO RPC API. transact() is used to sign and push transactions onto the blockchain with an optional configuration object parameter. This parameter can override the default value of broadcast: true, and can be used to fill TAPOS fields given blocksBehind and expireSeconds. Given no configuration options, transactions are expected to be unpacked with TAPOS fields (expiration, ref_block_num, ref_block_prefix) and will automatically be broadcast onto the chain.

Running Tests

Automated Test Suite

npm run test or yarn test

Integration Tests

1. npm run build-web or yarn build-web
2. Open test.html in your browser of choice

The integration tests assume that you have a local node for EOS set up at localhost:8000. The test.html file should run through 5 test cases with the final showing an exception on the screen for missing required TAPOS.

Basic Usage

NodeJS

const eosjs = require('eosjs');
const fetch = require('node-fetch');                            // node only; not needed in browsers
const { TextDecoder, TextEncoder } = require('text-encoding');  // node, IE11 and IE Edge Browsers

SignatureProvider

SignatureProvider holds private keys and is responsible for signing transactions

const defaultPrivateKey = "5JtUScZK2XEp3g9gh7F8bwtPTRAkASmNrrftmx4AxDKD5K4zDnr"; // useraaaaaaaa
const signatureProvider = new eosjs.SignatureProvider([defaultPrivateKey]);

JSON-RPC

Open a connection to JSON-RPC, include fetch when on NodeJS

const rpc = new eosjs.Rpc.JsonRpc('http://127.0.0.1:8000', { fetch });

API Constructor

Include textDecoder and textEncoder when using in browser.

const api = new eosjs.Api({ rpc, signatureProvider, textDecoder: new TextDecoder, textEncoder: new TextEncoder });

Sending a transaction

(async () => {
  const result = await api.transact({
    actions: [{
      account: 'eosio.token',
      name: 'transfer',
      authorization: [{
        actor: 'useraaaaaaaa',
        permission: 'active',
      }],
      data: {
        from: 'useraaaaaaaa',
        to: 'useraaaaaaab',
        quantity: '0.0001 SYS',
        memo: '',
      },
    }]
  });
  console.dir(result);
})();

Error handling

use eosjs_jsonrpc.RpcError for handling JSON-RPC Errors

...
try {
  const result = await api.transact({
  ...
} catch (e) {
  console.log('\nCaught exception: ' + e);
  if (e instanceof eosjs_jsonrpc.RpcError)
    console.log(JSON.stringify(e.json, null, 2);
}
...

Browsers

Browser distribution is located in dist

Permalink for eosjs documentation is http://eosio.github.io/eosjs