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    21.0.1-rc2 • Public • Published


    Build Status npm version License: MIT npm

    Javascript API for integration with EOSIO-based blockchains using EOSIO RPC API.

    Documentation can be found here



    The official distribution package can be found at npm.

    NodeJS Dependency

    yarn add eosjs

    Using with Typescript

    In order to get access to the TextEncoding and TextDecoding types, you need to add @types/text-encoding as a dev dependency: yarn add --dev @types/text-encoding

    If you're using Node (not a browser) then you'll also need to make sure the dom lib is referenced in your tsconfig.json:

    	"compilerOptions": {
    		"lib": [..., "dom"]

    Browser Distribution

    Clone this repository locally then run yarn build-web. The browser distribution will be located in dist-web and can be directly copied into your project repository. The dist-web folder contains minified bundles ready for production, along with source mapped versions of the library for debugging. For full browser usage examples, see the documentation.


    ES Modules

    Importing using ES6 module syntax in the browser is supported if you have a transpiler, such as Babel.

    import { Api, JsonRpc, RpcError } from 'eosjs';
    import { JsSignatureProvider } from 'eosjs/dist/eosjs-jssig';           // development only


    Importing using commonJS syntax is supported by NodeJS out of the box.

    const { Api, JsonRpc, RpcError } = require('eosjs');
    const { JsSignatureProvider } = require('eosjs/dist/eosjs-jssig');      // development only
    const fetch = require('node-fetch');                                    // node only; not needed in browsers
    const { TextEncoder, TextDecoder } = require('util');                   // node only; native TextEncoder/Decoder

    Basic Usage

    Signature Provider

    The Signature Provider holds private keys and is responsible for signing transactions.

    Using the JsSignatureProvider in the browser is not secure and should only be used for development purposes. Use a secure vault outside of the context of the webpage to ensure security when signing transactions in production

    const defaultPrivateKey = "5JtUScZK2XEp3g9gh7F8bwtPTRAkASmNrrftmx4AxDKD5K4zDnr"; // bob
    const signatureProvider = new JsSignatureProvider([defaultPrivateKey]);


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

    const rpc = new JsonRpc('', { fetch });


    Include textDecoder and textEncoder when using in Node. You may exclude these when running in a browser since most modern browsers now natively support these. If your browser does not support these (, then you can import them as a dependency through the following deprecated npm package:

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

    Sending a transaction

    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.

    (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: '',
      }, {
        blocksBehind: 3,
        expireSeconds: 30,

    Error handling

    use RpcError for handling RPC Errors

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


    Contributing Guide

    Code of Conduct




    See LICENSE for copyright and license terms.

    All repositories and other materials are provided subject to the terms of this IMPORTANT notice and you must familiarize yourself with its terms. The notice contains important information, limitations and restrictions relating to our software, publications, trademarks, third-party resources, and forward-looking statements. By accessing any of our repositories and other materials, you accept and agree to the terms of the notice.




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