Wondering what’s next for npm?Check out our public roadmap! »


    1.2.0 • Public • Published


    • Client and server.
    • Support websocket and http.
    • Full support for JSON-RPC 2.0 (including auto-incrementing request IDs)

    Originally created by jershell / QuickResto. (original Github repo)

    Some updates written by Privex Inc. (Privex's simple-jsonrpc fork repo)

    Browser Quickstart

    For usage in browsers, you can quickly add it to your web application from Privex's CDN - which hosts both the latest Git version (master) of the library, along with official tagged release versions for safe production use.

    <script src="https://cdn.privex.io/lib/simple-jsonrpc/master/simple-jsonrpc-js.min.js"></script>
        // Create a Simple-JsonRPC object which can call HTTP JSON-RPC queries against the remote server https://rpc.example.com
        var jrpc = simple_jsonrpc.connect_xhr('https://rpc.example.com');
        // Equivelent to: {"jsonrpc":"2.0","method":"get_account","id":1,"params":["johndoe"]}
        jrpc.call('get_account', ['johndoe']).then(function(res) {
            console.log("User ID:", res.id);
            console.log("User Email:", res.email);
            console.log("User Name:", res.full_name);
        // Equivelent to: {"jsonrpc":"2.0","method":"find_posts","id":2,"params":{"tag":"python","author":"jane.doe"}}
        jrpc.call('find_posts', {tag: 'python', author: 'jane.doe'}).then(function(posts) {
            for (var p of posts) {
                console.log("Post title:", p.title)
                console.log("Post tags:", p.tags)
                console.log("Post content:", p.content)
        // Equivelent to: {"jsonrpc":"2.0","method":"status","id":3}
        jrpc.call('status').then(function(status) {

    For safe production usage, you should use a versioned release of the library, with asset integrity attributes like so:

    <script src="https://cdn.privex.io/lib/simple-jsonrpc/1.0.0/simple-jsonrpc-js.min.js" 

    Privex's CDN regularly publishes integrity hashes for the JS and CSS files they host, along with script/link tags with the integrity attributes pre-configured for easy copy pasting: https://cdn.privex.io/integrity.txt (CTRL-F for simple-jsonrpc)


    You can install this package either with

    Bower - for HTML web clients

    bower install simple-jsonrpc-js

    NPM or Yarn - for NodeJS applications

    # Installing simple-jsonrpc-js with Yarn (https://yarnpkg.com/)
    yarn install simple-jsonrpc-js
    # If you don't have / don't want to use Yarn, you can install using NPM normally
    npm install simple-jsonrpc-js

    Building production JS

    # Install the 'gulp' tool globally
    npm install -g gulp-cli
    git clone https://github.com/jershell/simple-jsonrpc-js.git
    cd simple-jsonrpc-js
    # Install NodeJS dependencies
    yarn install   # or npm install
    # Compile simple-jsonrpc-js.js into dist/simple-jsonrpc-js.min.js
    yarn build     # or npm build   ||  or just 'gulp compress'


    (over WebSocket) on server:

    function add(x, y){
        return x + y;
    //over ws
    var WebSocketServer = new require('ws');
    var JsonRPC = require('simple-jsonrpc-js');
    var webSocketServer = new WebSocketServer.Server({
        host: '',
        port: 8090
    }).on('connection', function(ws) {
        var jrpc = new JsonRPC();
        ws.jrpc = jrpc;
        ws.jrpc.toStream = function(message){
        ws.on('message', function(message) {
        jrpc.on('add', ['x', 'y'], add);
        jrpc.on('mul', ['x', 'y'], function(x, y){
            return x*y;
        var item_id = 120;
        jrpc.on('create', ['item', 'rewrite'], function(item, rewrite){
            item_id ++;
            item.id = item_id;
            return item;
        jrpc.call('view.setTitle', ["JSONRPC over ws"]);

    And on client:

            var jrpc = new simple_jsonrpc();
            var socket = new WebSocket("ws://localhost:8090");
            //wait of call
            jrpc.on('view.setTitle', function(title){
                document.getElementsByClassName('title')[0].innerHTML = title;
            socket.onmessage = function(event) {
            jrpc.toStream = function(_msg){
            socket.onerror = function(error) {
                console.error("Error: " + error.message);
            socket.onclose = function(event) {
                if (event.wasClean) {
                    console.info('Connection close was clean');
                } else {
                    console.error('Connection suddenly close');
                console.info('close code : ' + event.code + ' reason: ' + event.reason);
            //after connect
            socket.onopen = function(){
                jrpc.call('add', [2, 3]).then(function (result) {
                    document.getElementsByClassName('paragraph')[0].innerHTML += 'add(2, 3) result: ' + result + '<br>';
                jrpc.call('mul', {y: 3, x: 2}).then(function (result) {
                    document.getElementsByClassName('paragraph')[0].innerHTML += 'mul(2, 3) result: ' + result + '<br>';
                    {call:{method: "add", params: [5,2]}},
                    {call:{method: "mul", params: [100, 200]}},
                    {call:{method: "create", params: {item: {foo: "bar"}, rewrite: true}}}

    More examples in directory


    call(methodName, params) - Remote method invocation. Returned promise object.

    notification(methodName, params) - Remote method invocation without response object

    batch(calls) - batch invocation. Returned promise object.

    on(methodName, paramsName, handler) - Registration local method for incommig invocation

    off(methodName) - disable method for incommig invocation

    customException(code, message, data) - return exception with implementation-defined server-errors


    messageHandler(rawMessage) - All incoming messages must be passed as a parameter. Returned promise object.

    toStream - The property, a function pointer. It is necessary to determine before use. Will be called for send a message to the remote host


    • NodeJS <= 8.11.4 (if using within a NodeJS app, or compiling) || Latest browser (if using client side)
    • (Optional) promise-polyfill for OLD versions of NodeJS and certain older browsers




    npm i simple-jsonrpc-js

    DownloadsWeekly Downloads






    Unpacked Size

    64.4 kB

    Total Files


    Last publish


    • avatar