The 🚀 fastest ⚡️ way for web apps to start talking to servers.
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rrequire logo

why rrequire?

The 🚀 fastest ⚡️ way for web apps to start talking to servers. Connect your frontend to your backend with just 3 lines of code and zero configuration.

Enjoy familiar node module export syntax and ES6 import syntax to make your remote calls.

Warning: This package is still experimental and the API may change in-between patch versions.

Getting Started

Jump To:

Web Client

The rrequire client allows for easy calls from a web browser to a remote server implementing the JSON-RPC protocol (such as the @rrequire/server).

Install from npm:

npm install @rrequire/client

'Import' a remote function for use:

import rrequire from '@rrequire/client';

const { add } = rrequire('server/module');

async function myClientMethod(x) {
  console.log(await add(x, 5));

By default, rrequire will try to send requests to the current host (/, equivalent to location.origin).

All functions return Promises that will resolve to the value that's returned by the remote procedure (or reject if a problem occurs). It's recommended to use the async/await syntax for more concise code.

Note: As of this time, module names are not used to scope function imports.


Import the config function to globally set configs for future RPC requests.

import rrequire, { config } from '@rrequire/client';

config({ remoteLocation: 'http://localhost:8080' });

Config Options

Key Type Default Description
remoteLocation String / URL of the JSON-RPC server.

Advanced Usage: Avoiding ES6 Proxy

The usage of Proxy in production can cause problems for browsers that do not yet support Proxy. The Proxy object is used to magically catch all property references at run time (ex. module.function), allowing for easy ES6-like import syntax and minimal overhead. Since there is no polyfill for Proxy, you must instead explicitly define which functions you expect to import from the remote server.

By passing in an array of function names into the rrequire function call, rrequire avoids using Proxy and creates a static object with all functions pre-defined according to the array.


const {
} = rrequire('server/module', [
    // This array specifies which function names we're importing
    // It should match the above properties


The rrequire server allows for easy definition of remote functions that will be served on a Node server using the JSON-RPC protocol over http.

Install from npm:

npm install @rrequire/server

'Export' a remote function:

function add(x, y) {
  return x + y;


By default, a rrequire server on port 8080 will be started with CORS enabled for any host.

Function Signature: export(Object functionsToExport, Object options)


  }, {
    autoStart: false,

Export Options

Key Type Default Description
autoStart Boolean true If set to false, prevents rrequire from starting its own server. (Useful for using start explicitly or for using rrequire as middleware)

Stand-Alone Configuration

Call the start function before any export function calls to explicitly start the Node server with custom options. Calling start after an export will have no effect.

Calling export alone will automatically start up a server with default options.

const rrequire = require('@rrequire/server')

// ...function definitions here

rrequire.start({ port: 3000, enableCors: true });
  // ... function exports here

Start Options

Key Type Default Description
port Number 3000 Port number to listen to incoming RPC requests.
enableCors Boolean true If true, allows RPC requests from any domain.

Middleware (Use in Existing Apps)

Use rrequire in your current express/connect app by inserting the rrequire server as middleware.

const rrequire = require('@rrequire/server');
const express = require('express');

const app = express();
// ... Your express app
app.all('/rpc', rrequire.middleware({ enableCors: true }));

Middleware Options

Key Type Default Description
end Boolean true If set to false causes the middleware to next() instead of res.end() when finished.
enableCors Boolean true If true, allows requests from any domain.

Further Info

The server largely depends on jayson middleware to handle RPC function registration and invocation.