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AsyncProps for React Router

npm package #rackt on freenode

Co-located data loading for React Router apps. Data is loaded before the new screen renders. It is designed to be both a useful solution for many apps, as well as a reference implementation for integrating data with React Router (stuff like redux, relay, falcor etc).

Docs & Help

For questions and support, please visit our channel on Reactiflux or Stack Overflow. The issue tracker is exclusively for bug reports and feature requests.


Using npm:

$ npm install async-props

Then with a module bundler like webpack, use as you would anything else:

// using an ES6 transpiler, like babel
import AsyncProps from 'async-props'

The UMD build is also available on npmcdn:

<script src=""></script>

You can find the library on window.AsyncProps.


This is pre-release, it's pretty close though. If you are using it then you are a contributor. Please add tests with all pull requests.


import { Router, Route } from 'react-router'
import AsyncProps from 'async-props'
import React from 'react'
import { render } from 'react-dom'

class App extends React.Component {

  // 1. define a `loadProps` static method
  static loadProps(params, cb) {
    cb(null, {
      tacos: [ 'Pollo', 'Carnitas' ]

  render() {
    // 2. access data as props :D
    const tacos = this.props.tacos
    return (
          { => (

// 3. Render `Router` with AsyncProps middleware
  <Router render={(props) => <AsyncProps {...props}/>}>
    <Route path="/" component={App}/>
), el)


import { renderToString } from 'react-dom/server'
import { match, RoutingContext } from 'react-router'
import AsyncProps, { loadPropsOnServer } from 'async-props'

app.get('*', (req, res) => {
  match({ routes, location: req.url }, (err, redirect, renderProps) => {

    // 1. load the props
    loadPropsOnServer(renderProps, (err, asyncProps, scriptTag) => {

      // 2. use `AsyncProps` instead of `RoutingContext` and pass it
      //    `renderProps` and `asyncProps`
      const appHTML = renderToString(
        <AsyncProps {...renderProps} {...asyncProps} />

      // 3. render the script tag into the server markup
      const html = createPage(appHTML, scriptTag)

function createPage(html, scriptTag) {
  return `
    <!doctype html>
      <!-- etc. --->
        <div id="app">${html}</div>

        <!-- its a string -->


Please refer to the example, as it exercises the entire API. Docs will come eventually :)