Middlewares And React Redux Life Cycle

Mar 10, 2016 · 4 min read

What are Middlewares?

Redux Life Cycle w/ And w/o Middlewares

Using Middlewares

npm install — save redux-promise
import React from ‘react’;
import { createStore, applyMiddleware } from ‘redux’;
import rp from ‘redux-promise’; // <------------ MIDDLEWARE
//add middlewares
const createStoreWithMiddleware = applyMiddleware(rp)(createStore);
<Provider store={createStoreWithMiddleware(reducers)}>
<Router history={browserHistory} routes={routes} />
, document.getElementById(‘body’));

How does a Middleware Work?

//redux-promise middleware source codeimport { isFSA } from 'flux-standard-action';

function isPromise(val) {
return val && typeof val.then === 'function';

export default function promiseMiddleware({ dispatch }) {
return next => action => {
if (!isFSA(action)) {
return isPromise(action)
? action.then(dispatch)
: next(action);

return isPromise(action.payload)
? action.payload.then(
result => dispatch({ ...action, payload: result }),
error => dispatch({ ...action, payload: error, error: true })
: next(action);

Learn more:

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Trying to make Web development simple. Former Developer Advocate @Salesforce, VMware (node.js); Engineer @ Yahoo, Zimbra. Twitter: @rajaraodv

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