Hi I am using trufflebox boilerplate react-auth-box. Created a new component called Foo where I am trying to access the web3 object that has been mapped from Store to this.props.

However the console.log(this.props.web3) is showing {web3Instance: null}. What should we do?


import React, { Component } from 'react';
import { connect } from 'react-redux';

class Foo extends Component {

    componentWillMount() {
        console.log(this.props.web3)               // {web3Instance: null}

    render() {
        return ( <div>foo</div> )

function mapStateToProps(state) {
    return {
        web3: state.web3

export default connect(mapStateToProps)(Factory);


import React from 'react';
import ReactDOM from 'react-dom';
import { Router, Route, IndexRoute, browserHistory } from 'react-router'
import { Provider } from 'react-redux'
import { syncHistoryWithStore } from 'react-router-redux'
import { UserIsAuthenticated, UserIsNotAuthenticated } from './util/wrappers.js'
import getWeb3 from './util/web3/getWeb3'

// Layouts
import App from './App'
import Home from './layouts/home/Home'
import Dashboard from './layouts/dashboard/Dashboard'
import SignUp from './user/layouts/signup/SignUp'
import Profile from './user/layouts/profile/Profile'
import Foo from './Foo'

// Redux Store
import store from './store'

// Initialize react-router-redux.
const history = syncHistoryWithStore(browserHistory, store)

// Initialize web3 and set in Redux.
.then(results => {
  console.log('Web3 initialized!')
.catch(() => {
  console.log('Error in web3 initialization.')

    <Provider store={store}>
      <Router history={history}>
        <Route path="/" component={App}>
          <IndexRoute component={Home} />
          <Route path="dashboard" component={UserIsAuthenticated(Dashboard)} />
          <Route path="signup" component={UserIsNotAuthenticated(SignUp)} />
          <Route path="profile" component={UserIsAuthenticated(Profile)} />
          <Route path="foo" component={Foo} />

1 Answer 1


Your ReactDOM.render is happening before the getWeb3 is done.

use your store to dispatch an action such as

  type:  WEB3_LOADED,
  payload: results

and add a reducer called web3 that injects the action's payload into the state as web3

const reducer = (state = { web3: null }, action) => {
   switch(action.type) {
      case WEB3_LOADED: return { web3: action.payload }
      default: return state

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