React creates dummy data using Faker.js



Hello everyone it’s me candle. Let’s try to use Faker.js in React.

I think that there are various purposes for using Faker.js.
In many cases you will use it for testing, but this time I’d like to create a dummy react state using Faker.js.


  1. You have a basic react skill
  2. create-react-app was installed

Create new project

First of all, create a react project. Execute the below command in your favorite directory and create a new react project.

create-react-app faker-demo
cd faker-demo

Installation of faker

Install faker with this coommand.

yarn add --dev faker

it’s over.

Generate dummy data with faker

Open src/App.js and write this.

import React, { Component } from 'react'
import Faker from 'faker'

class App extends Component {
  constructor(props) {
    this.state = {
      users: [],

  componentWillMount() {
    for (let i = 0; i < 5; i++) {
      const user = {
        name: Faker.internet.userName(),
        avatar: Faker.internet.avatar(),
      this.setState(prevState => ({
        users: [...prevState.users, user],

  renderUsers(user) {
    return (
      <div style={{ border: 'solid 1px #eee' }}>
        <img src={user.avatar} alt={} width="50" height="50" />
        <h4>Name: {}</h4>
        <h4>Email: {}</h4>

  render() {
    return <div>{ => this.renderUsers(user))}</div>

export default App

The place which generates the dummy data with Faker is componentWillMount() part.

We made users data for five people.

The place where Faker.internet.userName ()or () actually generates dummy data in Faker.

  componentWillMount() {
    for (let i = 0; i < 5; i++) {
      const user = {
        name: Faker.internet.userName(),
        avatar: Faker.internet.avatar(),
      this.setState(prevState => ({
        users: [...prevState.users, user],

Launch the server and check the data is generated or not.

yarn run start

Yes it pretty good.

Another Faker Data

The data provided by Faker is written in “NameSpaces” of the following URL.

You’ll find out a necessary dummy data.


As a way to utilize Faker, even if you do not have an API server, you can write a code only client side using this dummy data.


If you think this article is good, share it please

-, ,



Your email address will not be published. Required fields are marked *


How to change the language form “en-US” to “en” by wordpres bogo

English 日本語 Abstract Hello everyone, It’s me candle. In this time, I will show you to customize bogo plugins. The bogo is wonderful plugin which can adapt the wordpress site to many languages as a simple. but, there is a problem that you can’t choose general English. When writing English articles, you may not always have to write it limited to country. However, you can choose ‘en-UK’, ‘en-CA’ and ‘en-US’, but ‘en’ can not be chosen in bogo. I checked the source code. The bogo got a language list from wordpress function, and there is no general English in it. …

Use react-simple-format in React web

Abstract Hello everyone it’s me candle. In this article we will use simple-format in react. Simple format is famous for Ruby on Rails and is commonly used. React has a legacy react-simple-format and 16g’s made. The legacy lib is not useful, so I choose 16g’s made. Condition Nothing Create project If you already have a React project please use it. If not, use the following command to create it. create-react-app simple_format_sample cd simple_format_sample How to use react-simple-format First install it. yarn add @16g/react-simple-format Open a appropriate component file. I write it in src/App.js. import React, { Component } from …

Using sphinx how to generate documents of python classes and functions

Abstruct Hello everyone it’s me candle. In this article I will explain how to make documents about classes and functions with Sphinx automatically. condition I will explain it using Python 3, but I think that it will probably work with python 2 as well. Prepare test files Create a and touch Write this to the from dog import Dog def main(): dog = Dog() dog.show_name() if __name__ == "__main__": main() Open the and write it. class Dog(object): def __init__(self, name="bob"): = name def bark(): print("Bow Wow") def show_name(self): print( def get_name(self): return …

React Project development environment building command create-react-app is too convenient

English 日本語 Abstract Hello everyone It’s me candle. In this time we will build a “react” development environment with create-react-app command and try to hello world. Past react development was created by installing babel and other packages from npm on your own using gulp or webpack. Past react development installed babel and other packages from npm and built servers with gulp and webpack. If you use the create-react-app command, you can create react environment easily. Let’s do it. Precondition Node is already installed

Lazy load image with react-lazyload

Abstract Hello everyoen it’s me candle. This time let’s make a delayed loading of images with react-lazyload. The problem of SPA is the delay at the time of initial loading. Among them, we feel that the site with many images is even late. Let’s try it. Condition Nothing Prepare If you have already developing react project, use it. But you don’t have yet or try to test. Generate it with this command. create-react-app imageloader-sample cd imageloader-sample We will prepare images for samples with Faker.js, so install it. yarn add faker Ready to develop. Make a sample code Open the src/App.js …

I work in the venture company as a CTO. I start to write program in University, first I learned java, C++ and PHP. In the company, I'm developing web services by Rails. I do like to automation.