[javascript] loading json data from local file into React JS

I have a React component and I want to load in my JSON data from a file. The console log currently doesn't work, even though I'm creating the variable data as a global

'use strict';

var React = require('react/addons');

// load in JSON data from file
var data;

var oReq = new XMLHttpRequest();
oReq.onload = reqListener;
oReq.open("get", "data.json", true);
oReq.send();

function reqListener(e) {
    data = JSON.parse(this.responseText);
}
console.log(data);

var List = React.createClass({
  getInitialState: function() {
    return {data: this.props.data};    
  },
  render: function() {
    var listItems = this.state.data.map(function(item) {
        var eachItem = item.works.work;        

        var photo = eachItem.map(function(url) {
            return (
                <td>{url.urls}</td> 
            )
        });
    });
    return <ul>{listItems}</ul>
  }
});

var redBubble = React.createClass({
    render: function() {
      return (
        <div>
          <List data={data}/>          
        </div>
      );
    }
  });

module.exports = redBubble;

Ideally, I would prefer to do it something like this, but it's not working - it tries to add ".js" onto the end of the filename.

var data = require('./data.json');

Any advice on the best way, preferably the "React" way, would be much appreciated!

If you have couple of json files:

import data from 'sample.json';

If you were to dynamically load one of the many json file, you might have to use a fetch instead:

fetch(`${fileName}.json`)
  .then(response => response.json())
  .then(data => console.log(data))

I was trying to do the same thing and this is what worked for me (ES6/ES2015):

import myData from './data.json';

I got the solution from this answer on a react-native thread asking the same thing: https://stackoverflow.com/a/37781882/176002

The simplest and most effective way to make a file available to your component is this:

var data = require('json!./data.json');

Note the json! before the path

You could add your JSON file as an external using webpack config. Then you can load up that json in any of your react modules.

Take a look at this answer

1. install json-loader:

   npm i json-loader --save

2. create data folder in src:

   mkdir data

3. put your file(s) there

4. load your file

   var data = require('json!../data/yourfile.json');

If you want to load the file, as part of your app functionality, then the best approach would be to include and reference to that file.

Another approach is to ask for the file, and load it during runtime. This can be done with the FileAPI. There is also another StackOverflow answer about using it: How to open a local disk file with Javascript?

I will include a slightly modified version for using it in React:

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      data: null
    };
    this.handleFileSelect = this.handleFileSelect.bind(this);
  }

  displayData(content) {
    this.setState({data: content});
  }

  handleFileSelect(evt) {
    let files = evt.target.files;
    if (!files.length) {
      alert('No file select');
      return;
    }
    let file = files[0];
    let that = this;
    let reader = new FileReader();
    reader.onload = function(e) {
      that.displayData(e.target.result);
    };
    reader.readAsText(file);
  }

  render() {
    const data = this.state.data;
    return (
      <div>
        <input type="file" onChange={this.handleFileSelect}/>
        { data && <p> {data} </p> }
      </div>
    );
  }
}

My JSON file name: terrifcalculatordata.json

[
    {
      "id": 1,
      "name": "Vigo",
      "picture": "./static/images/vigo.png",
      "charges": "PKR 100 per excess km"
    },
    {
      "id": 2,
      "name": "Mercedes",
      "picture": "./static/images/Marcedes.jpg",
      "charges": "PKR 200 per excess km"
    },
    {
        "id": 3,
        "name": "Lexus",
        "picture": "./static/images/Lexus.jpg",
        "charges": "PKR 150 per excess km"
      }
]

First , import on top:

import calculatorData from "../static/data/terrifcalculatordata.json";

then after return:

  <div>
  {
    calculatorData.map((calculatedata, index) => {
        return (
            <div key={index}>
                <img
                    src={calculatedata.picture}
                    class="d-block"
                    height="170"
                />
                <p>
                    {calculatedata.charges}
                </p>
            </div>