Import JSON file in React
JavascriptJsonReactjsJavascript Problem Overview
I'm new to React and I'm trying to import a JSON DATA
variable from an external file. I'm getting the following error:
> Cannot find module "./customData.json"
Could some one help me? It works if I have my DATA
variable in index.js
but not when it's in an external JSON file.
index.js
import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import customData from './customData.json';
import Profile from './components/profile';
import Hobbies from './components/hobbies';
class App extends Component {
render() {
return (
<div>
<Profile name={this.props.profileData.name}imgUrl={this.props.profileData.imgURL} />
<Hobbies hobbyList={this.props.profileData.hobbyList}/>
</div>
);
}
}
ReactDOM.render(<App profileData={DATA}/>, document.querySelector('.container'));
hobbies.js
import React, {Component} from 'react';
var Hobbies = React.createClass({
render: function(){
var hobbies = this.props.hobbyList.map(function(hobby, index){
return (<li key={index}>{hobby}</li>);
});
return (
<div>
<h5>My hobbies:</h5>
<ul>
{hobbies}
</ul>
</div>
);
}
});
export default Hobbies;
profile.js
import React from 'react';
var Profile = React.createClass({
render: function(){
return (
<div>
<h3>{this.props.name}</h3>
<img src={this.props.imgUrl} />
</div>
)
}
});
export default Profile
customData.json
var DATA = {
name: 'John Smith',
imgURL: 'http://lorempixel.com/100/100/',
hobbyList: ['coding', 'writing', 'skiing']
}
export default DATA
Javascript Solutions
Solution 1 - Javascript
One nice way (without adding a fake .js extension which is for code not for data and configs) is to use json-loader
module. If you have used create-react-app
to scaffold your project, the module is already included, you just need to import your json:
import Profile from './components/profile';
This answer explains more.
Solution 2 - Javascript
This old chestnut...
In short, you should be using require and letting node handle the parsing as part of the require call, not outsourcing it to a 3rd party module. You should also be taking care that your configs are bulletproof, which means you should check the returned data carefully.
But for brevity's sake, consider the following example:
For Example, let's say I have a config file 'admins.json' in the root of my app containing the following:
admins.json
[{ "userName": "tech1337", "passSalted": "xxxxxxxxxxxx"}]
Note the quoted keys, "userName"
, "passSalted"
!
I can do the following and get the data out of the file with ease.
let admins = require('~/app/admins.json');
console.log(admins[0].userName);
Now the data is in and can be used as a regular (or array of) object.
Solution 3 - Javascript
With json-loader
installed, you can use
import customData from '../customData.json';
or also, even more simply
import customData from '../customData';
To install json-loader
npm install --save-dev json-loader
Solution 4 - Javascript
Simplest approach is following
// Save this as someJson.js
const someJson = {
name: 'Name',
age: 20
}
export default someJson
then
import someJson from './someJson'
Solution 5 - Javascript
The solution that worked for me is that:- I moved my data.json file from src to public directory. Then used fetch API to fetch the file
fetch('./data.json').then(response => {
console.log(response);
return response.json();
}).then(data => {
// Work with JSON data here
console.log(data);
}).catch(err => {
// Do something for an error here
console.log("Error Reading data " + err);
});
The problem was that after compiling react app the fetch request looks for the file at URL "http://localhost:3000/data.json" which is actually the public directory of my react app. But unfortunately while compiling react app data.json file is not moved from src to public directory. So we have to explicitly move data.json file from src to public directory.
Solution 6 - Javascript
Please store your JSON file with the .js extension and make sure that your JSON should be in same directory.
Solution 7 - Javascript
// rename the .json file to .js and keep in src folder
Declare the json object as a variable
var customData = {
"key":"value"
};
Export it using module.exports
module.exports = customData;
From the component that needs it, make sure to back out two folders deep
import customData from '../customData';
Solution 8 - Javascript
React 17 created from create-react-app
, importing json just work by default.
import config from './config.json'
Solution 9 - Javascript
try with export default DATA
or module.exports = DATA
Solution 10 - Javascript
there are multiple ways to do this without using any third-party code or libraries (the recommended way).
1st STATIC WAY: create a .json file then import it in your react component example
my file name is "example.json"
{"example" : "my text"}
the example key inside the example.json can be anything just keep in mind to use double quotes to prevent future issues.
How to import in react component
import myJson from "jsonlocation";
and you can use it anywhere like this
myJson.example
now there are a few things to consider. With this method, you are forced to declare your import at the top of the page and cannot dynamically import anything.
Now, what about if we want to dynamically import the JSON data? example a multi-language support website?
2 DYNAMIC WAY
1st declare your JSON file exactly like my example above
but this time we are importing the data differently.
let language = require('./en.json');
this can access the same way.
but wait where is the dynamic load?
here is how to load the JSON dynamically
let language = require(`./${variable}.json`);
now make sure all your JSON files are within the same directory
here you can use the JSON the same way as the first example
myJson.example
what changed? the way we import because it is the only thing we really need.
I hope this helps.
Solution 11 - Javascript
In current react build you simply import and use:
import jsonData from 'path/to/myJson.json'
Solution 12 - Javascript
var langs={
ar_AR:require('./locale/ar_AR.json'),
cs_CZ:require('./locale/cs_CZ.json'),
de_DE:require('./locale/de_DE.json'),
el_GR:require('./locale/el_GR.json'),
en_GB:require('./locale/en_GB.json'),
es_ES:require('./locale/es_ES.json'),
fr_FR:require('./locale/fr_FR.json'),
hu_HU:require('./locale/hu_HU.json')
}
module.exports=langs;
Require it in your module:
let langs=require('./languages');
regards
Solution 13 - Javascript
This worked well in React 16.11.0
// in customData.js
export const customData = {
//json data here
name: 'John Smith',
imgURL: 'http://lorempixel.com/100/100/',
hobbyList: ['coding', 'writing', 'skiing']
}
// in index.js
import { customData } from './customData';
// example usage later in index.js
<p>{customData.name}</p>
Solution 14 - Javascript
Something that worked for me was to simply place the JSON file in the public folder. You can simply import in any js using
brain.loadData("exampleFile.json");
It is as simple as that I guess. Definitely worth a try :D