Retrieving data from a local json file in react - reactjs

Question

How can i retrieve some data from a local json file i created in my folder? i´m using the following code:
class Intro2 extends Component {
render() {
async function getData() {
const usersData = await fetch("../articles.json");
const users = await usersData.json();
return users;
}
}
This doesn't seem to work for my local json file but if i use a url from git hub users for example its working?
many thanks
The error: main.chunk.js:332 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

Answer 1

You shouldn't be using fetch.
Use import instead. This will ensure webpack doesn't bundle the json file.
But makes it available in the public directory.
const usersData = await import("../articles.json");
Fetch will never work because webpack won't serve your JSON file.
Not unless you put it in a the static or public folder.

Answer 2

I think if you're trying to read from your file system you won't be able to do it, because in at least some browsers, you will need to serve the file via a web server process.
But if you are trying to read from http://localhost:9000/articles.json the issue could be another thing.

Answer 3

Maybe you need the {mode:'no-cors'} param ?
fetch('../static/test.txt', {mode: 'no-cors'})
Else you could simply export it:
export const json = () => ({...})
and then import it to your file:
import {json} from '../json

Answer 4

Assuming the json is in the project's folder structure.
import React from "react";
import ReactDom from "react-dom";
import usersData from "../articles.json";
class Intro2 extends React.Component {
state = {
usersData: { ...usersData },
};
componentDidMount() {
// a place for promises
};
render() {
// where the jsx is rendered
return <div>Renders JSX with state {this.state.usersData.aKey}</div>;
}
};
or with react functional components
// Alternatively, use functional components:
import React from "react";
import usersData from "../articles.json";
function Intro2() {
const [usersData, setUsersData] = React.useState({ ...usersData });
return <div>Renders JSX with state {usersData.aKey}</div>;
}