Here, a user is set in the state of the App component and passed as the user prop to the Account component. The Account component can access the value using props.user. Generally, the JSON data comes from an external source, like an API or a JSON file, but for simplicity here it is added from the state.
No matter how complex or large the JSON object is, it can still be passed using props.
Import json file with the given path and json content is stored to a variable with the name given in import.
map method iterates to iterate data elements.
Create state property to hold employee json file. Inside componentDidMount() callback method, use fetch to access the json local file and read json content and update state property with json content.
Inside render, read state data, and print to the component. We will introduce how to import and decode JSON files in a React application. While working on React applications, we may often need to work with JSON data. This data could be from third-party APIs, external files, or maybe internal files sometimes.
One is by using the json-loader module and adding it to the webpack.config, and the other is by directly importing using json-loader.
After creating our new application in React, we will go to our application directory using this command.
Let’s run our app to check if all dependencies are installed correctly.
We will create a new JSON file in the src folder and add sample JSON data.
module.exports = customData;
So, the new.json will look like below. This fake or temporary JSON data can be created using an online service known as json-generator.
import customData from '../customData';
Once we have installed the json-loader library, we need to add a loader in the webpack.config.
Once we have added JSON loader in loaders, we can import it. When working with json-loader, we need to make sure that we are using the webpack of v2 because it doesn’t work in v1.
We can easily decode the JSON file and display data in the table.
First, we will import the person from the JSON file in App.js.
Once we have imported, we can use the person as an array to get the data from the JSON. So we will create a table that will display id, Name, Age, Company, and Balance.
Our code in App.js will look like below.
As you can see, we easily get the value by using the index and key to get the specific value from the JSON file.
DelftStack articles are written by software geeks like you. If you also would like to contribute to DelftStack by writing paid articles, you can check the write for us page.
When building applications in React, we often need to work with JSON data.This data could come from third party APIs or be read from external files.In this guide, we will work on a code example to load the JSON data from a file and renderit inside a React component.
Say you have a data set in JSON format containing information onfinancial stocks from multiple companies.
Each stock has metadata associatedwith it. Your goal is to read that data from an external file and render it onthe web page in a tabular format, as shown below.
Open your terminal and run these commands to use Create React App to get a sample app running on your machine.
Now, to run the app in the development mode, open http://localhost:3000 in your browser.
You should see the sample app running with a React logo.
Create a file in your project at location src/data.js and add the data below in your data.js file.
stockData is a JSON array containing dummy stock prices of some companies.
Each JSON object inside this array contains four things:.
Using export const allows you to define and initialize variables that can be imported into any React component.
So head to the src/App.js file and remove all the boilerplate code that came with it.
The location of the
The code currently doesn't do anything except return a