To get or fetch data from json file in node js; For this you can use the method readfile() and readfilesync of fs module in node js.
Node js has readFile() and readFileSync() methods, which will help you to read synchronous and asynchronous data from JSON file or any other files.
Node.js is a popular runtime environment for JavaScript that allows developers to write server-side applications using JavaScript. One of the common tasks in a Node.js application is to read data from a JSON file. In this article, you will learn how to get data from a JSON file in Node.js, including the syntax and some examples.
How to Get/Read Data from Json File in Node JS?
Steps to read or get data from json file in node js:
Step 1: Create a JSON file
The first step is to create a JSON file containing the data you want to fetch. You can create the file using any text editor, and save it with a .json extension. Here is an example of a simple JSON file:
{
"name": "John Doe",
"age": 30,
"email": "[email protected]"
}
Step 2: Read the JSON file
To read or get the JSON file into your Node.js application, you can use the built-in fs module, which provides an API for interacting with the file system. The fs module includes a method called readFileSync, which reads the contents of a file synchronously and returns it as a string.
Here is an example code snippet that loads the JSON file:
const fs = require('fs');
const data = fs.readFileSync('data.json', 'utf8');
In this code, you first import the fs module and then call the readFileSync method to read the contents of the data.json file. The second argument to readFileSync is the encoding of the file, which set to utf8 to ensure that the data is returned as a string.
Step 3: Parse the JSON data
To parse the JSON data, you can use the built-in JSON.parse method, which takes a JSON string as input and returns a JavaScript object.
Here is an example code snippet that parses the JSON data:
const jsonData = JSON.parse(data);
In this code, you call the JSON.parse method and pass in the data string that loaded from the file. The result is a JavaScript object that you can now work with in our code.
Step 4: Access the JSON data
Now that you have loaded and parsed the JSON data, and can access it just like any other JavaScript object. Here is an example code snippet that accesses the name property of the JSON data:
console.log(jsonData.name);
This code logs the value of the name property of the JSON data to the console.
Conclusion
By using the built-in “fs” module and the “JSON.parse” function, you can easily read and parse JSON data in Node.js.
