Node JS Read and Write Json File Example

Hi,

This post is focused on node js read and write json file. In this article, we will implement a node js write json to file. This article goes in detailed on node js read json file. you can understand a concept of node js read write json file.

In this tutorial, i will give you very simple example how to read and write json file in node.js project. let's see very simple example here:

Read Json File:

users.json

[
    { 
        "id":1, 
        "name": "Hardik"
    },
    { 
        "id":2, 
        "name": "Paresh"
    },
    { 
        "id":3, 
        "name": "Rakesh"
    },
    { 
        "id":4, 
        "name": "Mahesh"
    }
]

server.js

const fs = require('fs');
    
let rawdata = fs.readFileSync('users.json');
let users = JSON.parse(rawdata);
  
console.log(users);

Output:

[
  { id: 1, name: 'Hardik' },
  { id: 2, name: 'Paresh' },
  { id: 3, name: 'Rakesh' },
  { id: 4, name: 'Mahesh' }
]

Write Json File:

server.js

const fs = require('fs');
  
users = [
    { id:1, name:'Hardik'},
    { id:2, name:'Paresh'},
    { id:3, name:'Rakesh'},
    { id:4, name:'Mahesh'},
  ];
  
let data = JSON.stringify(users);
fs.writeFileSync('users-2.json', data);

Output: users-2.json

[{"id":1,"name":"Hardik"},{"id":2,"name":"Paresh"},{"id":3,"name":"Rakesh"},{"id":4,"name":"Mahesh"}]

i hope it can help you...