Json Diff Checker Online – JavaScript JSON Formatting

🧹 Open JSON Formatter Tool

Use Json Diff Checker Online instantly – format, validate, minify, or convert your JSON data.

JavaScript provides a built‑in method JSON.stringify() that can produce pretty‑printed JSON with custom indentation.

Pretty print example

const data = { name: "John", age: 30, city: "New York" };

// Pretty-print with 2 spaces
const prettyJson = JSON.stringify(data, null, 2);
console.log(prettyJson);
/* Output:
{
  "name": "John",
  "age": 30,
  "city": "New York"
}
*/

Minify (remove whitespace)

const minified = JSON.stringify(data);

Read JSON from file (Node.js)

const fs = require('fs');
const data = JSON.parse(fs.readFileSync('data.json', 'utf8'));