ToolNett

How to Use

A complete guide to formatting, validating, and working with JSON.

Quick Start

Paste your JSON into the left panel, click Format, and copy the result. That's it! For more advanced features, continue reading below.

Step-by-Step Guide

1

Input Your JSON

You have three ways to input JSON data:

  • •Paste directly into the left panel
  • •Click 'Upload' to select a .json file from your computer
  • •Click 'URL' to load JSON from a public API endpoint
2

Validate Your JSON

Validation happens automatically as you type (if auto-validate is enabled) or click 'Validate':

  • •Valid JSON shows a green 'Valid JSON' status
  • •Invalid JSON shows a red error with the line number and description
  • •Enable 'Auto-validate' for real-time validation as you type
3

Format or Minify

Transform your JSON with one click:

  • •Click 'Format' to beautify with proper indentation (2 spaces)
  • •Click 'Minify' to compress by removing all whitespace
  • •View the result in the right panel
4

Explore with Tree View

For complex JSON structures, use the tree view:

  • •Toggle 'Tree' in the output panel tabs
  • •Click arrows to expand/collapse nested objects and arrays
  • •See data types and values at a glance
5

Fix Errors (Auto-Repair)

If your JSON has common errors, try the Fix feature:

  • •Click 'Fix' to automatically repair common issues
  • •Handles trailing commas, single quotes, unquoted keys
  • •Converts undefined and NaN to null
6

Export Your JSON

Get your formatted JSON out of the tool:

  • •Click 'Copy' to copy to clipboard
  • •Click 'Download' to save as a .json file
  • •Use the copied/downloaded JSON in your project

Common Use Cases

Debugging API Responses

Copy the JSON response from your browser's network tab, paste it here, and format to easily inspect the data structure.

Validating Config Files

Upload your package.json, tsconfig.json, or any config file to validate syntax before committing changes.

Minifying for Production

Paste formatted JSON and minify to reduce file size for storage or transmission in production environments.

Learning JSON Structure

Use the tree view to explore nested JSON structures visually and understand complex data hierarchies.

Tips & Tricks

Working with Large Files

Our tool handles large JSON files efficiently, but for very large files (10MB+), consider using the minify feature first to reduce processing time.

Keyboard Shortcuts

Use Tab for indentation in the editor. The editor preserves your cursor position when you format or validate.

Loading from APIs

When loading from URL, make sure the endpoint returns raw JSON and allows CORS. Some APIs may require authentication which isn't supported.

Fixing Stubborn Errors

If auto-fix doesn't work, check the error message for the exact line number. Common issues include missing commas, extra commas, and unmatched brackets.

Ready to Start?

Try the JSON Formatter now with our sample data or paste your own.

Open JSON Formatter