PlayWithJSON

JSON Formatter & Validator

Multi-Pane & Tree View

Format, beautify, validate, and inspect JSON in interactive tree and raw code panes with multi-panel comparison.

1
Ln 1, Col 1|1 lines|0 chars
Spaces: 2|JSON|UTF-8
1
Ln 1, Col 1|1 lines|0 chars
Spaces: 2|JSON|UTF-8

JSON Formatter & Validator Online

Format, validate, beautify, and inspect JSON online with PlayWithJSON's free JSON formatter. Paste your JSON data into the editor to instantly format it with proper indentation and syntax highlighting.

Our JSON formatter makes complex or minified JSON easier to read, validate JSON syntax, inspect nested objects and arrays, and quickly copy or download the formatted result. It works directly in your browser and keeps your data private.

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Why Use PlayWithJSON?

  • 100% Free to use
  • No data is sent to any server
  • Works offline in your browser
  • Supports large JSON files
  • Fast and easy to use

What Can You Do With Our JSON Formatter?

Format JSON

Beautify JSON with proper indentation and syntax highlighting.

Validate JSON

Check for syntax errors and get instant error messages.

Minify JSON

Remove unnecessary whitespace and minify JSON.

Tree View

Explore nested JSON structures in an interactive tree.

Multi-Pane Editing

Compare and edit multiple JSON documents simultaneously.

Copy & Download

Copy formatted JSON or download it to your device instantly.

How to Format JSON Online

1

Paste your JSON

Paste or type your JSON data into the editor.

2

Click Format

The tool automatically beautifies your JSON with proper indentation.

3

Validate your JSON

Syntax errors are highlighted so you can fix invalid JSON.

4

Copy or download

Copy the result or download the formatted JSON.

JSON Formatting Example

Minified JSON (Before)
{"name":"John","age":30,"skills":["JavaScript","JSON"],"active":true}
Formatted JSON (After)
1{
2 "name": "John",
3 "age": 30,
4 "skills": [
5 "JavaScript",
6 "JSON"
7 ],
8 "active": true
9}

JSON Validator Example

Invalid JSON (With Error)
1{
2 "name": "John",
3 "age": 30,
4}
Error: Unexpected token } in JSON at position 46
Valid JSON (Fixed)
1{
2 "name": "John",
3 "age": 30
4}

Supported JSON Features

Objects and arrays
Syntax validation
Nested structures
Tree view exploration
Large JSON files
Multi-pane comparison
Unicode characters
Copy & download
Comments (via JSON5)
Works on all devices
Auto-detect and fix common issues
100% client-side (private)
Frequently Asked Questions

Frequently Asked Questions

A JSON formatter is a tool that takes raw, compact, or minified JSON text and beautifies it with proper indentation, line breaks, and syntax coloring, making it clean and easy for developers to read and debug.

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