FormattersTrending

JSON Formatter

Format, validate, and minify JSON data with syntax highlighting

Input JSON

1L|0C|0.0KB

Indent:

Sort keys Strip key quotes Compact arrays Word wrap

About

Formats JSON with syntax highlighting using colored keys, strings, numbers, and booleans, plus line numbers for easy reference. Supports configurable indentation, key sorting, full-text search with navigation arrows to jump between matches, auto-format on paste, and displays input statistics (character count, line count, key count, depth).

Reading raw JSON from APIs or logs is painful without syntax highlighting and line numbers. This tool makes JSON instantly readable with search and navigation, and the auto-format paste feature eliminates the extra step of hitting a Format button.

Who should use this tool?

API developers reading JSON responses, data analysts exploring JSON datasets, and developers debugging JSON configuration files.

Common use cases

Paste a minified API response and have it auto-format with colored syntax highlighting
Search for a specific key or value in a large JSON document with navigation between matches
Check the depth of a nested JSON structure using the input stats (depth, key count, etc.)
Format JSON with sorted keys and line numbers for code review in a pull request
Troubleshoot a malformed JSON configuration by pasting it and seeing the auto-format correction

How to Use

Paste JSON into the input area; auto-format on paste instantly beautifies it with highlighting

Adjust indent size (2 or 4 spaces) and toggle key sorting on or off

Use the search bar to type a key or value; matching lines are highlighted with navigation arrows

View input stats: character count, line count, key count, and maximum nesting depth

Toggle line numbers on/off and copy the formatted output

Invalid JSON shows a parse error with line number and character position for debugging

Examples

Input: '{"users":[{"name":"Alice"}]}' pasted with auto-format. Output: Colored, indented JSON showing 'users' as a key (purple), 'Alice' as a string (green), line numbers 1-4.

Input: Search for 'email' in a 500-line JSON document. Output: 12 matches highlighted with prev/next navigation arrows.

Best Practices

Enable auto-format on paste to save time; it eliminates the extra Format button click
Use search with navigation for large JSON files instead of scrolling manually
Check the depth stat to understand how nested a JSON structure is before writing traversal code
Use sorted keys to quickly locate keys in alphabetical order within the formatted output

Common Mistakes

Pasting invalid JSON and not noticing the parse error message below the input area
Using the tool for JSON larger than 50MB, which may cause browser slowdowns
Searching for a value without quotes when the search expects exact string matching
Confusing line numbers in the formatted output with actual file line numbers (they match)

FAQ

What syntax highlighting colors are used? Keys are typically blue/purple, strings green, numbers orange, booleans red, brackets gray.

Does auto-format work for partial or invalid JSON? It attempts to format valid portions and highlights the error location.

Can I copy only a selection of the formatted JSON? Use the copy all button; for partial copy, select text manually.

What does the depth stat mean? It shows the maximum nesting level of objects/arrays in the JSON.

Related Tools

Same Category — Formatters

SQL Formatter

Format and beautify SQL queries with syntax validation

JavaScript Minifier/Beautifier

Minify, beautify, and validate JavaScript code with customizable options

HTML Formatter/Validator

Format, validate, and minify HTML code online free

CSS Formatter/Minifier

Format, beautify, and minify CSS code online free

Popular Tools

Base64 Encoder/Decoder

Encode and decode Base64 strings online free

JWT Decoder

Decode and analyze JWT tokens online free

URL Encoder/Decoder

Encode and decode URLs and URL components online free

Learning Resources

Dive deeper with our comprehensive guides and tutorials.

JSON Formatter - Beginner's Guide

5 min read

JSON Formatter Advanced Techniques

8 min read

About

Who should use this tool?

API developers reading JSON responses, data analysts exploring JSON datasets, and developers debugging JSON configuration files.

Common use cases

Paste a minified API response and have it auto-format with colored syntax highlighting
Search for a specific key or value in a large JSON document with navigation between matches
Check the depth of a nested JSON structure using the input stats (depth, key count, etc.)
Format JSON with sorted keys and line numbers for code review in a pull request
Troubleshoot a malformed JSON configuration by pasting it and seeing the auto-format correction

How to Use

Paste JSON into the input area; auto-format on paste instantly beautifies it with highlighting

Adjust indent size (2 or 4 spaces) and toggle key sorting on or off

Use the search bar to type a key or value; matching lines are highlighted with navigation arrows

View input stats: character count, line count, key count, and maximum nesting depth

Toggle line numbers on/off and copy the formatted output

Invalid JSON shows a parse error with line number and character position for debugging

Best Practices

Enable auto-format on paste to save time; it eliminates the extra Format button click

Use search with navigation for large JSON files instead of scrolling manually

Check the depth stat to understand how nested a JSON structure is before writing traversal code

Use sorted keys to quickly locate keys in alphabetical order within the formatted output

Common Mistakes

Pasting invalid JSON and not noticing the parse error message below the input area

Using the tool for JSON larger than 50MB, which may cause browser slowdowns

Searching for a value without quotes when the search expects exact string matching

Confusing line numbers in the formatted output with actual file line numbers (they match)

FAQ

What syntax highlighting colors are used? Keys are typically blue/purple, strings green, numbers orange, booleans red, brackets gray.

Does auto-format work for partial or invalid JSON? It attempts to format valid portions and highlights the error location.

Can I copy only a selection of the formatted JSON? Use the copy all button; for partial copy, select text manually.

What does the depth stat mean? It shows the maximum nesting level of objects/arrays in the JSON.

JSON Formatter

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Formatters

SQL Formatter

JavaScript Minifier/Beautifier

HTML Formatter/Validator

CSS Formatter/Minifier

Popular Tools

Base64 Encoder/Decoder

JWT Decoder

URL Encoder/Decoder

Learning Resources

Share

JSON Formatter

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Formatters

SQL Formatter

JavaScript Minifier/Beautifier

HTML Formatter/Validator

CSS Formatter/Minifier

Popular Tools

Base64 Encoder/Decoder

JWT Decoder

URL Encoder/Decoder

Learning Resources

Share