What is a JSON formatter?

A JSON formatter takes raw, minified, or malformed JSON text and adds proper indentation and line breaks to make it human-readable. It also validates that your JSON has no syntax errors.

How do I validate JSON online?

Paste your JSON into the input box. The formatter instantly highlights syntax errors in red, showing the exact line and character position of the problem.

What is the difference between format and minify?

Formatting adds whitespace and indentation for human readability. Minifying removes all unnecessary whitespace to reduce file size for production use.

Is my JSON data safe when I use this tool?

Yes — all processing happens locally in your browser using JavaScript. Your JSON data is never sent to any server, logged, or stored anywhere.

Can I compare two JSON objects?

Use the Tree view to explore and compare nested JSON structures side by side.

Tools / JSON Formatter

JSON Formatter & Validator

Format, minify, and validate JSON data instantly. Everything runs locally in your browser.

Input JSON

Size: 0 B Keys: 0 Depth: 0

Format, Validate, and Explore JSON

Beautify JSON

Turn minified API responses and config files into readable, indented JSON with 2 spaces, 4 spaces, or tabs.

Catch Syntax Errors

Parse errors appear immediately so missing commas, invalid strings, and malformed objects are easier to fix.

Inspect Structure

Use the tree view to explore nested arrays and objects, plus stats for payload size, key count, and depth.

How to Use the JSON Formatter

Paste raw JSON from an API response, log, or config file into the input panel.
Choose 2 spaces, 4 spaces, or tabs for the formatted output.
Use Code view for copying clean JSON, or Tree view to inspect nested objects and arrays.
Use Minify when you need compact JSON for a request body or configuration value.

Common JSON Validation Errors

Keys and string values must use double quotes, not single quotes.
Trailing commas after the final object property or array item are invalid JSON.
Comments are not allowed in standard JSON. Use JSONC, YAML, or TOML if comments are required.
Every opening brace or bracket needs a matching closing brace or bracket.

Private Browser-Based JSON Formatting

This JSON formatter processes your input in the browser using client-side JavaScript. It is designed for developer workflows where API payloads, configuration files, and debugging data should remain local while you format, validate, inspect, and copy the result.

Frequently Asked Questions

What is a JSON formatter?: A JSON formatter takes raw, minified, or malformed JSON text and adds proper indentation and line breaks to make it human-readable. It also validates that your JSON has no syntax errors.
How do I validate JSON online?: Paste your JSON into the input box. The formatter instantly highlights syntax errors in red, showing the exact line and character position of the problem. Green output means the JSON is valid.
What is the difference between format and minify?: Formatting (pretty print) adds whitespace and indentation for human readability. Minifying removes all unnecessary whitespace to reduce file size — useful for production API payloads and configuration files.
Is my JSON data safe when I use this tool?: Yes — all processing happens locally in your browser using JavaScript. Your JSON data is never sent to any server, logged, or stored anywhere.
Can I compare two JSON objects?: Use the Tree view to explore and compare nested JSON structures. For side-by-side diff comparison, format both JSON objects and use your editor's diff tool.

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