Format & Validate JSON
Tree View · Minify · Sort Keys

Format, beautify, minify and validate JSON with tree view, key sorting, error detection, and node statistics.

Input

0 chars

Why Use Our JSON Formatter

Professional JSON handling made easy

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Tree View

Interactive collapsible tree visualization of JSON structure

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Pretty Print

Auto-format with clean indentation for maximum readability

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Minification

Compress JSON to minimal size with savings percentage shown

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Key Sorting

Alphabetically sort all keys for consistent JSON ordering

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Error Detection

Real-time syntax error validation with detailed messages

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Node Statistics

Count total nodes and measure maximum nesting depth

Complete Guide: How to Use the JSON Formatter & Validator

Format, beautify, and validate JSON data online with syntax highlighting and error detection. Whether you're debugging API responses, cleaning up configuration files, or learning JSON structure, this tool makes it easy to read and fix JSON. Everything runs locally in your browser — your data stays private.

Step-by-Step Instructions

1
Paste your JSON
Paste raw or minified JSON into the input area. The tool accepts any valid JSON — objects, arrays, nested structures, and even large payloads.
2
Click Format / Validate
Hit the format button to beautify the JSON with proper indentation and syntax highlighting. Validation errors are shown with line numbers and descriptions.
3
Review the output
The formatted JSON is displayed with color-coded syntax: strings, numbers, booleans, nulls, and keys each get distinct colors for easy reading.
4
Copy or fix errors
Copy the formatted JSON to your clipboard. If there are syntax errors, the validator pinpoints the exact location so you can fix them.

Common Use Cases

✓Debugging API responses — prettify minified JSON to understand the data structure
✓Validating configuration files — catch syntax errors before deployment
✓Code reviews — format JSON for readable diffs and comparisons
✓Learning — understand nested JSON structures with clear indentation
✓Data transformation — clean up JSON before importing into databases or tools
✓Documentation — format JSON examples for API docs and README files

Pro Tips

💡Common JSON errors: trailing commas after the last item, single quotes instead of double quotes, and unquoted keys.

💡JSON doesn't support comments. If you need comments in config files, consider JSON5 or JSONC formats.

💡Use 2-space indentation for compact display or 4-space for maximum readability.

💡For very large JSON files (10MB+), consider using a local tool like jq for better performance.

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Frequently Asked Questions

What does this JSON formatter do?

This tool formats (beautifies) JSON data with proper indentation, minifies JSON by removing whitespace, and validates JSON structure to detect syntax errors.

How do I validate JSON?

Paste your JSON into the input field and click 'Validate'. The tool will tell you if the JSON is valid or show you the specific syntax error.

What's the difference between format and minify?

Formatting adds indentation and newlines to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size — useful for production data.

Can I choose the indentation size?

Yes! You can choose between 2 spaces, 4 spaces, or tab-width (8 spaces) using the dropdown selector.

Format & Validate JSONTree View · Minify · Sort Keys