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ValidateHTML

JSON Formatter & Beautifier

Paste minified or messy JSON and get clean, properly indented output instantly. Also validates your JSON and catches syntax errors.

Ctrl+Enter to validate
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How the JSON Formatter Works

Our JSON formatter takes any input (minified, poorly indented, or inconsistently spaced) and outputs clean, properly formatted JSON with 2-space indentation.

Unlike simple formatters, our tool also validatesyour JSON while formatting it. If your JSON has syntax errors (missing commas, unquoted keys, trailing commas), we'll tell you exactly where the error is, with line number and column, so you can fix it before formatting.

The formatter handles all valid JSON: objects, arrays, nested structures, strings, numbers, booleans, and null values. It preserves your data exactly while making it readable.

Common Use Cases

API Response Debugging

Paste a minified API response to see the structure clearly. Find nested values, check data types, and verify payloads.

Config File Cleanup

Clean up package.json, tsconfig.json, or any configuration file that's become messy after manual edits.

Database Exports

Format JSON exports from MongoDB, Firebase, or other databases for review, documentation, or debugging.

Webhook Payloads

Format incoming webhook payloads from Stripe, GitHub, Slack, or other services to understand their structure.

Frequently Asked Questions

What is a JSON formatter?
A JSON formatter takes raw, minified, or messy JSON data and reformats it with proper indentation and line breaks. This makes the JSON structure visible and easy to read, which is essential for debugging API responses, reviewing config files, and understanding data structures.
Does formatting change my JSON data?
No. Formatting only changes whitespace and indentation. Your data (keys, values, structure) remains exactly the same. The formatted and minified versions are semantically identical.
What indentation does the formatter use?
Our formatter uses 2-space indentation, which is the most common standard for JSON in web development. This matches the output of JSON.stringify(data, null, 2) in JavaScript.
Can I format invalid JSON?
No. JSON must be syntactically valid to be formatted. If your JSON has errors (missing commas, unquoted keys, trailing commas, single quotes), our tool will detect and report the exact error location so you can fix it first.
What is the difference between JSON formatting and JSON validation?
Validation checks whether your JSON follows the correct syntax. Formatting reorganizes already-valid JSON for readability. Our tool does both at once: it validates first, and if the JSON is valid, it returns formatted output. If the JSON is invalid, it points to the exact error location instead of formatting.
Is there a size limit?
There is no strict limit, but very large JSON files (over 1MB) may take a moment to process. For most API responses and config files, formatting is instant.
Is this JSON formatter free?
Yes, completely free with no limits and no registration. Format as much JSON as you need.

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