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JSON Formatter & Validator

Format, beautify, validate, or minify JSON. Auto-fix common syntax errors. 100% client-side — nothing leaves your browser.

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Input
0 chars

Paste raw, minified, or malformed JSON. The tool will format and validate it.

Output

Formatted or minified output with validation status.

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Frequently Asked Questions

A JSON formatter takes raw or minified JSON and adds proper indentation and line breaks to make it human-readable. It also validates the structure and reports any syntax errors with their location in the document.

The tool detects missing or extra commas, mismatched brackets or braces, unquoted property names, single quotes instead of double quotes, trailing commas (not valid in strict JSON), and unterminated strings. The "Fix & format" mode can automatically correct many of these.

Format (beautify) adds indentation and newlines to make JSON readable. Minify removes all unnecessary whitespace to produce the smallest possible output, ideal for APIs and configuration files where file size matters.