JSON Formatter & Validator – Beautify JSON Online

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Format, validate, and minify JSON with syntax highlighting and instant error detection. Tree view included. 100% client-side — your data stays private.

JSON Formatter

Beautify, minify and validate JSON instantly

Sort keys

Indentation

JSON input

Beautified

Output

Formatted JSON will appear here

Paste JSON above to begin

What is JSON Formatter?

Beautify or minify JSON with real-time syntax highlighting, error detection (line/column), and tree view. Handles files up to 10 MB. All processing is browser-side.

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JSON Formatter Features

Real-Time Validation

Error messages with exact line and column numbers.

Tree & Code Views

Switch between collapsible tree and raw code.

Syntax Highlighting

Color-coded keys, values, strings, and types.

JSON Formatter FAQ

The tool highlights the exact error location with a message. Common fixes: add missing quotes around keys, remove trailing commas, and escape special characters.

Yes — the parser handles files up to 10 MB without performance issues.