Format, validate, and minify JSON data with custom indentation and instant error detection.
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JSON Formatter & Beautifier is a free tool on ToolifHub for formatting, validating, and minifying JSON data. Paste in compact or messy JSON and instantly beautify it with your choice of 2-space, 4-space, or tab indentation, or switch to minify mode to strip all whitespace for production use. If your JSON has a syntax error — a trailing comma, a missing bracket, an unquoted key — the tool shows the exact parser error message so you can find and fix the problem quickly. Everything runs locally in your browser, so API responses, config files, and other JSON data never leave your device.
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Debug API responses by formatting compact JSON into a readable structure.
Validate configuration files like package.json or tsconfig.json before committing changes.
Quickly check whether an API response is valid JSON when investigating a bug report.
Minify JSON configuration payloads before deploying to production.
Understand JSON structure by seeing it consistently indented and formatted.
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