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Format, validate, and beautify JSON instantly in your browser. Free online JSON formatter with syntax highlighting and error detection.
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Paste your JSON to instantly format, validate, and beautify it with syntax highlighting. All processing happens locally in your browser — your data never leaves your device.
Yes. Your JSON is processed entirely in your browser using JavaScript. No data is sent to any server.
The tool handles most practical JSON sizes. Very large files (100MB+) may be slow due to browser memory limits.
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