JSON Formatter & Validator

Format, validate and explore JSON — entirely in your browser.

No data leaves your browser.

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Input JSON

Formatted Output

Frequently Asked Questions

Is my data safe?: Yes. All processing happens in your browser. Your JSON never leaves your device.
What JSON standard is supported?: RFC 8259 (standard JSON). Comments and trailing commas (JSON5) are not supported.
Is there a size limit?: There is no hard limit. Very large files (>10 MB) may slow down depending on your device.