Validate, format or minify JSON while preserving numeric spelling and duplicate keys.
Processed locally · Originals unchanged
Formatting preserves token spelling, large integers, exponents, duplicate keys and negative zero. Validation checks JSON syntax; it does not validate a schema or resolve duplicate-key ambiguity. Maximum pretty-print depth: 100.
Enter data or choose files, process locally, inspect the output, then download. Text input is limited to 2 MiB. This tool does not upload your input or use external processing.
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