JSON Validator

Validate JSON syntax with clear, human-friendly error messages.

Fast processing • Browser-based • Easy copy and download

Workspace

Paste data, upload a file, and produce clean output instantly.

Input

Output

Processed Locally

Your file never leaves your device. Everything is processed in your browser — we never see or store your data.

Frequently Asked Questions

JSON Formatter

Beautify JSON with stable indentation and optional key sorting.

JSON Minifier

Minify JSON by removing whitespace while preserving valid structure.

JSON Repair / Fix Common Errors

Repair common JSON issues (comments, trailing commas, single quotes) best-effort and validate the result.