JSON Error Fixer

Automatically fix common JSON errors online. Repair trailing commas, missing quotes, single quotes and other syntax issues. Browser-based — no data sent to servers.

Your data never leaves your browser

JSON Validator

Check if your JSON is valid with detailed error messages

JSON Formatter & Beautifier

Format and validate JSON with syntax highlighting online

JSON Minifier & Compressor

Remove whitespace from JSON to reduce its file size

Frequently Asked Questions

What errors can be fixed?

Trailing commas in objects/arrays, single quotes instead of double quotes, missing quotes on keys, JavaScript-style comments (// and /* */), undefined values and NaN/Infinity numbers.