JSON Repair
Free online JSON repair tool. Fix broken, malformed, and invalid JSON instantly. Automatically repairs missing quotes, trailing commas, single quotes, comments, and other common JSON errors. Perfect for fixing LLM-generated JSON. Local browser processing means no signup, no upload.
Frequently Asked Questions
What types of JSON errors can this tool fix?
The tool fixes missing quotes around keys, trailing commas, single quotes instead of double quotes, JavaScript-style comments, Python constants like None/True/False, unescaped special characters, missing closing brackets, and many other common JSON formatting issues.
Can it fix JSON generated by AI models like ChatGPT?
Yes, this tool is specifically designed to handle JSON output from large language models which often contains formatting quirks like trailing commas, single quotes, or unquoted keys. Simply paste the malformed JSON and the tool will repair it automatically.
What happens if the JSON is too damaged to repair?
If the tool cannot fully repair the JSON, it will show an error message explaining what went wrong. In most cases, even severely malformed JSON can be at least partially repaired, and you can manually fix any remaining issues based on the error feedback.
Is JSON Repair free, and do I need to sign up or upload my files?
JSON Repair is 100% free to use with no signup, no registration, and no usage limits. All processing happens locally in your browser - your files and data never leave your device, so no upload is required and your privacy is fully protected.