✅ JSON Validator
Validate JSON with precise error locations and helpful hints
Validate JSON and find syntax errors fast. Paste your JSON to check whether it parses, and if it does not, get the line and column of the problem along with a hint about the likely cause — trailing commas, missing quotes, single quotes and other common mistakes.
Frequently asked questions
How do I find the error in my JSON?
Paste the JSON and the validator points to the exact line and column where parsing failed, with a plain-English hint. Fix that spot and re-check — errors late in a file are often caused by a missing bracket or comma earlier.
What are the most common JSON syntax errors?
Trailing commas after the last item, single quotes instead of double quotes, unquoted keys, missing commas between items, and comments (JSON does not allow them). These are all legal in JavaScript but invalid in strict JSON.
Is JSON validation different from JSON formatting?
Validation checks whether the text is legal JSON at all; formatting pretty-prints JSON that already parses. This tool focuses on validation and pinpointing errors — once it is valid, a formatter can indent it nicely.
Is my JSON sent to a server?
No. Parsing happens in your browser using the same JSON engine your code would use, so API responses or config data you paste stay on your device.