Frequently Asked Questions
What is JSON validation?
JSON validation checks whether a string conforms to the JSON specification (RFC 8259). A validator parses the input and reports any syntax errors — such as missing commas, unquoted keys, or mismatched brackets — along with the position in the document where the error occurred.
JSON Validator vs JSON Formatter — what is the difference?
A JSON Validator checks whether the JSON is syntactically correct and reports errors. A JSON Formatter does that too, but also reformats the output with consistent indentation. Use a validator when you only need to confirm validity without changing the structure, and a formatter when you want to beautify the output as well.
What causes "Invalid JSON" errors?
Common causes of invalid JSON include: trailing commas after the last item in an array or object (not allowed in JSON), using single quotes instead of double quotes for strings, unquoted property keys, missing commas between items, and extra data after the root value. JavaScript object literals are not valid JSON.