JSON Validator
Validate JSON and get detailed error messages.
Frequently Asked Questions
What makes JSON valid?
Valid JSON must follow strict rules: all keys must be enclosed in double quotes, strings must use double quotes (never single quotes), there can be no trailing commas after the last element in arrays or objects, and data types must be valid (string, number, boolean, null, object, or array).
How does this tool find errors?
When your JSON is invalid, the JavaScript engine rejects it with a SyntaxError. This tool catches that error and parses the exact character position, providing a snippet showing exactly where the formatting breaks down.