JSON Validator
Validate JSON and pinpoint syntax errors with line and column.
Validate JSON and get the exact error location. Free, offline, runs in your browser. Read more Show less
What is JSON validation?
JSON validation checks that a document follows the JSON syntax rules. Unlike JavaScript object literals, JSON forbids trailing commas, single-quoted strings, comments, and unquoted keys. Validation catches these before a server or parser does.
FAQ
Does this tool modify my JSON?
No. It reports whether the input is valid, and on failure shows the exact line and column of the first error.
What common mistakes does it catch?
Trailing commas, single quotes, unquoted keys, unescaped control characters, missing commas between members, and stray text outside the root value.
Is my JSON sent anywhere?
No. Parsing uses the browser's built-in JSON parser.
Loads a test value into the form