JSON Validator
Check whether a JSON document is valid and get the exact line and reason for any syntax error.
Validation result
Your result will appear here.
What is JSON Validator?
JSON Validator inspects JSON text to verify compliance with RFC 8259 syntax specifications. If a document has missing quotes, trailing commas, unescaped characters, or malformed braces, the validator highlights the exact error reason.
How to use JSON Validator
- 1Paste your JSON payload into the validation area.
- 2The tool immediately parses the syntax and indicates whether the document is valid.
- 3If errors exist, inspect the exact error message to quickly fix the issue.
Key features
Strict Syntax Validation
Checks JSON payload against strict RFC 8259 rules to ensure compatibility with parsers.
Clear Error Messages
Highlights syntax errors such as unexpected tokens, unclosed strings, or illegal trailing commas.
Instant Live Feedback
Validates continuously as you type or paste without needing to click a submit button.
Zero Data Transmission
Runs in local browser memory so confidential configuration payloads remain safe.
Examples & use cases
Trailing Comma Error
Detecting common syntax mistake in JSON arrays
{"items": [1, 2, 3,]}Invalid: Unexpected token } in JSON at position 20 (trailing comma not permitted)
Single Quotes vs Double Quotes
Catching unquoted or single-quoted string identifiers
{'status': 'active'}Invalid: Unexpected token ' in JSON at position 1 (keys and strings must use double quotes)
Frequently asked questions
Helpful guides & tutorials
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