JSON & DataEssential
JSON Validator
Detect syntax errors, missing commas, trailing delimiters, and unquoted keys in your JSON documents with detailed line and column coordinates.
Your input is processed locally in your browser and is not sent to our server.
JSON Input to Validate5 lines
Key Features
- Precise line, column, and position error locator
- Standard RFC 8259 JSON syntax compliance check
- Formatted structure tree verification
- Quick fix error hints (e.g. unquoted keys, trailing commas)
- Instant copy and clear controls
- Zero telemetry - 100% browser sandbox
How to Use JSON Validator
- 1Paste the JSON snippet you want to test into the editor.
- 2Click the 'Validate JSON' button.
- 3Check the status banner: green for valid, red with error coordinates if invalid.
- 4Fix the highlighted issue and re-validate.
Frequently Asked Questions
Why does JSON validation fail on single quotes?
RFC 8259 strictly requires double quotes (") for both keys and string values in standard JSON. Single quotes are not valid JSON.
Does this validator support comments?
Standard JSON does not support comments (// or /* */). If you have JSONC (JSON with comments), strip comments before validating.
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