Runs locally
JSON Validator
Tell whether a document is valid JSON.
Ctrl+Enter runs. Ctrl+Shift+Backspace clears.
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Uses the JSON parser and reports success or a parse error. It does not change the document.
About this tool
Find out quickly whether a config file, an API payload or a fixture is valid JSON. The validator uses the standard JSON parser and reports success or the first error.
How to use it
- 01
Paste the JSON.
- 02
Read the result: valid or the parse error.
- 03
Fix the error and check again.
FAQ
Frequently asked questions
What are the most common JSON errors?
Trailing commas, single quotes instead of double quotes, unquoted keys and comments, which standard JSON does not allow.
Does it validate against a schema?
No. It checks syntax only, not the structure required by a JSON Schema.