JSON Validator
Validate JSON and detect syntax errors instantly. When the payload is valid, move to the JSON Formatter for readable output, or browse the JSON Tools hub.
Paste JSON from an API response, config file, schema sample, or debugging session to validate the syntax.
Auto-validates in a worker and highlights the failing character without blocking the UI.
Validation Result
What this validator checks
This server-rendered section gives search engines and users clear context about the validation mechanics, the privacy model, and the purpose of the result output.
How validation works
The validator attempts to parse the input with the standard browser JSON parser. If parsing succeeds, the payload is valid JSON.
If parsing fails, the validator extracts the parser message and derives line and column information when the runtime exposes a character position.
What the result helps you do
- Confirm whether a payload is valid before using it in code or markup.
- Jump to the part of the JSON that caused the parser to fail.
- Move directly into formatting once the syntax issues are fixed.
Privacy and browser execution
Validation runs in the browser. The parser executes locally in the current session and does not require posting the JSON to a remote validation endpoint.
That keeps the workflow fast and reduces exposure, though sensitive data should still be reviewed carefully before being placed in any web tool.
Related Tools
Jump to the formatter after validation or keep the broader JSON tool cluster within reach.
FAQ
What makes JSON invalid?
Common issues include trailing commas, single quotes, missing colons, and unmatched braces or brackets.
How accurate are the line and column details?
The validator uses the runtime parse error when it includes line and column data, and derives a position when only an index is available.
What should I do after validation succeeds?
If the payload is valid but hard to read, send it to the formatter next so you can work with a clean, copy-ready version.
Related Guides
Short reference pages for the syntax issues and workflows around JSON formatting and validation.