How to Validate JSON
Validating JSON means checking whether the text follows strict JSON syntax rules and can be parsed without errors.
Direct Answer
Paste the JSON, run validation, and inspect the parse message. A good validator should tell you whether the input is valid and where it fails when it is not.
Validation workflow
- 1Paste the JSON into a validator.
- 2Run the validation action.
- 3If the JSON is valid, continue to formatting or downstream use.
- 4If the JSON is invalid, fix the reported issue and validate again.
What to look for in the result
The result should clearly say whether the JSON is valid or invalid.
If invalid, the parser should expose a human-readable message plus line and column information when available.
{
"status": "invalid",
"reason": "Unexpected token",
"line": 4,
"column": 17
}Why line and column matter
Large JSON payloads often fail because of one character. Line and column data let you jump directly to the broken area instead of scanning the whole document.
This is especially useful when debugging API responses, structured logs, and JSON-LD markup.
Best practice
- Validate first when the input came from a third party or a copied snippet.
- Format after validation so the cleaned-up output is safe to reuse.
- Keep example payloads small when isolating a syntax problem.