DAP Foundry dap.solutions
validate-json-first-error · client-spa · v1 · stub
Validate JSON
Paste JSON and learn whether it is valid, or see the first syntax error as a portable line and column. Runs in this tab. Nothing leaves it.
Input
Text that should be JSON.
Output
ok when valid. Otherwise error: line L column C with portable coordinates.
Limits
- Syntax only. No JSON Schema.
- Engine message text is never shown.
How this was made
The core transform was written by hand into the stub registry.
Errors
Empty or oversized input names the field and the rule.
Nothing stored
This runs in your browser tab. No upload, no cookie, no local storage, no analytics of the payload. Close the tab and it is gone.