Paste the document
Add JSON copied from an API, configuration file, or application log.
JSON syntax checker
Validate JSON Online
Check whether a JSON document can be parsed, see a precise error message when it cannot, and receive a clean formatted version when it is valid.
No upload Free to use Works on mobile
Data tool
JSON Validator
Options
Validation result
0 resultsHow to use JSON Validator
Validate the syntax
The parser checks quotes, commas, brackets, values, and nesting.
Use the result
Fix the reported location or copy the formatted valid document.
Common uses
API debugging
Check copied request and response payloads.
Configuration files
Catch broken JSON before deploying an application.
Data imports
Validate records before sending them to another system.
JSON Validator FAQ
Is JSON Validator free to use? +
Yes. JSON Validator is free to use without an account or usage meter.
Is my data uploaded or stored? +
No. The processing for this tool runs locally in your browser. Entered content is not sent to our server.
Does this validate a JSON Schema? +
This page validates JSON syntax. Use a schema-specific validator when fields, types, and required properties must follow a separate contract.
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