Know your formats
Supported formats and limitations
- Input formats
- JSON
- Output formats
- TXT
- Syntax validation supports up to 64 levels. JSON Schema and application-specific rules are outside its scope.
Paste JSON or choose a UTF-8 JSON file to check its syntax. Errors identify the parser’s reason for rejection, and a valid result offers a TXT report. Nesting is limited to 64 levels. Passing this check does not establish that the data fits a JSON Schema or an API contract.
Maximum input size is 2 MiB per file.
A local workflow
How to use this converter
Your file contents stay in the browser as you work.
Paste JSON or select a file.
Run the syntax check.
Read the result or download the syntax report.
A little more clarity
Frequently asked questions
Does valid JSON guarantee it matches my API?
API contracts may require specific fields and data types. This tool verifies JSON syntax.
Is JSON Validator available now?
This tool runs locally with JavaScript enabled. Check its supported formats and size limits before converting.