Check JSON syntax and locate errors. This checks the JSON grammar; it does not validate a schema or your application's data rules.
Input
Paste JSON or import a UTF-8 file up to 100 MB. Text up to 1,048,576 characters can be edited here.
0 characters · Input is editable.
Valid syntax can still contain duplicate object names or numbers outside your application's supported range.
Validation result
Your result will appear here after processing.
Your JSON stays in this browser. No account required.
Frequently Asked Questions
Is validating JSON with PDFPilot really free?
Yes. JSON Validator is completely free to use, with no sign-up or account required.
Are my files uploaded to a server?
No. The validation runs entirely in your browser using JSON.parse. Your file is never uploaded to PDFPilot's servers.
What kind of error message do I get for invalid JSON?
The exact error your browser's own JSON parser produces, which typically identifies what kind of syntax problem was found and often its approximate position in the file.
Does this download anything?
You can copy or download a text validation report. This checks JSON syntax, not a schema or application rules. Use JSON Formatter for a downloadable, indented copy of valid JSON.
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