What types of errors does the validator detect?

Our validator detects all JSON syntax errors including: missing or extra commas, unmatched brackets/braces, invalid escape sequences, unquoted keys, trailing commas, single-quoted strings, and more.

Does it show the exact error location?

Yes! The validator shows the exact line number and character position where the error occurs, along with a human-readable description of what went wrong.

Can it validate against a JSON Schema?

This tool validates JSON syntax. For schema validation, use our JSON Schema Generator to create a schema, then validate your data against it.

Is validation done on the server?

No. All validation is performed in your browser using JavaScript's native JSON.parse(). Your data never leaves your device.

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JSON Validator

Validate JSON with precise error locations

100% client-side — your data never leaves your browser

Ctrl+Enter to process

Input

Output

Output will appear here...

Privacy guarantee:Unlike jsonformatter.org which leaked 80,000+ files in November 2025, JSONShield processes everything in your browser. Zero network requests with your data. Open your browser DevTools (Network tab) to verify — you'll see zero outbound requests containing your JSON.

How to Use JSON Validator Online

Paste or type your JSON data into the input panel above
The result appears instantly in the output panel — or click the process button
Click "Copy" to copy the result to your clipboard

Validate JSON with precise error locations. All processing happens 100% in your browser — your data never leaves your device.

Frequently Asked Questions

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