JSON Validator

Validate JSON instantly in your browser. If your JSON is invalid, this tool helps identify the error location with line and column details.

JSON input Clear

Or upload a .json file

Processed entirely in your browser

JSON is processed entirely in your browser and is never uploaded to any server.

How it works

How to Validate JSON

Paste or upload your JSON, then click Validate JSON. If it’s valid, you’ll see a success message. If not, you’ll see the error, line and column, and a snippet around the problem.

Paste or upload JSON

Paste JSON into the input box or upload a .json file using the upload area.

Click Validate JSON

The tool parses your JSON and reports whether it’s valid or shows where the first error occurs.

Fix errors using line and column

Use the reported line and column and the error snippet to locate and fix syntax issues.

FAQ

Frequently asked questions

How do I fix invalid JSON?

Paste your JSON into the validator to instantly detect syntax errors and see exactly what needs to be corrected.

Where is the error in my JSON?

The validator pinpoints the exact line and column of the error, so you can locate and fix it quickly.

Why is my JSON not working?

Most issues come from missing commas, trailing commas, unquoted keys, or mismatched brackets. The tool identifies the exact problem.

How do I find a missing comma or bracket in JSON?

The validator scans your structure and highlights missing or misplaced commas, brackets, and braces with precise error locations.

What are common JSON syntax errors?

Frequent errors include trailing commas, invalid quotes, incorrect nesting, and malformed key-value pairs.

Why am I getting an “unexpected token” error in JSON?

This usually means there’s invalid syntax, such as a missing comma, extra character, or incorrect quotation marks. The validator shows exactly where it occurs.

Why is my JSON valid in one tool but not another?

Some tools are lenient with formatting, but strict JSON requires exact syntax. This validator follows standard JSON rules to ensure compatibility.

Can I validate and format JSON at the same time?

Yes. You can validate JSON for errors and format (prettify) it for readability in one step.

Can I minify JSON after validating it?

Yes. Once valid, you can compress JSON into a minified format for production use.

Will this tool fix my JSON automatically?

The validator highlights errors, but you control the edits to ensure accuracy and avoid unintended changes.

Does this support large JSON files?

Yes. It works with large inputs, though performance depends on your browser and device.

Is my JSON data uploaded anywhere?

No. All processing happens locally in your browser. Your data is never sent or stored.