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Private browser tool

JSON Validator

Validate JSON syntax and locate errors.

✓ Local processing✓ No uploads✓ No account

Next step

Continue working with your file

Browse all tools →
JSON→

Format JSON

Pretty-print or minify JSON in your browser.

JSON→CSV
→

JSON to CSV

Convert arrays of JSON objects into CSV.

JSON→XML
→

JSON to XML

Convert JSON data into an XML document.

Simple by design

From file to result in three steps

  1. 1

    Choose your file

  2. 2

    Adjust the available options

  3. 3

    Download or keep working

Practical guidance

When to use Validate JSON

Best for

Structured JSON, TEXT data that needs checking, reformatting or conversion without copying it to an online service.

What you get

Produces an on-screen result output that you can inspect before downloading or copying.

Useful tip

Validate the result before replacing production data. Formats can represent dates, empty values and nested data differently.

Good to know

Frequently asked questions

Does my file leave my device?+

No. This tool processes your file inside your browser and does not send its contents, name or metadata to Filemivo.

Is Validate JSON free?+

Yes. It is free to use and has no artificial file-size limit. Your browser and device memory determine the practical limit.