Developer tools / JSON Formatter & Validator

JSON Formatter & Validator

Format, minify and validate JSON with precise syntax errors.

Processed locallyYour files never leave your device.

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Processed locally

Generate C#, TypeScript or Java models from representative JSON.

Processed locally

Convert flat JSON arrays and CSV tables in either direction.

Processed locally

Convert and validate JSON and YAML in either direction.

Built for the task

Fast, focused and private.

Format, minify and validate JSON locally with indentation controls and clear parsing errors.

The input stays on this device. Processing begins only after you interact with the workspace, and the page does not contain a file-upload endpoint.

Questions, answered

Is JSON Formatter & Validator free?

Yes. The tool is free to use and does not require an account.

Is my data uploaded?

No. This tool performs its work locally in your browser. Your input is not sent to NimbleWebTools.

What happens when I close the page?

Inputs and generated results are held by the current browser tab. Temporary download URLs are released when the page closes or resets.

Which browsers are supported?

Use a current browser with modern JavaScript and Web API support. The page reports a clear error when a required capability or format is unavailable.