Free • Fast • Browser-based

JSON Formatter & Validator

A fast, private ToolPilot utility. Your data is processed locally in your browser whenever possible.

Privacy: ToolPilot is designed to process supported inputs directly in your browser. Files and text are not intentionally uploaded to a ToolPilot server by these tools.

JSON Formatter & Validator

Format, validate and beautify JSON data in one click. Fix indentation and spot syntax errors instantly — all processing happens locally in your browser.

How to format JSON

Paste your JSON. Drop in any JSON data, valid or not.
Format or validate. Beautify the structure or check for syntax errors.
Copy the clean result. Copy the formatted JSON or see exactly where the error is.

Frequently asked questions

Does it validate JSON?

Yes — invalid JSON is highlighted so you can find and fix errors quickly.

Is my data sent to a server?

No — all formatting and validation runs locally in your browser.

Can it handle large files?

Yes, up to the memory limits of your browser.

Is it free?

Yes, free with no account required.