Can I validate JSON on a shared or locked-down computer?

Yes. FixTools is a website that runs in any browser. You do not need admin rights, software installation, or a development environment.

Can I validate JSON on mobile?

Yes. FixTools is responsive and works on mobile browsers. Paste your JSON and validate it from any device.

Do I need to be online to validate JSON?

Yes, you need a browser and internet access to load FixTools. Once loaded, validation runs locally in your browser — no further network calls are needed.

Browse tools

Free · Fast · Privacy-first

Validate JSON Without Installing Software

Validating JSON should not require installing a code editor, a command-line tool, or a browser extension. FixTools validates JSON directly in your browser — paste your JSON, click Validate, and know in seconds whether it is valid without touching your system configuration.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

⚡

Works in any browser instantly

🔒

No extension or plugin needed

✨

No CLI tools required

JSON Tool

JSON Validator

All processing happens in your browser — your files are never uploaded to any server.

🚀Open JSON Validator

100% Free · No account · Works on any device

How to use this tool

💡

Open FixTools in any browser and validate your JSON in one click — nothing to install.

How It Works

Step-by-step guide to validate json without installing software:

1
Open FixTools in your browser
Navigate to fixtools.io/json/json-validator — works in Chrome, Firefox, Safari, and Edge.
2
Paste your JSON
Copy your JSON string and paste it into the editor.
3
Validate instantly
Click Validate. No software, extension, or sign-up required.