JSON formatter

Beautify, validate or minify JSON, privately.

Pasting API responses or config into an online formatter can leak secrets. This one runs locally, so tokens and customer data stay on your machine.

How to use it

  1. Paste JSON.
  2. Pick an indent or Minify.
  3. Copy the result.

Questions

Are my files uploaded to a server?

No. The tool runs entirely in your browser using JavaScript, so your files never leave your device. You can even disconnect from the internet after the page loads and it keeps working.

Guides

All guides
Developer tools · 23 Oct 2026How to Decode a URL Encoded String (%20 and More Explained)Decode URL encoded strings like %20 and %3A online or in JavaScript, Python, Java and C#. Learn encodeURIComponent, + vs %20 and query strings.Developer tools · 23 Oct 2026JSON Formatter and Validator: Fix Common JSON Errors FastFormat and validate JSON privately, understand errors like trailing commas and single quotes, and format JSON in VS Code, Notepad++ or the terminal.Developer tools · 23 Oct 2026How to Check the SHA-256 Hash of a File (Windows, Mac, Linux)Check a file's SHA-256 hash with certutil or PowerShell on Windows, shasum on Mac, sha256sum on Linux, or in your browser. Verify downloads properly.

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