ToolFu

JSON Formatter & Validator

Paste or upload JSON to format, validate, and explore with a collapsible tree view.

Input
1
Output

Paste or upload JSON to see output

Your data never leaves your browser. All formatting is done locally.

How to use

  1. Paste your JSON or upload a .json file
  2. See instant validation (valid/invalid badge)
  3. Switch between Formatted, Tree View, and Minified modes
  4. In Tree View, click any object/array to collapse or expand
  5. Copy the output or download as a file

FAQ

What does this tool do?

It formats (beautifies) messy JSON into a readable structure, validates JSON syntax, lets you explore nested data in a tree view, and can minify JSON to reduce file size.

Is there a size limit?

Since everything runs in your browser, the limit depends on your device's memory. Most devices can handle JSON files up to 10-50MB without issues.