FreeToolSpace

JSON Formatter & Tree Viewer

Paste your raw JSON to validate it and view it in an interactive, collapsible tree structure — updates in real-time.

Start typing or paste JSON to see the tree view

Why Use a JSON Formatter?

JSON (JavaScript Object Notation) is the standard for data exchange, but raw JSON strings can be difficult to read and debug. Our free JSON formatter helps you:

  • Validate Syntax: Instantly catch missing commas, brackets, or invalid values.
  • Visualize Structure: Collapse and expand nested objects and arrays to understand the data hierarchy.
  • Format & Beautify: Convert minified JSON into readable, pretty-printed format.
  • Secure Processing: Your data never leaves your browser. All processing happens locally on your device.

How to Format JSON Online

  1. Paste your JSON string into the input area on the left.
  2. The tree view on the right updates automatically as you type.
  3. If the JSON is invalid, an error message will guide you to fix the syntax.
  4. Click "Copy Formatted" to copy the beautified JSON to your clipboard.

Frequently Asked Questions

Is this JSON formatter free?

Yes, completely free with no signup required. No ads, no data collection.

Is my data safe?

Absolutely. All processing happens in your browser. Your JSON data is never sent to any server.