How to Format JSON (Free)

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points

Paste
Choose
Copy

Format and Validate JSON makes messy JSON readable right away.

Steps

Paste the JSON into "Input" in Format and Validate JSON.
Choose the indent.
Copy "Output".

Use "Format and Validate JSON" (free)

Tools that go well with this

Convert CSV and JSON: Convert between CSV and JSON instantly.
Convert Files and Base64: Convert between files and Base64 text.
Remove Duplicate Lines and Sort a List: Remove duplicate lines and sort them.

If this guide helped, a small tip would mean a lot.

Send a tip (¥300)Send a gift (Amazon wishlist)

More guides for this tool