JSON Formatter & Validator — Beautify, Minify, Find Errors

How to format JSON (3 steps)

1. Paste your JSON into the box — a minified API response, a config file, anything.
2. Pick an action. "Format" pretty-prints it with 2 or 4 spaces so you can actually read the structure. "Minify" strips all whitespace to get the smallest possible payload. Either way, invalid JSON is reported with the exact error message the parser found.
3. Copy the result. One click, on your clipboard, ready to paste back into Postman, your code, or a config file.

Why a local formatter beats an online one

JSON often contains things you would rather not paste into a stranger's server: API keys you forgot to rotate, customer emails from a staging database, session tokens. This formatter never sends your data anywhere — JSON.parse and JSON.stringify run in your own tab. Same speed as any online tool, zero exposure.

Who needs this

Developers debugging API responses, QA engineers comparing payloads, and anyone editing .json config files (package.json, .vscode, Terraform variables) without an editor handy.

FAQ

• Does it support comments or trailing commas? No — it validates strict JSON (RFC 8259). Comments are valid in JSON5, not JSON.
• Will it corrupt my data? No. Formatting only changes whitespace and number rendering stays standard; copy output is a faithful re-serialization of the same data.
• Can I upload a .json file? Just open it in any text editor and paste — the box accepts any size a browser can hold.