Why use a local JSON formatter?

Many online JSON formatters log pasted payloads on backend servers, leaking tokens or customer records. This tool runs 100% via native JSON.parse/stringify in your browser.

JSON formatter & validator

Validate, pretty-print (2-space indent) or minify JSON payloads locally in your browser.

Direct answer

Validate JSON syntax and format or minify payloads locally in your browser without sending API keys or production data to third-party formatters.

How it's calculated

Paste raw JSON.
Click Format (2-space indent) or Minify.
Copy the validated output or inspect the exact syntax error position.

Frequently asked questions

Why use a local JSON formatter?: Many online JSON formatters log pasted payloads on backend servers, leaking tokens or customer records. This tool runs 100% via native JSON.parse/stringify in your browser.