JSON Formatter
Pretty-print, minify, and validate JSON. Syntax errors show line details.
About this tool
JSON Formatter pretty-prints or minifies JSON and helps catch syntax errors in API payloads and configs.
Pretty-print one-line API payloads to inspect keys and array lengths. Minify for transport, but review in pretty form before you commit config changes.
Tip — Mask tokens and personal data before sharing formatted JSON.
How to use
- 1Enter code, JSON, regex, or other input.
- 2Run format, validate, or test actions.
- 3Review and copy the output.
FAQ
Can it handle large JSON?
It is limited by browser memory. Multi‑MB payloads may slow or fail—trim to the slice you need when possible.
What does validation check?
JSON syntax (quotes, commas, matching brackets). It may not validate a schema of required fields/types.
Indent size options?
If 2/4-space options exist, pick one; otherwise the default indent is used.
Are files uploaded to a server?
No. Every tool runs entirely in your browser. Files and text you enter are never sent to our servers.