Command-line tool

idnits

brew/idnits

Checked 25 Oct 2026, 21:09 UTC · Listing refreshed from Homebrew, winget, npm, Scoop and cargo; npm packages checked against OSV.dev

Looks for problems in internet draft formatting

Website

At a glance

Type

Command-line tool

Install on

Windows, macOS, Linux

Last checked

25 Oct 2026, 21:09 UTC

Install it

Windows

npm install -g @ietf-tools/idnits

macOS

brew install idnits
npm install -g @ietf-tools/idnits

Linux

npm install -g @ietf-tools/idnits

Check a file for nits

idnits path/to/file.txt

Count nits without displaying them

idnits --nitcount path/to/file.txt

Show extra information about offending lines

idnits --verbose path/to/file.txt

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