Check internet-drafts for submission nits. Looks for violations of Section 2.1 and 2.2 of the requirements listed on https://www.ietf.org/id-info/checklist. More information: https://github.com/ietf-tools/idnits.
idnits {{path/to/file.txt}}
idnits --nitcount {{path/to/file.txt}}
idnits --verbose {{path/to/file.txt}}
idnits --year {{2021}} {{path/to/file.txt}}
idnits --doctype {{standard|informational|experimental|bcp|ps|ds}} {{path/to/file.txt}}