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