Linting is built into Insomnia for Design Documents. As you type, Insomnia validates your spec in the background for issues. Errors are indicated by a red dot next to the line number.
The Linter Panel aggregates all errors and warnings from the spec into a centralized location so it’s easier to get an overall sense of what’s going wrong without scrolling through and checking each individual line.
Errors are displayed next to the applicable code line, and in the Linter Panel below the editor.