Linting is the automated process of scanning source code for errors, suspicious patterns and style violations, without actually running the program. A tool called a linter reads the code, compares it against a set of rules, and reports anything that looks wrong or inconsistent. ESLint for JavaScript and Ruff for Python are two common examples.
Think of it like a spell checker in a word processor. As you type, it quietly underlines the misspelled word and the comma in the wrong place, so the mistake never makes it into the final document. A linter does the same for code: it flags the missing bracket or the variable nobody uses before that code reaches your customers. This keeps the codebase clean and consistent, which matters most when several developers touch the same files.
The rules are not fixed in stone. A team picks a shared config, turns off the checks it disagrees with, and can add its own. A linter can warn that a variable is declared but never read, or flag an equality check that compares the wrong types, the kind of bug that slips past a quick glance but breaks at runtime.
Linters usually run in three places: in the developer’s editor as they type, as a check during code review, and automatically in the build pipeline so nothing slips through. Because the rules are agreed once and applied by a machine, reviews stop wasting time on formatting and focus on logic instead.
At TopDevs we set up linting on day one of every project, so the code stays consistent no matter how many people work on it and small bugs get caught long before a user ever sees them.
