JSLint
lastmod 2026-11-10created 2020-09-252 edits
JSLint is a JavaScript code quality checker created by Douglas Crockford. It checks code against the good coding conventions he defined, and because few of its checks can be changed through configuration, it is known as an opinionated tool. It established itself as the original JavaScript linter, and JSHint is a fork made by people who found this strictness inconvenient. Today ESLint, which lets you configure rules freely, is the mainstream choice, but JSLint remains significant as the starting point of linting culture.