The best VS Code extension for JavaScript development, according to our users, is GitHub Copilot. This AI-powered extension provides code autocompletion by generating code suggestions based on your input. It can often autocomplete entire functions, making coding significantly faster and more efficient.

Prettier is an opinionated code formatter that enforces strict formatting rules to keep your code consistent. This VS Code extension allows you to run Prettier on save, ensuring that your code remains clean and well-formatted without manual intervention.

The DotENV extension provides syntax highlighting for .env files in VS Code. This is particularly useful for developers who work with environment variables, as it makes the content of .env files easier to read and manage.

CodeMetrics is a VS Code extension that shows you the cognitive complexity of your JavaScript and TypeScript code. High complexity can indicate that your code may need refactoring or simplification, helping you to maintain cleaner and more maintainable codebases.

GitLens is a powerful VS Code extension with multiple features, the most basic of which is visualizing code authorship. It shows you who made the last change to your current line, along with the commit message and date. Additional features include visualizing file history, navigating through git history, and a rebase editor.

The GraphQL: Syntax Highlighting extension provides syntax highlighting for .gql, .graphql, and .graphqls files in VS Code. It also supports inline GraphQL in various languages including JavaScript, TypeScript, jsx, tsx, Vue, Svelte, PHP, ReasonML, Python, Markdown, Scala, and Ruby.