JavaScript Code Quality: Best Practices and Tools (video)

Improve JavaScript code quality with readable patterns, error handling, linting, testing, static analysis, and CI — with or without React or TypeScript.

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JavaScript Code Quality: Best Practices and Tools. Here's the short version.

JavaScript runs in browsers, Node.js, and edge runtimes — quality practices apply everywhere, not only React apps. This guide covers readable JS, async pitfalls, validation, linting vs testing vs static analysis, and CI habits.

Readable JavaScript. Prefer const by default; let when reassignment is required. Small functions with clear names; avoid deep nesting. Use modules to limit scope; avoid polluting global object. Explicit error handling — do not swallow fetch failures.

Here's an example: Prefer async/await with try/catch.

Linting, testing, and static analysis. Linting (ESLint) — style and many bug patterns at edit time. Unit tests (Vitest, Jest) — behavior for scenarios you define. Static analysis — repository-wide rules (e.g. empty catch, complexity) in tools like CodeInspector for JS/TS files. Formatting (Prettier) — consistent layout; separate from correctness.

Want to find these issues in your own code? Connect your GitHub repository to CodeInspector. You'll get findings with the file, line, severity, and a recommended fix, plus HTML and PDF reports for your team. Start free at codeinspector.app.

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