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Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

Any category Programming16 Python 6 JavaScript 4 TypeScript 6 DevOps1 Docker 1
Any topics APIs and Integrations 5 Automation and Scripting 1 Data Structures and Algorithms 2 Object-Oriented Programming 3 Packaging and Dependencies 4 Performance Optimization 6 Programming Basics 10 Programming Patterns 5 Testing and Debugging 10 Type Systems 1 Web Development 3
Any level Intermediate 3 Advanced 1
JavaScript Packaging and Dependencies Clear filters 4 results
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Fix "Cannot use import statement outside a module"

The file was loaded as a classic script or CommonJS, where import isn't allowed. The fix in the browser is type="module". In Node it's "type": "module" or .mjs, and recent npm init writes "type": "commonjs" for you.

5 min read
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Install Node.js and Check It Actually Works

Install the LTS version of Node.js, check the installer's signature, and prove it works in a new terminal with node -v, npm -v and one real install. Plus the fixes for "not recognized" and the wrong version showing.

5 min read
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npm install vs npm ci: Same Install on Every Machine

Use npm ci to install exactly what the lock file says and npm install to change it. What each command does, when to use which, and how to fix "npm ci can only install packages when your package.json and package-lock.json are in sync".

5 min read
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Build and Publish a Small npm Package

Set up name, version, exports and files in package.json, check exactly what ships with npm pack --dry-run, then publish with npm publish. Mistakes in a published version can't be undone.

4 min read