Free course

Express Course

Build an Express 5 application with clear routing, middleware, validation, sessions, errors, tests, security, and production behavior.

5 modules · 25 lessons · No signup

Prerequisites: JavaScript, Node.js and HTTP

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What you'll learn

Ship a tested notes application with HTML and JSON paths, secure input and sessions, useful errors, observability, and graceful shutdown.

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Course contents

  1. Express foundations

    Follow requests, construct the app, validate configuration, and serve static assets.

    1. ✓ Follow one Express request
    2. ✓ Create the application
    3. ✓ Configure without global mystery
    4. ✓ Serve static assets
    5. ✓ Check your understanding: express foundations

  2. Routes and responses

    Match routes, read inputs, negotiate representations, and finish responses once.

    1. ✓ Design route order
    2. ✓ Read params, query, and body
    3. ✓ Send one clear response
    4. ✓ Negotiate HTML and JSON
    5. ✓ Check your understanding: routes and responses

  3. Middleware and input

    Compose middleware and handle bodies, validation, uploads, cookies, and sessions.

    1. ✓ Compose middleware
    2. ✓ Parse only expected bodies
    3. ✓ Validate and normalize input
    4. ✓ Handle uploads, sessions, and cookies
    5. ✓ Check your understanding: middleware and input

  4. Errors, security, and observation

    Handle failures, proxy policy, CORS, logs, and shutdown safely.

    1. ✓ Handle async errors in Express 5
    2. ✓ Design error middleware
    3. ✓ Configure proxies, CORS, and headers
    4. ✓ Log and shut down
    5. ✓ Check your understanding: errors, security, and observation

  5. Test and ship Express

    Test the HTTP contract, separate domain logic, and verify production configuration.

    1. ✓ Test the HTTP contract
    2. ✓ Separate domain and transport
    3. ✓ Prepare production configuration
    4. ✓ Finish the notes application
    5. ✓ Check your understanding: test and ship express