Real-Time Web Apps with WebSockets

Free Intermediate course · 10 lessons · 3 weeks · Certificate on completion

Add live chat, presence and collaborative features to web apps. Across 10 lessons you'll move from fundamentals to a portfolio-ready outcome — at your own pace, with quizzes after each lesson and a final exam to certify your mastery.

What you'll learn

• Polling vs WebSockets vs SSE
• WebSocket protocol
• Socket.IO
• Rooms and broadcasting
• Presence
• Authentication

Skills you'll pick up

• Polling vs WebSockets vs SSE
• WebSocket protocol
• Socket.IO
• Rooms and broadcasting
• Presence
• Authentication

Tools covered

• WebSockets
• Real-world projects
• Quizzes
• Final exam

Course modules

Module 1: Polling vs WebSockets vs SSE

Module 1 of Real-Time Web Apps with WebSockets. 3 lessons · 3h

Module 2: Rooms and broadcasting

Module 2 of Real-Time Web Apps with WebSockets. 3 lessons · 3h

Module 3: Scaling with Redis pub/sub

Module 3 of Real-Time Web Apps with WebSockets. 2 lessons · 2h

Module 4: Collaborative editing intro

Module 4 of Real-Time Web Apps with WebSockets. 2 lessons · 2h

Lessons in this course

• Polling vs WebSockets vs SSE
• WebSocket protocol
• Socket.IO
• Rooms and broadcasting
• Presence
• Authentication
• Scaling with Redis pub/sub
• Reconnection and offline
• Collaborative editing intro
• Project: a live chat

Instructor

Kenji Watanabe — Web Performance Engineer

Kenji Watanabe is a Web Performance Engineer with years of hands-on experience teaching WebSockets to thousands of learners worldwide.

Certificate

Finish every lesson and pass the final exam to earn a free, verifiable Learnera certificate for Real-Time Web Apps with WebSockets. It can be downloaded as a PDF and shared on LinkedIn.

Career outcomes

Median global salary $125,000 per year · median India salary ₹17,50,000 per year · 64,396 open roles worldwide

• WebSockets Specialist
• Senior WebSockets Lead
• WebSockets Consultant

Frequently asked questions

Is the Real-Time Web Apps with WebSockets course free?

Yes. Every Learnera course, including Real-Time Web Apps with WebSockets, is completely free — lessons, quizzes, the final exam, and the certificate.

How long does Real-Time Web Apps with WebSockets take?

10 lessons, typically completed in 3 weeks at a comfortable pace.

Do I get a certificate?

Yes — pass the final exam and you receive a free, verifiable certificate you can share on LinkedIn.

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