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Check our curated list of full-stack, data structures & software architecture interview questions and answers for developers

WebSockets interview questions

WebSockets interview questions.

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  • 1.

    What are WebSockets?

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  • 2.

    What is Short Polling and what problems do we have with it?

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  • 3.

    Explain what are Server-Sent Events (SSE) / EventSource ?

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  • 4.

    What is meant by lower latency interaction with WebSockets?

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  • 5.

    Why WebSockets are preferred over HTTP in many cases?

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  • 6.

    What is the difference between WebSockets vs Server-Sent Events (SSE)?

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  • 7.

    Explain the advantages of Server-Sent Events (SSE) compared to WebSockets

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  • 8.

    What is Long Polling ?

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  • 9.

    Name and explain different communication techniques on the web

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  • 10.

    Compare the use of WebSockets vs REST APIs for real-time data. Which one is better?

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  • 11.

    What are the key features of Socket.io ?

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  • 12.

    Why choose Server-Sent Events over WebSockets?

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  • 13.

    How does the WebSocket protocol work?

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  • 14.

    What is the Sec-WebSocket-Key header used for?

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  • 15.

    What are WebSocket Frames?

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  • 16.

    Can WebSockets handle 1,000,000 concurrent connections?

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  • 17.

    When to use WebRTC vs WebSockets?

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  • 18.

    What are the key differences between Socket.io and WebSockets?

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  • 19.

    How to load balance Web Sockets?

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  • 20.

    Compare Azure Web PubSub vs SignalR ? What are pros and cons?

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  • 21.

    How can WebSockets provide better performance than Long-Polling?

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  • 22.

    How to secure WebSockets communication on your project?

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  • 23.

    How to implement CHAP authentication for WebSockets?

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  • 24.

    What are the challenges of using CDNs with WebSockets?

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  • 25.

    Explain what is the mask in a WebSocket frame?

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  • 26.

    Explain the key differences between WebSockets and raw TCP.

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