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20 interview questions on Javascript - Security by designfor developers (2026)

Test your technical skills before an interview of Javascript - Security by design with 20 corrected questions. Beginner, Intermediate or Expert level.

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20 questions
Easy
0 vote43 runs0 comment

Why is it recommended to use Web Workers to process sensitive or complex data?

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WeLoveDevsat Sep 15, 2026
Hard
0 vote35 runs0 comment

Which approach guarantees the encapsulation of private data in a class without exposing the properties on the instance?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote27 runs0 comment

What is the main risk associated with using this Map object?

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WeLoveDevsat Sep 15, 2026
Easy
0 vote26 runs0 comment

Why is it preferable to use JSON.parse() rather than eval() to transform a string into an object?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote25 runs0 comment

What is the fundamental difference between Map and WeakMap regarding reference management?

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WeLoveDevsat Sep 15, 2026
Easy
0 vote24 runs0 comment

What is the most concise and robust pattern to access a potentially missing nested property and provide a default value?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote22 runs0 comment

What is the recommended method for inserting text content from a user into the DOM to prevent XSS flaws?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote21 runs0 comment

Which expression completes the code to ensure the absence of a prototype?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote21 runs0 comment

What is the behavior of this code when accessing proxy.name?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote21 runs0 comment

What is the structural difference between encapsulation via a closure and via an ES module?

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WeLoveDevsat Sep 15, 2026
Easy
0 vote20 runs0 comment

What is the fundamental difference between Object.freeze() and Object.seal() in JavaScript?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote20 runs0 comment

What is the architectural advantage of using WeakMap rather than Map to associate private data with DOM objects?

Web developer
WeLoveDevsat Sep 15, 2026
Hard
0 vote20 runs0 comment

What is the correct syntax to invoke the sanitize function as a tagged template?

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WeLoveDevsat Sep 15, 2026
Easy
0 vote20 runs0 comment

Why ban the use of eval() in a secure application architecture?

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WeLoveDevsat Sep 15, 2026
Medium
0 vote19 runs0 comment

What is the main advantage of using structuredClone() compared to the JSON.parse(JSON.stringify(obj)) method?

Web developer
WeLoveDevsat Sep 15, 2026
Easy
0 vote19 runs0 comment

Why do browsers mandate the HTTPS protocol for registering Service Workers?

Web developer
WeLoveDevsat Sep 15, 2026
Medium
-1 vote38 runs
2 comments

Identify the error in this code aiming to retrieve the value of the private field.

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WeLoveDevsat Sep 15, 2026
Easy
-1 vote22 runs
1 comment

What is the output of this code?

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WeLoveDevsat Sep 15, 2026
Medium
-1 vote20 runs
1 comment

What is displayed in the console after executing this code?

Web developer
WeLoveDevsat Sep 15, 2026
Easy
-1 vote20 runs
1 comment

Identify the logical error preventing this asynchronous function from working properly.

Web developer
WeLoveDevsat Sep 15, 2026