Express.js Course
Express.js
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Beginner

res.json()

Definition

Sends a JSON response. This method sends a response (with the correct content-type) that is the parameter converted to a JSON string using `JSON.stringify()`. It's the standard method used when building REST APIs.

Explain Like I'm New

Sends a JSON response.

Interactive Example

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Interview Questions

basic

  • What is the primary purpose of res.json() in Express.js?
  • How do you initialize res.json()?

intermediate

  • How does res.json() integrate with other middleware components?
  • Can you explain a common use case for res.json()?

advanced

  • What are the performance implications of res.json() in a high-traffic production application?
  • How would you debug issues related to res.json()?

trick

  • Is it possible to achieve the same result as res.json() without using Express?

Flash Cards

Question

Define res.json() in your own words.

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Answer

Sends a JSON response.

Question

When should you avoid using res.json()?

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Answer

It depends on the specific architectural requirements and performance bottlenecks of your application. Overusing it can sometimes lead to tightly coupled code.