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In an Express.js application, what role does the express.json() middleware serve?

easy📝 Conceptual Q1 of 15
Node.js - HTTP Module
In an Express.js application, what role does the express.json() middleware serve?
AIt converts JSON responses into XML format before sending.
BIt serves static JSON files from the public directory.
CIt parses incoming requests with JSON payloads and populates <code>req.body</code>.
DIt validates JSON schema of incoming requests automatically.
Step-by-Step Solution
Solution:

  1. Step 1: Understand Middleware Purpose

    The express.json() middleware is designed to parse JSON payloads in incoming HTTP requests.

  2. Step 2: Effect on req.body

    Once parsed, it populates the req.body object with the parsed JSON data for use in route handlers.

  3. Final Answer:

    It parses incoming requests with JSON payloads and populates req.body. -> Option C

  4. Quick Check:

    Middleware for JSON parsing affects req.body [OK]
Quick Trick: express.json() parses JSON request bodies [OK]
Common Mistakes:
  • Confusing JSON parsing with static file serving
  • Assuming it converts JSON to other formats
  • Thinking it validates JSON schema automatically

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