[Solved] This Express code tries to parse JSON body but fails:app.use(express.json); app.post('/test', (req, res) => { res.json(req.body); });What is the error? | Node.js

Node.js - HTTP Module

This Express code tries to parse JSON body but fails:

app.use(express.json);
app.post('/test', (req, res) => {
  res.json(req.body);
});

What is the error?

Aexpress.json middleware is not called as a function

Bres.json cannot send req.body

CRoute path must be '/test/' with trailing slash

Dexpress.json does not parse JSON bodies

Step-by-Step Solution

Solution:

Step 1: Check middleware usage syntax
Middleware must be called as a function: express.json(), not express.json.
Step 2: Understand effect of missing parentheses
Without calling, middleware is not applied, so req.body remains undefined.
Final Answer:
Missing parentheses causes middleware not to run -> Option A
Quick Check:
Middleware must be called with () = B [OK]

Quick Trick: Always call middleware functions with parentheses [OK]

Common Mistakes:

Master "HTTP Module" in Node.js

9 interactive learning modes - each teaches the same concept differently

More Node.js Quizzes

This Express code tries to parse JSON body but fails: