Express js application fails to correctly parse JSON data in POST

**1. the basic setup:**

this code snippet:

* imports the `express` module.
* creates an express application.
* defines a post route `/data` that logs the received json data and sends a success response.
* starts the server on port 3000.

**2. common parsing errors and solutions:**

now let's address the common scenarios where json parsing fails:

**incorrect code (missing middleware):**

**correct code (with middleware):**

the code in section 1 shows the correct implementation with the middleware.

**b. incorrect content-type header:**

**example (client-side using `fetch`):**

if the `content-type` header is missing or set to something else (like `text/plain`), the server won't parse the body as json.

**c. invalid json data:**

the json data sent by the client must be va ...

#ExpressJS #JSONParsing #PostRequest

Express js
JSON parsing
POST request
application error
middleware
body-parser
request payload
content-type
error handling
data validation
API issues
server response
debugging
HTTP status codes