Coding Interview Preparation on Telegram: “✅ Backend Basics Interview Questions

✅ Backend Basics Interview Questions – Part 4 (REST API) 🚀💻

📍 1. What is a REST API?
A: REST (Representational State Transfer) APIs allow clients to interact with server resources using HTTP methods like GET, POST, PUT, DELETE.

📍 2. Difference Between REST & SOAP
- REST uses HTTP, is lightweight, and supports JSON/XML.
- SOAP is protocol-based, heavier, uses XML, and has strict standards.

📍 3. HTTP Methods
- GET → Read data
- POST → Create data
- PUT → Update data
- DELETE → Delete data
- PATCH → Partial update

📍 4. Example – Creating a GET Route

app.get('/users', (req, res) => {
  res.send(users); // Return all users
});

📍 5. Example – POST Route

app.post('/users', (req, res) => {
  const newUser = req.body;
  users.push(newUser);
  res.status(201).send(newUser);
});

📍 6. Route Parameters & Query Parameters

app.get('/users/:id', (req, res) => {
  res.send(users.find(u => u.id == req.params.id));
});
app.get('/search', (req, res) => {
  res.send(users.filter(u => u.name.includes(req.query.name)));
});

📍 7. Status Codes
- 200 → OK
- 201 → Created
- 400 → Bad Request
- 404 → Not Found
- 500 → Server Error

📍 8. Best Practices
- Validate request data
- Handle errors properly
- Use consistent endpoint naming
- Keep routes modular using express.Router()

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