📍 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 is an architectural style using HTTP, lightweight, and supports JSON/XML for stateless communication.
⦁ SOAP is a strict protocol, heavier, XML-only, stateful, with built-in standards for enterprise reliability and security.
📍 3. HTTP Methods
⦁ GET → Read data
⦁ POST → Create data
⦁ PUT → Update data (full replacement)
⦁ 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 (e.g., /api/v1/users)
⦁ Keep routes modular using express.Router()
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