Dev

Python

Flask service

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['POST'])
def webhook():
    try:
		    # Access data sended by POST
        data = request.json
    except Exception as e:
        # Exception catched
    return '', 200

if __name__ == '__main__':
		# Run app
    app.run(host='0.0.0.0', port=5001)

---

JS

Node server

const express = require("express");

const app = express();
const PORT = 8000;

app.get("/", async (req, res) => {
  //...
});

  

app.listen(PORT, () => {
  console.log(`Server is running at http://localhost:${PORT}`);
});

• req (request): Represents the HTTP request object, containing data such as headers, query parameters, and request body.

• res (response): Represents the HTTP response object, used to send data back to the client.

1. Expecting GET Data (Query Parameters & URL Params)

a) Query Parameters (req.query)

• Query parameters are sent in the URL after a ? and separated by &.

• Example URL:

  /search?keyword=express&limit=10

• Access query parameters using req.query:

  app.get("/search", (req, res) => {
    const keyword = req.query.keyword; // "express"
    const limit = req.query.limit; // "10"
    res.send(`Search for: ${keyword}, Limit: ${limit}`);
  });

• Use case: Searching, filtering, pagination, etc.

b) Route Parameters (req.params)

• Route parameters are part of the URL path (e.g., /user/:id).

• Example URL:

  /user/123

• Access route parameters using req.params:

  app.get("/user/:id", (req, res) => {
    const userId = req.params.id; // "123"
    res.send(`User ID: ${userId}`);
  });

• Use case: Fetching details of a specific item or user.

2. Expecting POST Data (Body Data)

For POST, PUT, PATCH requests, the data is usually sent in the request body.

a) JSON Data (req.body)

• Ensure Express can parse JSON by using the express.json() middleware.

• Example request body (JSON):

  {
    "username": "john_doe",
    "password": "secure123"
  }

• Express route to handle it:

  const express = require("express");
  const app = express();
  
  app.use(express.json()); // Middleware to parse JSON
  
  app.post("/login", (req, res) => {
    const { username, password } = req.body;
    res.send(`Logging in user: ${username}`);
  });
  
  app.listen(3000, () => console.log("Server running on port 3000"));

• Use case: Login, submitting forms, creating records.

b) Form Data (application/x-www-form-urlencoded)

• If the form sends data as application/x-www-form-urlencoded (default for HTML forms), use:

  app.use(express.urlencoded({ extended: true }));

• Example HTML form:

  <form action="/submit" method="post">
    <input type="text" name="name" />
    <input type="email" name="email" />
    <button type="submit">Submit</button>
  </form>

• Express route:

  app.post("/submit", (req, res) => {
    const name = req.body.name;
    const email = req.body.email;
    res.send(`Received: ${name}, ${email}`);
  });