Coupon Code Generation and Validation: A Comprehensive Guide

Introduction: Coupon codes are an excellent way to attract and retain customers. In this guide, we will explore the concept of coupon codes and provide various API examples to help you implement them in your applications effectively.

API Examples

Create a New Coupon Code

  
  POST /api/coupons
  {
    "discount": 20,
    "code": "SUMMER20"
  }
  

Validate a Coupon Code

  
  GET /api/coupons/validate?code=SUMMER20
  {
    "valid": true,
    "discount": 20
  }
  

Get All Coupons

  
  GET /api/coupons
  [
    {
      "code": "SUMMER20",
      "discount": 20
    },
    {
      "code": "WINTER10",
      "discount": 10
    }
  ]
  

Deactivate a Coupon Code

  
  PUT /api/coupons/deactivate
  {
    "code": "SUMMER20"
  }
  

Application Example

Let’s create a simple application that generates and validates coupon codes.

Backend: Node.js/Express Application

  
  const express = require('express');
  const app = express();
  app.use(express.json());

  let coupons = [
    { code: 'SUMMER20', discount: 20, active: true },
    { code: 'WINTER10', discount: 10, active: true }
  ];

  app.post('/api/coupons', (req, res) => {
    const { discount, code } = req.body;
    coupons.push({ code, discount, active: true });
    res.status(201).send('Coupon created');
  });

  app.get('/api/coupons/validate', (req, res) => {
    const { code } = req.query;
    const coupon = coupons.find(c => c.code === code && c.active);
    if (coupon) {
      res.json({ valid: true, discount: coupon.discount });
    } else {
      res.json({ valid: false });
    }
  });

  app.get('/api/coupons', (req, res) => {
    res.json(coupons);
  });

  app.put('/api/coupons/deactivate', (req, res) => {
    const { code } = req.body;
    const coupon = coupons.find(c => c.code === code);
    if (coupon) {
      coupon.active = false;
      res.send('Coupon deactivated');
    } else {
      res.status(404).send('Coupon not found');
    }
  });

  app.listen(3000, () => console.log('Server running on port 3000'));
  

Frontend: HTML Form

  
  
  
  
    
Coupon Code Application

    
Create a Coupon
    

      Discount: 

      Code: 

      
    

    
Validate a Coupon
    

      Code: 

      
    

    
  
  
  

Now you have a simple application that can create and validate coupon codes!

Hash: 2882e276cd1d439a73962758506457c2795d59482caabe4814521ab841343f3d