caching3-index.js

const express = require('express');
const axios = require('axios');
const redis = require('redis');
 
const app = express();
 
const port = 3000;
 
// make a connection to the local instance of redis
const client = redis.createClient(6379);
 
client.on("error", (error) => {
 console.error(error);
});
 
app.get('/recipe/:fooditem', (req, res) => {
 try {
   const foodItem = req.params.fooditem;
 
   // Check the redis store for the data first
   client.get(foodItem, async (err, recipe) => {
     if (recipe) {
       return res.status(200).send({
         error: false,
         message: `Recipe for ${foodItem} from the cache`,
         data: JSON.parse(recipe)
       })
     } else { // When the data is not found in the cache then we can make request to the server
 
         const recipe = await axios.get(`http://www.recipepuppy.com/api/?q=${foodItem}`);
 
         // save the record in the cache for subsequent request
         client.setex(foodItem, 1440, JSON.stringify(recipe.data.results));
 
         // return the result to the client
         return res.status(200).send({
           error: false,
           message: `Recipe for ${foodItem} from the server`,
           data: recipe.data.results
         });
     }
   }) 
 } catch (error) {
     console.log(error)
 }
});
 
app.listen(port, () => {
 console.log(`Server running on port ${port}`);
});
 
 
module.exports = app;