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Exercise 3

  • Create the following folder/file structure:
    /ex_3
      |-- index.js
      |-- package.json

Todo​

  • Add the following files to the folder:

    • index.js

      const oneLinerJoke = require("one-liner-joke");
      const express = require("express");
      const app = express();
      const port = process.env.PORT || 3000;

      app.get("/", (req, res) => {
        const getRandomJoke = oneLinerJoke.getRandomJoke();
        const response = getRandomJoke.text.toUpperCase();
        res.json(response);
      });

      app.listen(port, () => console.log(`Open at http://localhost:${port}`));

    • package.json

      {
        "name": "ex_3",
        "version": "1.0.0",
        "description": "",
        "main": "index.js",
        "scripts": {
          "test": "echo \"Error: no test specified\" && exit 1",
          "start": "nodemon"
        },
        "keywords": [],
        "author": "",
        "license": "ISC",
        "dependencies": {
          "express": "^4.17.1",
          "nodemon": "^2.0.2",
          "one-liner-joke": "^1.2.0"
        }
      }

  • Run the application using npm start

  • Resolve the following error in terminal

    TypeError: Cannot read property 'toUpperCase' of undefined
      at app.get (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/index.js:8:39)
      at Layer.handle [as handle_request] (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/layer.js:95:5)
      at next (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/route.js:137:13)
      at Route.dispatch (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/route.js:112:3)
      at Layer.handle [as handle_request] (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/layer.js:95:5)
      at /Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/index.js:281:22
      at Function.process_params (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/index.js:335:12)
      at next (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/index.js:275:10)
      at expressInit (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/middleware/init.js:40:5)
      at Layer.handle [as handle_request] (/Users/davidcrossman/Development/web/nodeyqr-exercises/debug/ex_3/node_modules/express/lib/router/layer.js:95:5)

index.js​

  • Once we start the project it will otuput the following message:
    Open at http://localhost:3000
  • The page should load with the joke in uppercase from one line jokes