This project is a Node.js application that utilizes Express.js for server-side logic, Axios for HTTP requests, and Redis for caching. The application serves data from an external API and implements caching to reduce redundant requests, improving performance and efficiency.

Ensure you have the following installed:

• Node.js
• npm (Node Package Manager)
• Redis server

1. Clone the repository:

   git clone <repository_url>

2. Navigate into the project directory:

   cd <project_directory>

3. Install the required npm packages:

   npm install

4. Make sure your Redis server is running. You can start it using the command:

   redis-server

1. Start the application:

   node app.js

2. The application will run on port 3000. Open your browser or use a tool like curl or Postman to make a GET request to:

   http://localhost:3000/get-data
   

• Description: Fetches data from an external API and caches it using Redis. If the data is already cached, it returns the cached data.
• Response:
  • 200 OK: Returns the data from the external API or cache.
  • 500 Internal Server Error: If an error occurs while fetching the data or connecting to Redis.

• Dependencies:

  • express: For setting up the server and defining routes.
  • axios: For making HTTP requests to external APIs.
  • redis: For caching data to improve performance.

• Setup:

  const port = 3000;
  const app = express();

• Redis Client Initialization:

  let newclinet;
  (async () => {
      newclinet = redis.createClient();
  
      newclinet.on("error", (error) => {
          console.log(error);
      });
      await newclinet.connect();
  })();

• GET /get-data Route:

  app.get("/get-data", async (req, res) => {
      try {
          const cacheData = await newclinet.get("getData");
  
          if (cacheData) {
              return res.status(200).json({ data: JSON.parse(cacheData) });
          }
  
          const response = await axios.get("https://jsonplaceholder.typicode.com/todos");
          const getData = response.data;
          await newclinet.set("getData", JSON.stringify(getData));
  
          return res.status(200).json({data: response.data});
      } 
      catch (error) {
          console.error(error); 
          return res.status(500).json({ error: "not responding" });
      }
  });

• Server Listening:

  app.listen(port, () => {
      console.log(`app is running on ${port}`);
  });

Feel free to submit issues or pull requests. For major changes, please open an issue first to discuss what you would like to change.

This project is licensed under the MIT License - see the LICENSE.md file for details.