Challenge: Build an API to Fetch Posts

Problem statement

Below are the functions that needs to be implemented in order to finish the challenge. A code editor is provided after the problem statement to complete the coding challenge. Make sure all the points are implemented. After the coding challenge, there is a solution provided at the end.

Requirements

• Implement the fetchPosts() function in the utils.js file. Below are the requirements:

  • The function will accept two parameters: limit and offset where limit will tell how many posts need to be returned in the response and offset will tell from which position/index we need to start fetching the posts. Consider that there are a total of 100 posts. Now, in the first API call, we only want to fetch the first 10 posts (limit = 10 and offset = 0 since we need to start fetching from the first post itself). In the next API call, we want to fetch the next 10 posts (limit = 10 and offset = 10 since now we want to fetch from the 11^th post which is indexed at 10 in a list). And the process continues.

  • Make an API call to https://jsonplaceholder.typicode.com/posts using axios. It will return a list of 100 posts. Process them so that each post has only id, title, and body and nothing else. Also, process them to accommodate the limit and offset given in the function params.

  • Finally return the set of posts as per the limit, offset, and require data for each post in a list.

• Implement the validateRequestMiddlewareFunction() in middleware.js file. Below are the requirements:

  • Add a check on the request's query parameters that if there is no value sent for limit and offset, then set a default value of 10 and 0 to limit and offset respectively.

  • Make sure the values for limit and offset are converted to integer since the query parameters are considered in string by default.

• Implement the API route to fetch the posts in the index.js file. Below are the requirements:

  • An endpoint /fetch-posts is already created and please do update the endpoint.

  • Call the fetchPosts() function and make sure error-handling is implemented properly.

  • In case of any error, return an object in the response containing error key and the error message as its value. Also, send the status code as 400.

Try it yourself

Below is the code block in which you can complete the coding challenge as per the requirements given.