How do you read a path parameter and return the body in NestJS?

You read the :id path parameter with the @Param decorator, look up the post by that id, and return it — NestJS serializes the returned value into the 200 response body.

What status code does a single-lookup API return on success?

By common convention it returns 200 with the post body when the requested resource is found.

How do you verify a single-lookup API?

Fetch an existing id and confirm you get 200 with the post body. supertest lets you issue real HTTP requests.

Single post lookup API

Your task

Build an API that fetches a single post. Find the post by id and return its body. Complete the single-post lookup. Note: respond to GET /posts/:id with 200 and the body. There are 3 posts in the in-memory store.

Ground rules

•Use the in-memory array of 3 posts as given. No database.

Not required

•Creating, editing, or deleting posts.
•List view, search, pagination.

▶About this challenge

This challenge has you build a single-post lookup API in NestJS. For a GET /posts/:id request you complete the lookup so it finds the post by id and returns 200 with its body. It uses a fixed in-memory store of three posts, so you practice finding a requested resource and turning it into a response.

This problem is about the basic contract of a single-item lookup in NestJS: read the id from the path, find the post in the in-memory store, and return 200 with its body. You practice taking a GET /posts/:id request, finding the requested resource, and turning it into a clean response.

How do you read a path parameter and return the body in NestJS?: You read the :id path parameter with the @Param decorator, look up the post by that id, and return it — NestJS serializes the returned value into the 200 response body.
What status code does a single-lookup API return on success?: By common convention it returns 200 with the post body when the requested resource is found.
How do you verify a single-lookup API?: Fetch an existing id and confirm you get 200 with the post body. supertest lets you issue real HTTP requests.