
In terms of serverless computing, the phrase lambda function was popularized by the AWS Lambda service which allows you to write functions that act as API endpoints (similar to what we will be doing with Next.js API routes). In essence, they allow functions to be passed as parameters to other functions. The theory behind lambda functions comes from the field of lambda calculus. In computer science theory terms, a lambda function is any function that is not bound to an identifier, also known as being anonymous. This API route will not be performed simply by changing the URL it must be performed through a POST request to the server, with the body of the request being the object with the described format.Īll of these routes will be written as lambda functions, with the functions accepting a req request parameter (for interacting with the user's request) and a res response parameter (for interacting with the response data to send back to the user). Request Body API route: This API route will accept a JSON object with the following format:, where QUERY is the desired format.This API route will be performed by sending a GET request to the server with the desired query URL. Because the URL of this route will change depending on the request, it is called a dynamic route. For this API, the URL will look something like this: where is replaced with the desired query.

For example, in the URL, the slug would be this-is-the-post.

In this tutorial, we will make use of this innovative feature to create a basic example of a real-world API. When combined with a serverless platform like Vercel (which was developed specifically for Next.js) or Netlify, the API routes feature of Next.js gives developers the power to easily write lambda functions for their project’s API.
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To most developers who have heard of Next.js, what comes to mind when it is mentioned is “frontend web development.” However, many may not be aware of its API routes feature, which enables you to write your frontend and backend code within the same code base. Because it is loaded with great features and has amazing documentation (along with an introductory course), Next.js is a great choice for developers of any experience level. Next.js is a framework for React that makes developing SEO-friendly sites easy and effective for developers.
