REST API Tutorial

REST is still the default architecture for web APIs and is not going anywhere. So every REST API is an API, but plenty of APIs (GraphQL, gRPC, older SOAP services) are not REST. REST is one particular style of designing a web API, built on HTTP, resources, and status codes. An API is any interface that lets two programs talk to each other. It remains the most-used web technology among developers, reported by 48.7% of respondents in the 2025 Stack Overflow Developer Survey, ahead of every framework and library. Node.js is worth the time regardless of where you learn it.

For most B2B APIs, the round-trip count never matters enough to justify the operational overhead. When the client needs https://callmeconstruction.com/news/key-strategies-for-ctos-to-leverage-mern-stack-development-effectively/ to pull deeply nested, customer-specific shapes of data in a single round trip, GraphQL beats REST. GraphQL still wins for complex client-side data fetching. If your buyer is a developer integrating your API for the first time, REST is the lowest-friction choice.

Scrimba’s scrim format lets you pause the instructor’s screencast and edit their code directly in the browser, which is the same read-run-fix loop you just saw in the build steps above. An endpoint that anyone can call and change is fine on your laptop and dangerous on the internet. That last point is the real line between a demo and a production API. Sending GET, PUT, or DELETE twice has the same effect as sending it once, so a client can safely retry on a flaky connection. As a beginner, aim to follow these four consistently.

6. Single Configuration Resource under a Single Device

Express is the most common choice, but Fastify, Koa, NestJS, and Node’s built-in http module are all options. Do I have to use Express to build a REST API in Node.js? “REST” is the architectural style; “RESTful” is the adjective for an API that follows that style. A REST API is a way for one piece of software to ask another for data or to make a change.

Since this API project will use Express, we must install it within our project using npm. The example below shows a straightforward implementation of a REST API with Node.js and Express. Now that we have reviewed the basics, it is time to build one. At scale, REST APIs might experience performance bottlenecks due to HTTP/HTTPS overhead. Versioning of REST APIs can be complex, with changes potentially breaking backward compatibility.

To try Moesif on your own API, start a 14-day free trial. Once you have built your API, you will want to start analyzing and monetizing usage. The code above is a good place to start when building APIs for your applications. Doing this lets you identify potential issues and security flaws and understand how your API design is used in practice. The REST API you build in this tutorial is the foundation; the MCP exposure is a layer on top.

Resources in REST

The tooling (Postman, OpenAPI, every HTTP client in every language) targets REST first. A few words on REST in the current API landscape, because 2026 introduced real alternatives. With our API built, the next step is to get it running on our local system and test it with Postman.

PUT updates or replaces resources

Monitor REST APIs With Moesif 14 day free trial. Whether you’re a beginner or an experienced developer, these tips, guides, and expert insights will help you navigate the world of RESTful APIs and take your skills to the next level. In the future of AI-driven applications, secure, scalable, and well-constructed (and documented) APIs are not optional; they are the foundation that allows GenAI to deliver real business value without compromising safety or trust. Well-designed APIs make data accessible, reliable, and performant for AI consumption, while robust authentication, authorization, and governance ensure sensitive information remains protected. Turn your repo or design doc into a short narrated architecture video for new engineers, plus a code-free version for product and sales. Turn an FE or PE worked problem, or an NFPA 13 hydraulic calculation, into a narrated step-by-step video with real notation, and know what it can’t replace.

4. Single Configuration Resource

Security is a potential challenge, requiring proper implementation of authentication and data transfer security practices to keep data secure. REST APIs are known for their simplicity and flexibility. Most developers are familiar with HTTP verbs. The sheer amount of frameworks and technologies available to develop and support REST APIs alone is an excellent advantage over other popular API technologies. Many different types of APIs are available; however, RESTful APIs have become the go-to technology for almost every API in production today.

• First, we will implement the GET endpoint that fetches data from the server.
• The req.body contains the data sent in the request and is sent back in the response.
• You must ensure your Node.js server is running to access your API endpoints.
• Once installed, create a request by clicking “New”, then “Request”, and saving it to a new or existing collection.

GraphQL

Like PUT, it uses req.params.id to determine which item to delete. When a GET request is made to /api/items, the callback function is executed. This https://www.e-lib.info/getting-to-the-point-7/ code can be added inside our Express project after the app.use() statement. Below is an example of each type of endpoint.

First, we need to set up the basic infrastructure for our app. Once the command is complete, Express will be installed and ready for us to use. To do this, run npm install express in your project directory.