JavaScript APIs: REST, GraphQL, gRPC — What to Choose in 2025?

The Three Pillars of Integrations: REST, GraphQL, and gRPC in the JavaScript World

JavaScript development today is an endless exchange of data. Your application fetches currency rates, submits forms, streams video, or synchronizes documents in real-time. And every time, you choose how exactly your client will communicate with the server.

For a long time, the standard was REST. It's simple, like a hammer. But for complex projects, a hammer isn't enough — you need a Swiss Army knife (GraphQL) or even a jackhammer (gRPC).

In this article, we'll break down the three main approaches to working with APIs in JavaScript. You'll see real code examples, understand the strengths and weaknesses of each protocol, and be able to consciously choose the right tool for your next project. Let's go!

REST API: The Classic That Never Dies

REST (Representational State Transfer) is an architectural style, not a protocol. Most developers understand REST as HTTP requests to resources (GET /users, POST /orders).

What a REST Request Looks Like in JavaScript

The most popular way is the native fetch or the axios library. Here's a typical GET request:

// Get a list of users\nconst getUsers = async () => {\n  const response = await fetch('https://api.example.com/users');\n  if (!response.ok) {\n    throw new Error(`HTTP error! status: ${response.status}`);\n  }\n  const data = await response.json();\n  return data;\n};\n\n// Usage example\ntry {\n  const users = await getUsers();\n  console.log(users);\n} catch (error) {\n  console.error('Error loading users:', error);\n}\n

Pros of REST for a JavaScript Developer

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• Simplicity and predictability. GET, POST, PUT, DELETE — each verb has a clear meaning.
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• Caching. HTTP cache works out of the box, speeding up repeated requests.
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• Wide support. Any backend in any language can serve REST.
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• Tools. Postman, Swagger, Insomnia — a huge ecosystem for testing.
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Main Disadvantages of REST

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• Over-fetching (data redundancy). You request /users, and the server returns all fields, including the password (hash, of course) and internal IDs, when you only need the name and email.
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• Under-fetching (data insufficiency). To get a user and their latest orders, you need to make two requests: /users/1 and /users/1/orders.
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• Multiple endpoints. Complex business logic spawns dozens of URLs that are hard to maintain.
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When to choose REST? Ideal for simple CRUD applications, public APIs, and projects where simplicity and caching are important.

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GraphQL: Request Only What You Need

GraphQL is a query language and runtime created by Facebook (now Meta). Instead of multiple endpoints, there is one endpoint, and the client decides which fields to retrieve.

Writing a GraphQL Query in JavaScript

To work with GraphQL on the client, the @apollo/client or urql library is most often used. But you can also do it simply via fetch:

// GraphQL query via fetch\nconst query = `\n  query {\n    user(id: "123") {\n      name\n      email\n      posts {\n        title\n        createdAt\n      }\n    }\n  }\n`;\n\nconst fetchUserWithPosts = async () => {\n  const response = await fetch('https://api.example.com/graphql', {\n    method: 'POST',\n    headers: { 'Content-Type': 'application/json' },\n    body: JSON.stringify({ query })\n  });\n  const result = await response.json();\n  return result.data;\n};\n\n// Call it\nfetchUserWithPosts().then(data => console.log(data));\n

See the difference