ReqRes

Overview

ReqRes is a publicly available mock REST API service that assists developers in prototyping, testing, and demonstrating frontend applications. It eliminates the necessity of setting up or waiting for a backend API during the initial stages of development. The service provides a set of predefined endpoints that simulate common API interactions, such as fetching lists of users, retrieving individual user details, creating new users, updating existing ones, and handling user registration and login scenarios.

The primary use case for ReqRes is to facilitate parallel development between frontend and backend teams. Frontend developers can immediately begin building user interfaces and integrating with a realistic API structure, even before the actual backend services are fully implemented. This approach can accelerate development cycles and enable earlier testing of UI components and data flow. The API supports standard HTTP methods (GET, POST, PUT, PATCH, DELETE) and includes features like pagination for list endpoints, simulating real-world API behavior.

ReqRes is particularly suited for educational purposes, workshops, and quick proof-of-concept projects where a full backend setup would introduce unnecessary complexity or time constraints. Its simplicity and immediate availability make it a valuable tool for learning about API consumption, practicing asynchronous JavaScript, or demonstrating client-side applications that interact with a RESTful service. The service has been operational since 2013, providing a consistent and reliable resource for the developer community. The entire service, including all its features and endpoints, is available free of charge, making it accessible to individual developers and small teams without budget considerations.

Developers interacting with ReqRes can expect consistent JSON responses, which mirror typical REST API payloads. This consistency aids in predictable client-side parsing and rendering. For instance, a request to retrieve a list of users will return an array of user objects, each with properties like id, email, first_name, last_name, and avatar. Similarly, successful POST requests for user creation will return the newly created user object, often with an assigned ID and a createdAt timestamp. Error responses are also simulated, allowing developers to test their application's error handling logic. The API's straightforward documentation provides clear examples for each endpoint, simplifying integration efforts.

Key features

• Mock REST Endpoints: Provides pre-configured endpoints for common resources like users, supporting standard CRUD (Create, Read, Update, Delete) operations via HTTP methods (GET, POST, PUT, PATCH, DELETE) (ReqRes documentation).
• User Management Simulation: Includes specific endpoints for user registration and login, simulating authentication flows without requiring actual user authentication logic on the client side.
• Pagination Support: List endpoints, such as retrieving all users, support query parameters for pagination, allowing developers to test how their applications handle paginated data sets.
• Synthetic Data: Returns consistent, synthetic JSON data for all requests, ensuring predictable responses for frontend development and testing.
• Free to Use: The entire service is free, making it accessible for personal projects, educational use, and small-scale development.
• No Setup Required: As a hosted service, ReqRes requires no installation or configuration, allowing immediate use via standard HTTP requests.

Pricing

ReqRes offers its entire service free of charge, making it a cost-effective solution for development and testing needs.

For detailed information, refer to the ReqRes documentation.

Common integrations

ReqRes serves as a general-purpose mock API and can be integrated with any client or tool capable of making HTTP requests. Its primary integration points are typically development environments and testing frameworks:

• Frontend JavaScript Frameworks: Used with frameworks like React, Angular, and Vue.js for fetching and manipulating data during development and testing (MDN Web Docs on Fetch API).
• Mobile Application Development: Integrated into iOS (Swift/Objective-C) and Android (Kotlin/Java) applications to mock backend responses.
• API Testing Tools: Utilized with tools like Postman, Insomnia, or cURL for quick API endpoint validation and experimentation.
• Automated Testing Suites: Incorporated into unit and integration tests (e.g., Jest, Mocha, Cypress) to provide predictable API responses.
• Educational Platforms: Used in online courses and tutorials to demonstrate API consumption and client-server interaction.

Alternatives

• JSONPlaceholder: A free online REST API that provides fake data for testing and prototyping, offering a wider range of resources like posts, comments, albums, photos, and todos.
• Mockoon: An open-source desktop application that allows users to create and run custom mock APIs locally, offering more control over data, routes, and responses.
• MockLab: A hosted service for creating and managing mock APIs, providing features like dynamic responses, stateful mocks, and proxying.
• WireMock: A flexible library for stubbing and mocking web services, primarily used in Java for testing, but also available as a standalone server.
• Mirage JS: An API mocking library for JavaScript applications that sits between your frontend and your backend, allowing you to intercept network requests and return mock data.

Getting started

To get started with ReqRes, you can make a simple HTTP GET request to one of its endpoints. The following example demonstrates how to fetch a list of users using JavaScript's fetch API:

async function getUsers() {
  try {
    const response = await fetch('https://reqres.in/api/users?page=2');
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const data = await response.json();
    console.log('Users:', data.data); // 'data.data' because the API wraps the array in a 'data' property
    console.log('Total pages:', data.total_pages);
  } catch (error) {
    console.error('Error fetching users:', error);
  }
}

getUsers();

/*
Example successful response structure from 'https://reqres.in/api/users?page=2':
{
    "page": 2,
    "per_page": 6,
    "total": 12,
    "total_pages": 2,
    "data": [
        {
            "id": 7,
            "email": "[email protected]",
            "first_name": "Michael",
            "last_name": "Lawson",
            "avatar": "https://reqres.in/img/faces/7-image.jpg"
        },
        // ... more user objects
    ],
    "support": {
        "url": "https://reqres.in/#support-heading",
        "text": "To keep ReqRes free, contributions towards server costs are appreciated!"
    }
}
*/

This code snippet will make a request to retrieve users from the second page of the user list. Upon successful retrieval, it will log the array of user objects and the total number of pages to the console. You can adapt this example to other endpoints and HTTP methods provided by ReqRes, such as creating a user with a POST request:

async function createUser() {
  const userData = {
    name: "morpheus",
    job: "leader"
  };

  try {
    const response = await fetch('https://reqres.in/api/users', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(userData)
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    console.log('New User Created:', data);
  } catch (error) {
    console.error('Error creating user:', error);
  }
}

createUser();

/*
Example successful response structure from 'https://reqres.in/api/users' (POST):
{
    "name": "morpheus",
    "job": "leader",
    "id": "123",
    "createdAt": "2026-05-28T10:00:00.000Z"
}
*/

The ReqRes API reference provides a comprehensive list of all available endpoints and their expected request/response formats.