API Testing Data Generator

Generate Realistic API Testing Data with AI

Create comprehensive test data for REST APIs, GraphQL endpoints, and microservices. Perfect for API development, integration testing, and mock server responses. Join our waitlist for early access.

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REST & GraphQL

Mock responses

# Generated API response example

GET /api/users/123
HTTP/1.1 200 OK
Content-Type: application/json

{
  "id": 123,
  "name": "Sarah Chen",
  "email": "sarah.chen@example.com",
  "role": "developer",
  "profile": {
    "avatar": "https://api.example.com/avatars/123",
    "bio": "Full-stack developer with 5 years experience",
    "location": "San Francisco, CA"
  },
  "permissions": ["read", "write", "deploy"],
  "last_login": "2024-06-07T14:30:00Z"
}

Why Choose Our API Testing Data Generator?

Built specifically for API developers, QA engineers, and DevOps teams who need realistic test data for modern API architectures.

REST API Ready

Generate realistic REST API responses with proper HTTP status codes, headers, and JSON payloads that mirror real-world APIs.

GraphQL Support

Create complex GraphQL test data with nested relationships, queries, mutations, and subscription responses.

Mock Server Data

Perfect for tools like Postman, Insomnia, and WireMock. Generate data that integrates seamlessly with your testing workflow.

Error Scenarios

Generate realistic error responses, edge cases, and failure scenarios to thoroughly test your API error handling.

Load Testing Ready

Generate large volumes of test data for performance testing, load testing, and stress testing your API endpoints.

Schema Validation

Generate data that conforms to your OpenAPI specs, JSON schemas, and GraphQL schemas for accurate testing.

Perfect for Every API Testing Scenario

From unit testing to integration testing, our API data generator covers all your testing needs across the development lifecycle.

🚀 API Development

Generate mock responses during development to work independently of backend services.

Use cases: Frontend development, API prototyping, Contract testing, Parallel development

🧪 Integration Testing

Test API interactions between services with realistic data that covers edge cases.

Use cases: Microservices testing, E2E testing, API gateway testing, Service mesh validation

⚡ Performance Testing

Generate large datasets for load testing and performance benchmarking of your APIs.

Use cases: Load testing, Stress testing, Capacity planning, Performance monitoring

# GraphQL query response example

{
  "data": {
    "users": [
      {
        "id": "usr_1",
        "name": "Alex Rivera",
        "posts": [
          {
            "title": "Building Scalable APIs",
            "likes": 247,
            "comments": [
              {
                "author": "Maya Patel",
                "text": "Great insights!"
              }
            ]
          }
        ]
      }
    ]
  }
}

Common API Testing Patterns

Generate test data for the most common API patterns and scenarios used in modern applications.

REST API Endpoints

POST /api/orders
{
  "customer_id": "cust_456",
  "items": [
    {
      "product_id": "prod_789",
      "quantity": 2,
      "price": 29.99
    }
  ],
  "total": 59.98
}

Error Responses

HTTP/1.1 422 Unprocessable Entity
{
  "error": "validation_failed",
  "message": "Invalid input data",
  "details": [
    {
      "field": "email",
      "code": "invalid_format"
    }
  ]
}

Ready to Get Early Access to API Testing Data?

Join thousands of API developers and QA engineers on our waitlist for exclusive early access to MockData AI. Be the first to generate realistic API testing data with AI.

Join Waitlist - Free Early Access Get Lifetime Deal

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Explore More Data Formats

MockData AI supports multiple data formats for all your testing needs.

JSON Generator

Generate JSON test data for general API development and testing.

Explore JSON Generator →

CSV Generator

Create CSV test data for data analysis and spreadsheet applications.

Explore CSV Generator →

Database Seeding

Generate SQL inserts and database fixtures for development.

Coming Soon →