Mock API endpoints for integration testing

Simulate API endpoints for testing

Mock API endpoints allow you to test integrations without requiring a real target system. Requests, webhooks and payloads can be received, inspected and analyzed for debugging or integration testing. The tool is particularly useful for API development, testing and system integrations.

Inspect webhooks and incoming requests

Live Tool · IO Endpoints – configure & respond with custom mock endpoints

myinterfacedata.com

Mock endpoint: order-api

My endpoints (2 / 10)

order-apiPOST

auth: API KeyActive

stock-checkGET

auth: noneActive

Endpoint URL (ready to use)

https://io.myinterfacedata.com/mock/f4a9-11ef/order-api

Authentication

Type:API Key

Header:X-Api-Key

Delay:0 sec.

Response rule (default)

Match pattern (request body contains …)

{ "type": "ORDER", "status": "PENDING" }

HTTP Status

200

Content-Type

application/json

Default

Response body (sent back)

{
  "status": "OK",
  "orderId": "ORD-2025-00847",
  "message": "Order accepted",
  "timestamp": "2025-11-09T14:22:05Z"
}

Run integration tests without a real target system

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Fully Configurable

Set response codes, headers, body and authentication individually – for each endpoint.

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Sync & Async

Choose response mode: immediate response or simulated delay for realistic scenarios.

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Repeatable Test Cases

Save mock URLs and response rules to reproduce test cases at any time.

Use Case: Pre-testing without a finished counterpart

In a project, a REST interface to a partner system is being developed. The partner system is not yet available, but the interface specification already exists. Using IO Mock Endpoints, the tester creates a mock URL and defines the expected response rules.

For the mock URL, response codes, response headers and response body are freely configured. The asynchronous response mode allows a simulated delay to replicate realistic conditions. Authentication methods such as Basic Auth or API Key are also supported.

Furthermore, sample data can be defined as a JSON array to generate random dynamic responses. Since in practice one system is often not ready at the same time as the counterpart, pre-tests can be carried out without delay.

Through saved mock URLs and their response rules, test cases can be reproducibly repeated. The tester can validate the interface and fix potential errors before the real counterpart is available.