Test REST, GraphQL, and SOAP APIs with a clean, readable syntax. Built-in JSON/XML assertions, schema validation, and data-driven testing — no Java knowledge required.
Feature: User Management API
Background:
* url 'https://api.example.com'
* header Authorization = 'Bearer ' + token
Scenario: CRUD operations
# Create
Given path '/users'
And request { name: 'Jane', role: 'admin' }
When method post
Then status 201
And match response == { id: '#notnull', **: '#ignore' }
* def userId = response.id
# Read
Given path '/users/' + userId
When method get
Then status 200
And match response.name == 'Jane'Features
From simple GET requests to complex multi-step workflows, Karate makes API testing intuitive and powerful.
Validate JSON and XML responses against schemas with built-in fuzzy matching. Use #string, #number, #regex and more.
Run the same scenario with different datasets from CSV, JSON, or inline tables. No loops or test factories required.
Spin up mock servers alongside your tests. Define responses inline and test against service dependencies without infrastructure.
Run tests in parallel by default. Feature files are independent units, so scaling is automatic with zero configuration.
First-class support for GraphQL queries and SOAP/XML payloads. The same syntax works across all API protocols.
Auto-generated HTML reports with request/response logs, timings, and failure details. Integrate with CI/CD dashboards.
Integrates with your stack
Comparison
See how Karate stacks up against other popular API testing tools.
| Feature | Karate | RestAssured | Postman |
|---|---|---|---|
| No-code / Low-code | Yes | No | Partial |
| Built-in assertions | Yes — fuzzy matching | Requires Hamcrest | Limited |
| Parallel execution | Built-in | Requires TestNG/JUnit | Collection runner |
| Mock server | Built-in | Requires WireMock | Postman Mock |
| Performance testing | Re-use as perf tests | Separate tool needed | Not supported |
| UI testing | Same framework | Not supported | Not supported |
| CI/CD integration | Native | Via Maven/Gradle | Newman CLI |
| Open source | Yes — MIT | Yes | Freemium |
Karate Labs
By Peter Thomas
Creator of Karate
28 pages · PDF
A practical deep-dive from Peter Thomas, creator of Karate, on how modern API testing solves the problems that plague traditional UI-heavy test suites — flakiness, maintenance debt, in-sprint coverage gaps, and performance blind spots.
No gate, no form. Just a direct download.
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