REST Assured Tutorial: API Testing in Java With Examples

REST Assured is an open-source Java DSL for REST API testing that uses a readable given/when/then structure to configure requests, execute HTTP methods, and validate status codes, headers, JSON fields, and schemas within standard Maven or Gradle test suites. It works with JUnit and TestNG, supports common HTTP operations, parameterization, serialization, JsonPath assertions, schema validation, and authentication methods including preemptive basic auth and OAuth2. The tutorial demonstrates setup with Maven, configuring a shared base URI, and CRUD tests against JSONPlaceholder, emphasizing assertions based on actual API behavior rather than assumed conventions, such as a POST returning 201 or a DELETE returning 200. It highlights REST Assured 6.0’s move to Java 17 and Groovy 5, Jackson 3 support, a pure-Java JsonPath implementation, and version 6.0.1’s limit on JSON number length to mitigate denial-of-service risks. Recommended practices include centralizing request configuration, testing response contracts and invariants rather than fragile fixture data, logging only failed validations, isolating one HTTP call per test, securing credentials through environment variables, checking dependency conflicts, and running API tests in CI alongside browser-level tests when end-user interface behavior also needs verification.

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