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Testing and validation of REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

• 2016-06-17: Bas Dijkstra has been generous enough to open source his REST Assured workshop. You can read more about this here and you can try out, and contribute to, the exercises available in his github repository.
• 2016-06-03: REST Assured 3.0.0 is released. This is a new major release with lots of updates and new features such as the ability to use any HTTP method, all HTTP methods now supports multipart uploads, improved error messages, improved JsonPath etc. Note The package name has changed to io.restassured and the groupId has changed to io.rest-assured. Please see release notes and getting started guide for more details.
• 2016-06-01: Spring REST Docs 1.1.0 is released with support for REST Assured. Read more about it here.

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Here's an example of how to make a GET request and validate the JSON or XML response:

get("/lotto").then().assertThat().body("lotto.lottoId", equalTo(5));

Get and verify all winner ids:

get("/lotto").then().assertThat().body("lotto.winners.winnerId", hasItems(23, 54));

Using parameters:

given().
    param("key1", "value1").
    param("key2", "value2").
when().
    post("/somewhere").
then().
    body(containsString("OK"));

Using X-Path (XML only):

given().
    params("firstName", "John", "lastName", "Doe").
when().
    post("/greetMe").
then().
    body(hasXPath("/greeting/firstName[text()='John']")).

Need authentication? REST Assured provides several authentication mechanisms:

given().auth().basic(username, password).when().get("/secured").then().statusCode(200);

Getting and parsing a response body:

// Example with JsonPath
String json = get("/lotto").asString()
List<String> winnderIds = from(json).get("lotto.winners.winnerId");
    
// Example with XmlPath
String xml = post("/shopping").andReturn().body().asString()
Node category = from(xml).get("shopping.category[0]");

REST Assured supports any HTTP method but has explicit support for POST, GET, PUT, DELETE, OPTIONS, PATCH and HEAD and includes specifying and validating e.g. parameters, headers, cookies and body easily.

• Getting started
• Downloads
• Usage Guide (click here for legacy documentation)
• Javadoc
• Rest Assured Javadoc
• Rest AssuredMockMvc Javadoc
• XmlPath Javadoc
• JsonPath Javadoc
• Release Notes
• FAQ

Join the mailing list at our Google group.

• Change log
• REST Assured on Ohloh
• Mailing list for questions and support