1. We need to pass booking id for which you want to update details in URI. E.g. https://restful-booker.herokuapp.com/booking/1 where “1” is booking id.
2. Authentication token need to pass as cookie. Cookie name is “token” and value is generated auth token. ‘Cookie: token=<generatedToken>’.
3. Pass the body with all details. Remember it is a PUT request which takes whole body like POST request.

Let’s see existing details of a Booking ID 1 using Postman:-

Generate Token:-

Let’s write PUT request in REST Assured:-

Updated Request Body:-

I have just updated firstName and lastName.

{
    "firstname" : "Amod",
    "lastname" : "Mahajan",
    "totalprice" : 111,
    "depositpaid" : true,
    "bookingdates" : {
        "checkin" : "2018-01-01",
        "checkout" : "2019-01-01"
    },
    "additionalneeds" : "Breakfast"
}

REST Assured Code:-

Non-BDD Style:-

package RestfulBooker.putExamples;
 
import org.hamcrest.Matchers;
 
import io.restassured.RestAssured;
import io.restassured.http.ContentType;
import io.restassured.response.Response;
import io.restassured.response.ValidatableResponse;
import io.restassured.specification.RequestSpecification;
 
public class NonBDDPutRequest {
 
	public static void main(String[] args) {
 
		// There is no need to add escape character manually. Just paste string within
		// double
		// quotes. It will automatically add escape sequence as required.
		String jsonString = "{\r\n" + "\"firstname\" : \"Amod\",\r\n" + "    \"lastname\" : \"Mahajan\",\r\n"+ "    \"totalprice\" : 111,\r\n" + "    \"depositpaid\" : true,\r\n" + "    \"bookingdates\" : {\r\n"+ "\"checkin\" : \"2018-01-01\",\r\n" + "        \"checkout\" : \"2019-01-01\"\r\n"+ "    },\r\n" + "    \"additionalneeds\" : \"Breakfast\"\r\n" + "}";
 
		// Create a request specification
		RequestSpecification request = RestAssured.given();
 
		// Setting content type to specify format in which request payload will be sent.
		// ContentType is an ENUM.
		request.contentType(ContentType.JSON);
		// Setting a cookie for authentication as per API documentation
		request.cookie("token", "fa0d5b1138a0d1f");
		// Adding URI
		request.baseUri("https://restful-booker.herokuapp.com/booking/1");
		// Adding body as string
		request.body(jsonString);
 
		// Calling PUT method on URI. After hitting we get Response
		Response response = request.put();
 
		// Printing Response as string
		System.out.println(response.asString());
 
		// Get Validatable response to perform validation
		ValidatableResponse validatableResponse = response.then();
 
		// Validate status code as 200
		validatableResponse.statusCode(200);
 
		// Validate value of firstName is updated
		validatableResponse.body("firstname", Matchers.equalTo("Amod"));
 
		// Validate value of lastName is updated
		validatableResponse.body("lastname", Matchers.equalTo("Mahajan"));
 
	}
}

BDD Style:-

package RestfulBooker.putExamples;
 
import org.hamcrest.Matchers;
 
import io.restassured.RestAssured;
import io.restassured.http.ContentType;
import io.restassured.response.Response;
import io.restassured.response.ValidatableResponse;
import io.restassured.specification.RequestSpecification;
 
public class BDDStylePutRequest {
 
	public static void main(String[] args) {
 
		// There is no need to add escape character manually. Just paste string within
		// double
		// quotes. It will automatically add escape sequence as required.
		String jsonString = "{\r\n" + "    \"firstname\" : \"Amod\",\r\n" + "    \"lastname\" : \"Mahajan\",\r\n"
				+ "    \"totalprice\" : 111,\r\n" + "    \"depositpaid\" : true,\r\n" + "    \"bookingdates\" : {\r\n"
				+ "        \"checkin\" : \"2018-01-01\",\r\n" + "        \"checkout\" : \"2019-01-01\"\r\n"
				+ "    },\r\n" + "    \"additionalneeds\" : \"Breakfast\"\r\n" + "}";
 
		//GIVEN
		RestAssured
			.given()
					.baseUri("https://restful-booker.herokuapp.com/booking/1")
					.cookie("token", "e88375c0fde687a")
					.contentType(ContentType.JSON)
					.body(jsonString)
			// WHEN
			.when()
					.put()
			// THEN
			.then()
					.assertThat()
					.statusCode(200)
					.body("firstname", Matchers.equalTo("Amod"))
					.body("lastname", Matchers.equalTo("Mahajan"));
 
	}
}

Note:- You need to generate access token every time you hit the request otherwise you will get error code as 403.