REST Assured Tutorial 66 – How To Parse A JSON Array Response To A Java List In Rest Assured?

As a part of the End to End REST Assured Tutorial, in this post, we will learn to parse a JSON Array response to a Java List in Rest Assured.

It is not always necessary to convert the response to a POJO class instance to fetch values. We can cast or convert a JSON Array response into a Java List directly. It is useful if you do not use Pojo classes.

How To Parse A JSON Object Response To A Java Map In Rest Assured

We are using the below version of Rest Assured:-

  io.rest-assured rest-assured 4.3.3 test

Once a response is returned and if it is a JSON array then we can parse them as a List. There is a method called as() which takes a TypeRef reference to support classes with generics. For example – A JSON Array can be represented as a List. To cast Json Array response in such type we need to use as() method with TypeRef. TypeRef is an abstract class that is used to specify generic type information when de-serializing a response.

package RestAssuredConcepts; import java.util.List;
import java.util.Map; import io.restassured.RestAssured;
import io.restassured.common.mapper.TypeRef; public class ParseJsonArrayResponseToList { public static void main(String[] args) { List> responseBody = null; responseBody = RestAssured .given() .baseUri("https://restful-booker.herokuapp.com/") .basePath("booking") .when() .get() .then() .extract() .body() // Extract response as List> // Since the response in a List of Map format. .as(new TypeRef>>() {}); System.out.println("Total bookings : "+ responseBody.size()); System.out.println("All booking ids are: "); for(Map booking : responseBody) { System.out.println(booking.get("bookingid")); } } }

Total bookings : 10
All booking ids are: 
10
4
6
1
3
7
2
5
8
9

You can download/clone the above sample project from here.

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