Rest Assured: Check length of json array response

Approach 1: Convert response data to list and calculate size

Response response =

given()

    .header("Accept", "application/json")

.when()

    .get("api/v1/employees/")

.then()

    .assertThat().statusCode(200).and().contentType(ContentType.JSON)

.extract()

    .response();

   

Employee[] empArray = response.as(Employee[].class);

List<Employee> emps1 = Arrays.asList(empArray);

Approach 2: Using jsonPath and getList method.

given()

    .header("Accept", "application/json")

.when()

    .get("api/v1/employees/")

.then()

.extract()

    .jsonPath().getList("$").size();

Approach 3: Using body, size() method.

given()

    .header("Accept", "application/json")

.when()

    .get("api/v1/employees/")

.then()

    .assertThat().statusCode(200).and()

    .contentType(ContentType.JSON).and()

    .body("size()", is(size));

TestApp.java

package com.sample.app;

import static io.restassured.RestAssured.given;
import static org.hamcrest.Matchers.is;

import java.util.Arrays;
import java.util.List;

import org.junit.Test;

import com.sample.app.model.Employee;

import io.restassured.RestAssured;
import io.restassured.http.ContentType;
import io.restassured.response.Response;

public class TestApp {

    @Test
    public void testApp() {
        RestAssured.baseURI = "http://localhost:8080";

        /* Convert response data to list and calculate size */
        Response response = given().header("Accept", "application/json").when().get("api/v1/employees/").then()
                .assertThat().statusCode(200).and().contentType(ContentType.JSON).extract().response();
        Employee[] empArray = response.as(Employee[].class);
        List<Employee> emps1 = Arrays.asList(empArray);

        System.out.println("List Size : " + emps1.size());

        /* Using jsonPath and getList method */
        int size = given().header("Accept", "application/json").when().get("api/v1/employees/").then().extract()
                .jsonPath().getList("$").size();
        System.out.println("List Size : " + size);

        /* You can validate size like below */
        given().header("Accept", "application/json").when().get("api/v1/employees/").then().assertThat().statusCode(200)
                .and().contentType(ContentType.JSON).and().body("size()", is(size));

    }

}

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