Reading the Response Body

How it works

A JSON API answers with text, and a test needs Java values. response.jsonPath() parses that text once and returns an io.restassured.path.json.JsonPath, an object you can query by path. A path is a field name for a top-level key, dot-separated names for nested objects, and an index in square brackets for array elements.

JsonPath offers typed getters. getString() converts whatever it finds into a String, getInt() returns a primitive int, and the generic get() returns whatever type the parser chose: for user 1, get("age") comes back as an Integer. response.path() is a shortcut that reads one value without naming jsonPath() at all.

Missing data behaves differently per getter. A path that matches nothing makes getString() return null, but getInt() on the same path throws a NullPointerException, because it cannot unbox a null into an int.

About the assignment

The single-user endpoint answers with one JSON object holding an id, a name, an email, an age and a city. You request user 1 and read two of those string fields out of the body, the basic move behind every data check.

What you will do

1. 1Send a GET request to /users/1 and store the Response.
2. 2Call jsonPath() on it to get a queryable view of the body.
3. 3Read the name field and then the email field with getString().
4. 4Print them on two lines, labelled Name: and Email:, in that order.

Common mistakes

• A misspelt path returns null

  Asking for nmae instead of name raises no error with getString(). You simply get null, and a print shows the word null after your label, so check spelling against the real body.

• Reading a whole array as one value

  On the /users list, getString("name") does not pick one user. It joins every name into a single bracketed string, which looks plausible but is not a field value. Index into the array first.

• Comparing decimals with the wrong type

  A decimal such as a product price comes back from get() as a Float, which is not equal to the double literal you typed. Use getDouble() when the comparison needs a double.

In a real test suite

Related lessons

• Your First REST Assured TestThe first GET request and how baseURI decides where it goes.
• Extract Single ValueRead fields straight out of a validated chain with extract().
• Deserialize Response to POJOMap the same user JSON onto a Java class instead of reading fields one by one.

To try one of these calls on any API endpoint without a task, open the Online Selenium Java Compiler (REST Assured is included).

Starter code

The editor above opens with this code. Fill in the TODO lines, then run and submit it.

import io.restassured.RestAssured;
import io.restassured.response.Response;
import io.restassured.specification.RequestSpecification;

public class Main {
    public static void main(String[] args) {
        RestAssured.baseURI = "https://testkru.com/api";

        // TODO: GET /users/1
        // TODO: Extract "name" using response.jsonPath().getString("name")
        // TODO: Extract "email" similarly
        // TODO: Print both in the format shown
    }
}