In REST Assured, how can I check if a field is present or not in the response?

September 7, 2023 by Tarik

You can use the Hamcrest matcher hasKey() (from org.hamcrest.Matchers class) on JSON strings as well.

when()
    .get("/person/12345")
.then()
    .body("$", hasKey("surname"))
    .body("$", not(hasKey("age")));