How do I extract a value from a JSON response with REST Assured JsonPath?

Question

Need to chain: POST /login, grab token, use in next request. Cleanest way?

Sam Okafor · Accepted Answer

Use `JsonPath` from the response body, or extract inline with `path()`.

```java
Response res = given().when().get("/api/orders/1001").then().statusCode(200).extract().response();

String status   = res.jsonPath().getString("status");
int    itemCount = res.jsonPath().getList("items").size();
String firstSku = res.jsonPath().getString("items[0].sku");
List<String> allSkus = res.jsonPath().getList("items.sku");

// filter syntax (Groovy GPath)
String pricey = res.jsonPath().getString("items.find { it.price > 100 }.sku");
```

Notes that save time: REST Assured uses Groovy GPath, not strict Jayway JsonPath, so `find`, `findAll`, `collect` and `it` all work but `$..` recursive descent does not. Prefer `extract().response()` once and query it many times instead of re-sending the request. For typed extraction map straight to a POJO with `res.as(Order.class)` and assert on fields — it fails louder than string comparison when the schema drifts.

String token = given()
    .contentType(ContentType.JSON)
    .body(Map.of("email","a@b.com","password","secret"))
  .when()
    .post("/login")
  .then()
    .statusCode(200)
    .extract().jsonPath().getString("token");

given()
  .header("Authorization","Bearer " + token)
.when()
  .get("/me")
.then()
  .statusCode(200);

How do I extract a value from a JSON response with REST Assured JsonPath?

1 answer