.then(response => response.json()) what does it do code example

Example 1: fetch response json or text

const _fetch = async props => {
   const { endpoint, options } = props
   return await fetch(endpoint, options)
   .then(async res => {
      if (res.ok) {
         return await res.clone().json().catch(() => res.text())
      }
      return false
   })
   .catch(err => {
      console.error("api", "_fetch", "err", err)
      return false
   })
}

Example 2: response body api

Basicall we are checking response body
to verify if request matches with response.
In the response we are verifying
(body, status code, header, response time,
 test structure of json against the given jsonSchema)
 
 
If file not under resources: 
File schemaFile = new File("src/test/resources/postSuccessResponseSchema.json");

     given()
        .spec(adminReqSpec)
        .contentType(ContentType.JSON)
        .body(abcUtil.getRandomHeroPOJO_Payload()).
     when()
        .post("/HEROS").
     then()
        .body(matchesJsonSchema( schemaFile )  ) 
        
        
If schema file under resources:
  given()
      .spec(adminReqSpec)
      .queryParam("nameContains","a")
      .queryParam("gender","Female").
  when()
      .get("/abc/search").
 then()
 	  .time( lessThan(2000L));	
      .body(matchesJsonSchemaInClasspath("searchSpartanSchema.json") )