Response.ok

The ok read-only property of the Response interface contains a Boolean stating whether the response was successful (status in the range 200-299) or not.

Value

A boolean value.

Response.json()

The json() method of the Response interface takes a Response stream and reads it to completion. It returns a promise which resolves with the result of parsing the body text as JSON.

Note that despite the method being named json(), the result is not JSON but is instead the result of taking JSON as input and parsing it to produce a JavaScript object.

JSON이 아니라, JSON을 input으로 받아서 javascript object를 output하는 메소드이다.

Syntax

response.json().then(data => {
  // do something with your data
});

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Parameters

None.

Return value

A Promise that resolves to a JavaScript object. This object could be anything that can be represented by JSON — an object, an array, a string, a number...