Response: json() method

Syntax

json()

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…

Exceptions

AbortError DOMException

The request was aborted.

TypeError

Thrown for one of the following reasons:

• The response body is disturbed or locked.
• There was an error decoding the body content (for example, because the Content-Encoding header is incorrect).

SyntaxError

The response body cannot be parsed as JSON.

Examples

In our fetch JSON example (run fetch JSON live), we create a new request using the Request() constructor, then use it to fetch a .json file. When the fetch is successful, we read and parse the data using json(), then read values out of the resulting objects as you'd expect and insert them into list items to display our product data.

const myList = document.querySelector("ul");
const myRequest = new Request("products.json");

fetch(myRequest)
  .then((response) => response.json())
  .then((data) => {
    for (const product of data.products) {
      const listItem = document.createElement("li");
      listItem.appendChild(document.createElement("strong")).textContent =
        product.Name;
      listItem.append(` can be found in ${product.Location}. Cost: `);
      listItem.appendChild(document.createElement("strong")).textContent =
        `£${product.Price}`;
      myList.appendChild(listItem);
    }
  })
  .catch(console.error);

Specifications

Browser compatibility

See also

• ServiceWorker API
• Cross-Origin Resource Sharing (CORS)
• HTTP