Response: json() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

Note: This feature is available in Web Workers.

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.

Syntax

js
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

DOMException AbortError

The request was aborted.

TypeError

Thrown for one of the following reasons:

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.

js
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

Specification
Fetch
# ref-for-dom-body-json①

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
json

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also