Fetch upload streamsLimited availability
The fetch() method and Request() constructor accept a ReadableStream object as the request's body option, to stream upload data to the server.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–104Not supported
105+Supportedsince Sep 2, 2022
Current: 155Edge
12–104Not supported
105+Supportedsince Sep 1, 2022
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–104Not supported
105+Supportedsince Sep 2, 2022
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: body.
Feature detection
JS · check before using
if ("fetch" in globalThis && "options_parameter" in fetch.prototype) {
// fetch.options_parameter is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (3). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| Request.Request.options_parameter.body.accepts_readablestream | 105 | 105 | ✕ | ✕ | 105 | ✕ | ✕ |
| Request.body | 105 | 105 | ✕ | 11.1 | 105 | ✕ | 11.3 |
| fetch.options_parameter.body.accepts_readablestream | 105 | 105 | ✕ | ✕ | 105 | ✕ | ✕ |