Web platform features explorer - JavaScript promise integration (WebAssembly)

The JavaScript promise integration (JSPI) suspends a WebAssembly module when it calls a JavaScript method that returns a promise. The module resumes when the promise is resolved. You can use this to call asynchronous Web APIs from synchronous WebAssembly.

Status

Limited availability

MDN documentation

No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

https://github.com/WebAssembly/js-promise-integration/blob/main/proposals/js-promise-integration/Overview.md

Browser support

Chrome 137 Released on 2025-05-27
Chrome Android ❌
Edge 137 Released on 2025-05-29
Firefox ❌
Firefox for Android ❌
Safari ❌
Safari on iOS ❌

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