Newly Available WebAssembly

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.

Baseline Status: Achieved Newly Available on Sep 14, 2026 across core engines.

Desktop Browser Engine Support

Google Chrome

137

Supported

Mozilla Firefox

153

Supported

Apple Safari

27

Supported

Microsoft Edge

137

Supported

Mobile Browser Engine Support

Chrome Android

137

Firefox Android

153

Safari iOS

27

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

webassembly.jspi ↗