isAsyncFunction javascript Code Snippet in 2025
typefunctionintermediate
Last Updated: 25 October 2025
Checks if the given argument is an async function.
- Use
Object.prototype.toString()andFunction.prototype.call()and check if the result is'[object AsyncFunction]'.
const isAsyncFunction = val => Object.prototype.toString.call(val) === '[object AsyncFunction]';
isAsyncFunction(function() {}); // false
isAsyncFunction(async function() {}); // truejavascript snippet similar to isAsyncFunction For You in October 2025
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