isObject
function isObject(value: unknown): value is object;
The test is typeof value === "object" with null excluded, so arrays, dates and class instances all count, while a function does not. isObjectLike is the one that also accepts functions.
isX and nonX answer a question and never interrupt control flow; requireX and requireNonX hand the value back or throw. The scheme is explained in Validation conventions.
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The value to check. |
Returns
boolean — true when the value is an object; otherwise false.
In TypeScript the guard narrows value to object inside the branch.
Examples
What passes and what does not
isObject({}); // => true
isObject([]); // => true
isObject(new Date()); // => true
isObject(null); // => false
isObject("abc"); // => false
isObject(function () {}); // => false
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.