The Object.getOwnPropertySymbols() static method returns an array of all symbol properties found directly upon a given object.
The Object.getOwnPropertySymbols() static method returns an array of all symbol properties found directly upon a given object.
const object1 = {};
const a = Symbol("a");
const b = Symbol.for("b");
object1[a] = "localSymbol";
object1[b] = "globalSymbol";
const objectSymbols = Object.getOwnPropertySymbols(object1);
console.log(objectSymbols.length);
/ Expected output: 2
Object.getOwnPropertySymbols(obj)
objThe object whose symbol properties are to be returned.
An array of all symbol properties found directly upon the given object.
Similar to Object.getOwnPropertyNames() itself does not contain the symbol properties of an object and only the string properties.
As all objects have no own symbol properties initially, Object.getOwnPropertySymbols() returns an empty array unless you have set symbol properties on your object.
const obj = {};
const a = Symbol("a");
const b = Symbol.for("b");
obj[a] = "localSymbol";
obj[b] = "globalSymbol";
const objectSymbols = Object.getOwnPropertySymbols(obj);
console.log(objectSymbols.length); / 2
console.log(objectSymbols); / [Symbol(a), Symbol(b)]
console.log(objectSymbols[0]); / Symbol(a)
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-object.getownpropertysymbols |