Web Reference: Jul 20, 2025 · Object.keys() returns an array whose elements are strings corresponding to the enumerable string-keyed property names found directly upon object. This is the same as iterating with a for...in loop, except that a for...in loop enumerates properties in the prototype chain as well. Description The Object.keys() method returns an array with the keys of an object. The Object.keys() method does not change the original object. Keep in mind that JavaScript objects are hash tables and the keys are just strings.
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