How to get the keys of an object in JavaScript
Łukasz Holeczek
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Extracting object keys is fundamental for iterating over object properties, building dynamic forms, and processing API responses in JavaScript applications.
As the creator of CoreUI, a widely used open-source UI library, I’ve used object key extraction in thousands of data processing scenarios over 25 years of development.
From my expertise, the most straightforward approach is using the Object.keys() method, which returns an array of enumerable property names.
This provides a clean, iterable list of keys for further processing.
Use Object.keys() to extract all enumerable property names from an object.
const keys = Object.keys(user)
// ['name', 'email', 'age']
Here Object.keys(user) returns an array containing all enumerable property names from the user object. This method only includes the object’s own properties, not inherited ones from prototypes. The returned array can be used with array methods like map(), filter(), or forEach() for further data processing.
Best Practice Note:
This is the same approach we use in CoreUI components for dynamic form generation and data table rendering.
For objects with Symbol keys, use Object.getOwnPropertySymbols() separately, as Object.keys() only returns string-keyed properties.
