Check if JavaScript object is empty

Note date 28 Jan, 2021
Tags javascript
👋 FYI, this note is over 6 months old. Some of the content may be out of date. 
if (obj && Object.entries(obj).length === 0 && obj.constructor === Object) {
  // do something
}

or use a function:

export const isObjectEmpty = (obj: unknown): boolean => {
  if (obj === null || obj === undefined || obj === false) {
    return true
  }
  return Object.entries(obj).length === 0
}

// isObjectEmpty({}) true
// isObjectEmpty({a: 1}) false

You can also invert that function to check if an object has values.

export const isObjectFull = (obj) => !isObjectEmpty(obj)

Not sure about the naming of this one, but you get the idea

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