How to Check if a Value is an Object in JavaScript

Using typeof operator

JavaScript provides the typeof operator to check the value data type.

The typeof operator returns a string indicating the type of the operand’s value.

typeof variable === 'object' returns true for:

• objects
• null
• arrays
• regular expressions
• new Date()
• new Map()
• new Set()

So these validation are required.

code

const isObject = (value) => {
  return typeof value === 'object'
  && value !== null
  && !Array.isArray(value)
  && !(value instanceof RegExp)
  && !(value instanceof Date)
  && !(value instanceof Set)
  && !(value instanceof Map)
}

There are also other strategies to check if a value is an object like:

• Using instanceof operator
• Using constructor property
• Using Object.prototype.toString() method