check object has key javascript

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1myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype

1if ('key' in myObj)
2// better
3if (!myObj.hasOwnProperty('key'))

1"key" in obj // true, regardless of the actual value
2
3If you want to check if a key doesn't exist, remember to use parenthesis:
4!("key" in obj) // true if "key" doesn't exist in object
5!"key" in obj   // ERROR!  Equivalent to "false in obj"
6
7Or, if you want to particularly test for properties of the object instance (and not inherited properties), use hasOwnProperty:
8obj.hasOwnProperty("key") // true

1if ('key' in myObj)

1if('key' in object)

1Object.prototype.hasOwnProperty()

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