JavaScript Error: Uncaught TypeError: Cannot read property '' of null

JavaScript TypeError is returned when an operand or argument passed to a function is incompatible with the type expected by that operator or function. This error occurs in the browser when you read a property or call a method on an undefined object.
There are a few variations of this error depending on the property you are trying to access. Sometimes instead of undefined it will output null: Uncaught TypeError: Cannot read property '' of null

Cannot read property '' of undefined

Cannot read property '' of null

Undefined means that a variable has been declared, but the value of that variable has not yet been defined. In JavaScript, there are Undefined (type), undefined (value) and undefined (variable).
This error occurs when you try to call a method or try to access a property of a variable that does not exist (is not an object). This error occurs when we want to access a property on a variable whose value is undefined or null.

Null vs. Undefined in JavaScript The value "undefined" indicates that a variable has been declared, but no value has been assigned. On the other hand, "null" refers to a non-existent object, which basically means "empty" or "nothing". These are two values ​​generally used to indicate the absence of something. Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object.

Other Javascript errors :

• Cannot read property 1
• Cannot read property prototype
• Cannot read property split
• Cannot read property nodetype
• Cannot read property words
• Cannot read property setattribute
• Cannot read property play
• Cannot read property type
• Cannot read property play
• Cannot read property reduce
• Cannot read property zindex
• Cannot read property includes
• Cannot read property use
• Cannot read property document
• Cannot read property getelementsbytagname
• Cannot read property state
• Cannot read property 10
• Cannot read property append
• Cannot read property document
• Cannot read property tolowercase
• Cannot read property 2
• Cannot read property getitem
• Cannot read property add
• Cannot read property submit
• Cannot read property then
• Cannot read property zone
• Cannot read property ext
• Cannot read property filter
• Cannot read property hasattribute
• Cannot read property extend
• Cannot read property which
• Cannot read property ajax
• Cannot read property dataset
• Cannot read property getattribute
• Cannot read property left
• Cannot read property contains
• Cannot read property name
• Cannot read property xe
• Cannot read property call
• Cannot read property getters
• Cannot read property add
• Cannot read property key
• Cannot read property option
• Cannot read property queuedepthsort
• Cannot read property render
• Cannot read property click
• Cannot read property bridge
• Cannot read property reload
• Cannot read property classname
• Cannot read property msie
• Cannot read property ngmodule
• Cannot read property innertext
• Cannot read property textcontent
• Cannot read property getcontext
• Cannot read property webkit
• Cannot read property files
• Cannot read property length

Uncaught TypeError: Cannot read property '' of null