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

Simply put, undefined means that a variable has been declared but has not yet been given a value. This particular error is probably the easiest to understand from an undefined point of view, because undefined is not considered an object type at all (but its own undefined type instead), and properties cannot belong to only to objects in JavaScript.
This error occurs when we want to access a property on a variable whose value is undefined or null. 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).

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 header
• Cannot read property match
• Cannot read property props
• Cannot read property play
• Cannot read property map
• Cannot read property adatasort
• Cannot read property concat
• Cannot read property files
• Cannot read property find
• Cannot read property xlsx
• Cannot read property sort
• Cannot read property use
• Cannot read property height
• Cannot read property editor
• Cannot read property keyboard
• Cannot read property validate
• Cannot read property error
• Cannot read property classlist
• Cannot read property setattribute
• Cannot read property 2
• Cannot read property emit
• Cannot read property includes
• Cannot read property toggle
• Cannot read property foreach
• Cannot read property appendchild
• Cannot read property push
• Cannot read property filter
• Cannot read property locals
• Cannot read property contains
• Cannot read property apply
• Cannot read property hasattribute
• Cannot read property target
• Cannot read property jsonmodel
• Cannot read property innertext
• Cannot read property zone
• Cannot read property keycode
• Cannot read property set
• Cannot read property key
• Cannot read property document
• Cannot read property dataset
• Cannot read property join
• Cannot read property rows
• Cannot read property replace
• Cannot read property id
• Cannot read property x
• Cannot read property removechild
• Cannot read property value
• Cannot read property async
• Cannot read property getters
• Cannot read property get
• Cannot read property add
• Cannot read property element
• Cannot read property xe
• Cannot read property bridge
• Cannot read property xhr
• Cannot read property parentnode
• Cannot read property createelement

Uncaught TypeError: Cannot read property '' of null