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 y
• Cannot read property set
• Cannot read property id
• Cannot read property xhr
• Cannot read property use
• Cannot read property preventdefault
• Cannot read property bind
• Cannot read property data
• Cannot read property browserwindow
• Cannot read property adatasort
• Cannot read property then
• Cannot read property queryselector
• Cannot read property tolowercase
• Cannot read property name
• Cannot read property form
• Cannot read property html
• Cannot read property prototype
• Cannot read property init
• Cannot read property tostring
• Cannot read property includes
• Cannot read property addeventlistener
• Cannot read property indexof
• Cannot read property state
• Cannot read property get
• Cannot read property xlsx
• Cannot read property words
• Cannot read property helpers
• Cannot read property emit
• Cannot read property header
• Cannot read property display
• Cannot read property split
• Cannot read property location
• Cannot read property reload
• Cannot read property formatdate
• Cannot read property zoneid
• Cannot read property play
• Cannot read property view
• Cannot read property addmethod
• Cannot read property history
• Cannot read property nodetype
• Cannot read property validate
• Cannot read property queuedepthsort
• Cannot read property touppercase
• Cannot read property mouse
• Cannot read property checked
• Cannot read property map
• Cannot read property defaultview
• Cannot read property xe
• Cannot read property uid
• Cannot read property push
• Cannot read property nodename
• Cannot read property height
• Cannot read property match
• Cannot read property add
• Cannot read property document
• Cannot read property async
• Cannot read property hide

Uncaught TypeError: Cannot read property '' of null