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 set
• Cannot read property apply
• Cannot read property setstate
• Cannot read property filter
• Cannot read property have
• Cannot read property concat
• Cannot read property adatasort
• Cannot read property getcontext
• Cannot read property init
• Cannot read property datatable
• Cannot read property zindex
• Cannot read property quesryselectorall
• Cannot read property each
• Cannot read property xrm
• Cannot read property toggle
• Cannot read property mouse
• Cannot read property sort
• Cannot read property textcontent
• Cannot read property error
• Cannot read property length
• Cannot read property ext
• Cannot read property bridge
• Cannot read property appendchild
• Cannot read property ngmodule
• Cannot read property jspdf
• Cannot read property editor
• Cannot read property hasattribute
• Cannot read property hasownproperty
• Cannot read property keycode
• Cannot read property 3
• Cannot read property json
• Cannot read property parentnode
• Cannot read property getattribute
• Cannot read property tolowercase
• Cannot read property locals
• Cannot read property document
• Cannot read property constructor
• Cannot read property readtext
• Cannot read property dataset
• Cannot read property ajax
• Cannot read property focus
• Cannot read property document
• Cannot read property view
• Cannot read property classlist
• Cannot read property render
• Cannot read property x
• Cannot read property queuedepthsort
• Cannot read property xhr
• Cannot read property register
• Cannot read property getitem
• Cannot read property validate
• Cannot read property left
• Cannot read property push
• Cannot read property touppercase
• Cannot read property browser
• Cannot read property props
• Cannot read property replace

Uncaught TypeError: Cannot read property '' of null