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 push
• Cannot read property prototype
• Cannot read property words
• Cannot read property reduce
• Cannot read property formatdate
• Cannot read property then
• Cannot read property trim
• Cannot read property bind
• Cannot read property firstchild
• Cannot read property type
• Cannot read property add
• Cannot read property match
• Cannot read property display
• Cannot read property getters
• Cannot read property focus
• Cannot read property zone
• Cannot read property msie
• Cannot read property xrm
• Cannot read property keyup
• Cannot read property readtext
• Cannot read property adatasort
• Cannot read property jquery
• Cannot read property getcontext
• Cannot read property replace
• Cannot read property keyboard
• Cannot read property uid
• Cannot read property install
• Cannot read property getelementsbyclassname
• Cannot read property contains
• Cannot read property use
• Cannot read property jsonmodel
• Cannot read property split
• Cannot read property checked
• Cannot read property preventdefault
• Cannot read property concat
• Cannot read property async
• Cannot read property filter
• Cannot read property ngmodule
• Cannot read property html
• Cannot read property editor
• Cannot read property length
• Cannot read property join
• Cannot read property foreach
• Cannot read property append
• Cannot read property includes
• Cannot read property createdocumentfragment
• Cannot read property hasownproperty
• Cannot read property 3
• Cannot read property split
• Cannot read property jspdf
• Cannot read property query
• Cannot read property remove
• Cannot read property value
• Cannot read property keycode
• Cannot read property toggle
• Cannot read property browserwindow
• Cannot read property addeventlistener

Uncaught TypeError: Cannot read property '' of null