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 element
• Cannot read property pending
• Cannot read property xe
• Cannot read property header
• Cannot read property addmethod
• Cannot read property queryselector
• Cannot read property validate
• Cannot read property history
• Cannot read property slice
• Cannot read property 3
• Cannot read property appendchild
• Cannot read property document
• Cannot read property prototype
• Cannot read property then
• Cannot read property version
• Cannot read property split
• Cannot read property get
• Cannot read property firstchild
• Cannot read property type
• Cannot read property reset
• Cannot read property push
• Cannot read property zoneid
• Cannot read property data
• Cannot read property render
• Cannot read property jsonmodel
• Cannot read property play
• Cannot read property target
• Cannot read property 2
• Cannot read property add
• Cannot read property browserwindow
• Cannot read property zindex
• Cannot read property helpers
• Cannot read property json
• Cannot read property xrm
• Cannot read property zone
• Cannot read property browser
• Cannot read property hasownproperty
• Cannot read property remove
• Cannot read property call
• Cannot read property getitem
• Cannot read property mouse
• Cannot read property quesryselectorall
• Cannot read property html
• Cannot read property setattribute
• Cannot read property getcontext
• Cannot read property xlsx
• Cannot read property checked
• Cannot read property append
• Cannot read property install
• Cannot read property init
• Cannot read property match
• Cannot read property document
• Cannot read property uid
• Cannot read property display
• Cannot read property queuedepthsort
• Cannot read property query
• Cannot read property hide

Uncaught TypeError: Cannot read property '' of null