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 browser
• Cannot read property dataset
• Cannot read property bind
• Cannot read property set
• Cannot read property defaultview
• Cannot read property error
• Cannot read property filter
• Cannot read property queuedepthsort
• Cannot read property split
• Cannot read property fn
• Cannot read property document
• Cannot read property firstchild
• Cannot read property id
• Cannot read property removechild
• Cannot read property nodename
• Cannot read property websiteid
• Cannot read property append
• Cannot read property reduce
• Cannot read property datatable
• Cannot read property bind
• Cannot read property location
• Cannot read property 3
• Cannot read property validate
• Cannot read property setstate
• Cannot read property zoneid
• Cannot read property value
• Cannot read property render
• Cannot read property parentnode
• Cannot read property match
• Cannot read property innertext
• Cannot read property getelementsbytagname
• Cannot read property textcontent
• Cannot read property createelement
• Cannot read property history
• Cannot read property key
• Cannot read property async
• Cannot read property tostring
• Cannot read property props
• Cannot read property pending
• Cannot read property keyboard
• Cannot read property bridge
• Cannot read property query
• Cannot read property slice
• Cannot read property keyup
• Cannot read property addmethod
• Cannot read property top
• Cannot read property call
• Cannot read property focus
• Cannot read property play
• Cannot read property getitem
• Cannot read property submit
• Cannot read property classname
• Cannot read property version
• Cannot read property contains
• Cannot read property files
• Cannot read property touppercase
• Cannot read property push

Uncaught TypeError: Cannot read property '' of null