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 findindex
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• Cannot read property error
• Cannot read property find
• Cannot read property formatdate
• Cannot read property append
• Cannot read property 2
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• Cannot read property length
• Cannot read property jspdf
• Cannot read property view
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• Cannot read property ajax
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• Cannot read property reset
• Cannot read property x
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• Cannot read property textcontent
• Cannot read property have
• Cannot read property classname
• Cannot read property display
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• Cannot read property key
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• Cannot read property zone
• Cannot read property location
• Cannot read property getelementsbyclassname
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• Cannot read property call
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• Cannot read property tolowercase
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• Cannot read property element
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• Cannot read property bind
• Cannot read property createelement
• Cannot read property pending
• Cannot read property json
• Cannot read property left
• Cannot read property push
• Cannot read property getelementsbytagname
• Cannot read property option

Uncaught TypeError: Cannot read property '' of null