name Property

Returns the name of an error.


  • errorObj
    Required. Instance of Error object.


The name property returns the name or exception type of an error. When a runtime error occurs, the name property is set to one of the following native exception types:

Exception Type



This error is a user-defined error, created using the Error object constructor.


This error occurs whenever there is an attempt to convert an object into something to which it cannot be converted.


This error occurs when a function is supplied with an argument that has exceeded its allowable range. For example, this error occurs if you attempt to construct an Array object with a length that is not a valid positive integer.


This error occurs when an invalid reference has been detected. This error will occur, for example, if an expected reference is null.


This error occurs when a compilation error occurs with a regular expression. Once the regular expression is compiled, however, this error cannot occur. This example will occur, for example, when a regular expression is declared with a pattern that has an invalid syntax, or flags other than i, g, or m, or if it contains the same flag more than once.


This error occurs when source text is parsed and that source text does not follow correct syntax. This error will occur, for example, if the eval function is called with an argument that is not valid program text.


This error occurs whenever the actual type of an operand does not match the expected type. An example of when this error occurs is a function call made on something that is not an object or does not support the call.


This error occurs when an illegal Uniform Resource Indicator (URI) is detected. For example, this is error occurs when an illegal character is found in a string being encoded or decoded.


The following example causes an exception to be thrown and displays the error and the description of the error.

    var arr = new Array(-1);
    print ("Error Message: " + e.message);
    print ("Error Code: " + (e.number & 0xFFFF))
    print ("Error Name: " +;

The output of this code is as follows.

Error Message: Array length must be zero or a positive integer
Error Code: 5029
Error Name: RangeError


Version 5.5

Applies To:

Error Object

See Also


description Property

message Property (Visual Studio - JScript)

number Property