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IsWDDX
Last update:
May 18, 2026
Description
Determines whether a value is a well-formed WDDX packet.
Returns
True, if the value is a well-formed WDDX packet; False, otherwise.
Category
Syntax
IsWDDX(value)See also
Using WDDX in the Developing ColdFusion Applications
History
ColdFusion MX: Changed behavior: if the value parameter is not a WDDX packet, ColdFusion returns False. (In earlier releases, ColdFusion threw an error.)
Parameters
Parameter | Description |
value | A WDDX packet |
Usage
This function processes a WDDX packet with a validating XML parser, which uses the WDDX Document Type Definition (DTD). To prevent CFWDDX deserialization errors, you can use this function to validate WDDX packets from unknown sources.
Example
<!--- serialize a string into a WDDX packet --->
<CFWDDX ACTION="CFML2WDDX" INPUT="I am a string!" OUTPUT="MyWDDXPacket1">
<cfscript>
MyWDDXPacket2 = "I am a string too!"
writeOutput(EncodeForHTML(MyWDDXPacket1))
// check if MyWDDXPacket1 contains a well-formed WDDX packet
if (IsWDDX(MyWDDXPacket1)){
writeOutput("Well formed WDDX packet")
}
else {
writeOutput("Not a well formed WDDX packet")
}
// check if MyWDDXPacket2 contains a well-formed WDDX packet
writeOutput(EncodeForHTML(MyWDDXPacket2))
if (IsWDDX(MyWDDXPacket2)){
writeOutput("Well formed WDDX packet")
}
else {
writeOutput("Not a well formed WDDX packet")
}
</cfscript>
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