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[[_jdiameter_validator]]
= Diameter Stack Validator

Validator is one of the Stack features.
The primary purpose of the Validator is to detect malformed messages, such as an Answer message containing a Destination-Host Attribute Value Pair (AVP).

The Validator is capable of validating multi-leveled, grouped AVPs, excluding the following content types:

* URI, or Identifier types.
* Enumerated types against defined values.

The Validator is only capable of checking structural integrity, not the content of the message.

The Validator performs the following checks:

Index::
  Checks that the AVPs are in the correct place.
  For example, `Session-Id` must always be encoded before any other AVP.

Multiplicity::
  Checks that the message AVPs occur the proper number of times.
  For example, the Session-ID should only be present once.

The `Validator` is called by the stack implementation.
It is invoked after the message is received, but before it is dispatched to a remote peer.

NOTE: This means that if the peer does not exist in the local peer table, the validator is not called, as the stack fails before calling it. 

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include::Section-JDiameter-Validator-Configuration.adoc[]

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include::Section-JDiameter-Validator-Source_Overview.adoc[]

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