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This Snap provides the functionality to validate incoming data against a set of defined constraints.
Available constraints are:

• Pattern
• Minimum
• Maximum
• MinLength
• MaxLength
• Required
• Type

An example of a pattern can be seen in the following image:

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The pattern constraint in the screenshot above validates all incoming documents and their attributes a.c.b against the regular expression ^abc, expecting that all attribute values of a.c.b start with abc. If they do, the document is routed to the output view;

 otherwise,

the document is routed to the error view.

• Pattern is a regular expression, defined as a string value (http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.16).
• Minimum and Maximum can only be defined for number values. Allowed constraint values are numbers. (http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.9, 5.10)MinLength and MaxLength can  
• MinLength and MaxLength can only be defined for string values. Allowed constraint values are numbers. (http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.17, 5.18)integers. 
• Required can be defined for any value and will verify that a value exists. Allowed constraint values are True or False (http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.7). The Constraint value field is ignored for the Required constraint.
• Type can be defined for any source path. The default is object. Valid type definitions are: string, number, object, array, boolean, date, time, date-time, local-date-time, any.

Select this property to enable the Snap to verify if all parents in the JSON path exist, and produce an error if all parents do not exist.

Example:

When there is only one Constraint Required=true for a Source path=$a.c.b, but an input document is as follows:

{
	"a": {
		"b": {
			"c": "xyz"
		}
	}
}

The Snap does not produce an error if this property is not selected, even if the JSON path $a.c.b has no values unless there is another Constraint Required=true for a Source path=$a.c.