Skip to main content



This rule belongs to the openapi-v3-standards-validation ruleset and states that:

In an OpenAPI v3.0.x document, the pipeDelimited style can only be used when the type of the encoding property is set as array i.e. it cannot be used for primitive or object types.

Maximum SeverityError
MessagePipe delimited style cannot be used with the current property type.
Rule SystemSemantic
Broad CategoryEncoding
Products ImpactedAPI Transformer, Code Generation, Developer Experience Portal
Tagsopenapi3 openapi standards semantic validation pipe delimited style array serialization property encoding

Suggested Fixes

  • Ensure that the type of the property set in the property's schema definition is equal to array.
  • If the property type is not expected to be an array, change the value of the style property to one that supports non-array types e.g. form, deepObject.
  • If the property type is not expected to be an array and you are unsure about which style to use, simply remove the style property definition.

For More Information