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Empty array in "required" field in Schema Object

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Empty array in "required" field in Schema Object

According to OpenApi3 (actually, Json Schema) specification empty array is allowed for "required" field in Schema Object. (see
But swagger-editor tool throws errors like "....required should NOT have less than 1 items" and in the website written the same.
Is this a bug in the web-site documentation and in the swagger-editor tool?

SmartBear Alumni (Retired)

Hi @road21,


OpenAPI 3.0 uses JSON Schema Wright Draft 00 (aka Draft 5), which requires at least one item in the "required" list:


Empty "required" list is supported in later versions of JSON Schema, but OpenAPI has not been updated to that version yet.

Helen Kosova
SmartBear Documentation Team Lead
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