no-duplicated-enum-values

Requires all values in an enum to be unique.

A duplicated value in an enum is always a mistake: it adds noise for readers, and some tools reject such schemas because JSON Schema requires enum values to be unique. This rule catches copy-paste errors early in your API definition.

Example configuration:

rules:
  no-duplicated-enum-values: error

Example of incorrect enum values (duplicated value red):

schemas:
  Color:
    type: string
    enum:
      - red
      - green
      - red

Example of correct enum values (all values are unique):

schemas:
  Color:
    type: string
    enum:
      - red
      - green

• no-enum-type-mismatch

• Rule source