KUBB_UNSUPPORTED_FORMAT: Unsupported format

Code: KUBB_UNSUPPORTED_FORMAT Level: warning

A schema's format is not one Kubb maps to a specific type, so it falls back to the base type.

What happened

While walking the named component schemas, the OpenAPI adapter found a format it has no specific mapping for. Generation continues with the base type, for example string. This is a warning, not a failure. The adapter reports it on every run.

How to fix it

• Use a format Kubb supports, or drop the format if the base type is enough.
• Handle the custom format with a parser or plugin that maps it to the type you want.

Common causes

• A vendor-specific format such as snowflake or money that has no built-in mapping.
• A typo in a standard format, such as date-tine instead of date-time.

Example

petStore.yaml

components:
  schemas:
    Pet:
      type: object
      properties:
        id:
          type: string
          format: snowflake # falls back to string

Example output

Terminal

[KUBB_UNSUPPORTED_FORMAT] @kubb/adapter-oas: Kubb does not map the format "snowflake" to a specific type, so it falls back to the base type.
  at: #/components/schemas/Pet/properties/id
  fix: Use a format Kubb supports, or handle "snowflake" with a custom parser or plugin.
  see: https://kubb.dev/docs/5.x/reference/diagnostics/kubb-unsupported-format

See also

• kubb validate
• Diagnostics reference