Creates a pipeline validation action that validates the size of a map, set or blob.

const Validation = maxSize<TInput, TRequirement>(requirement, message);


  • TInput extends Map<any, any> | Set<any> | Blob
  • TRequirement extends number



With maxSize you can validate the size of a map, set or blob. If the input does not match the requirement, you can use message to customize the error message.



The following examples show how maxSize can be used.

Blob size schema

Schema to validate a blob with a maximum size of 10 MB.

const BlobSchema = blob([
  maxSize(10 * 1024 * 1024, 'The blob must not exceed 10 MB.'),

Set size schema

Schema to validate a set with a maximum of 8 numbers.

const SetSchema = set(number(), [
  maxSize(8, 'The set must not exceed 8 numbers.'),

The following APIs can be combined with maxSize.



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