in

$in

Validates that a value is included in an allowed list of values. Uses strict equality (===) for comparison.

Parameters

The parameter is an array (not an object) of allowed values passed directly to the processor.

• Array of values (array, required): The allowed values to match against using strict equality

Example

// Restrict a log level to known values
new Schema('string').validator({$in: ['debug', 'info', 'warn', 'error']})

// Accept only specific HTTP methods
new Schema('string').normalizer('$uppercase').validator({$in: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH']})

// Restrict a numeric status code to expected values
new Schema('number').validator({$in: [200, 201, 204, 400, 401, 403, 404, 500]})