.strict()

Returns a copy of the schema that fails when the input has a key the schema does not declare. Each unknown key produces one unrecognizedKey issue at that key’s path, with params['key']. Only SchemaValidator has this method.

Signature

SchemaValidator<O> strict({String? message, MessageBuilder? messageBuilder})

Parameters

Parameter	Type	Meaning
message	String?	Replaces the default error message.
messageBuilder	MessageBuilder?	Builds the message from the issue. message wins when both are given. See Message builders.

Issue

Code unrecognizedKey. Default message: role is not an allowed key, where role is the unknown key.

Code generation

The generator does not emit .strict(). Apply it to a generated schema where you use it: $UserSchema.strict().

Example

Hand-written

final user = l.schema({'name': l.string().required()}).strict();

Generated

final result = $UserSchema.strict().validateSchema(json, fromJson: User.fromJson);

l.schema({'name': l.string().required()}).strict().validate(input)+1-1

1. +valid: {'name': 'Ada'}
2. -invalid: {'name': 'Ada', 'role': 'admin'}role: role is not an allowed key