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Custom error messages
=====================
To customize the schema-level error messages that `load <marshmallow.Schema.load>` and `loads <marshmallow.Schema.loads>` use when raising a `ValidationError <marshmallow.exceptions.ValidationError>`, override the `error_messages <marshmallow.Schema.error_messages>` class variable:
.. code-block:: python
class MySchema(Schema):
error_messages = {
"unknown": "Custom unknown field error message.",
"type": "Custom invalid type error message.",
}
Field-level error message defaults can be set on `Field.default_error_messages <marshmallow.fields.Field.default_error_messages>`.
.. code-block:: python
from marshmallow import Schema, fields
fields.Field.default_error_messages["required"] = "You missed something!"
class ArtistSchema(Schema):
name = fields.Str(required=True)
label = fields.Str(required=True, error_messages={"required": "Label missing."})
print(ArtistSchema().validate({}))
# {'label': ['Label missing.'], 'name': ['You missed something!']}
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