type string|null with format fails validation for cli utility but not in python directly #571
Description
Given the following schema:
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "some_date": { "type": ["string", "null"], "format": "date-time" } }, "required": ["some_date"], "additionalProperties": false } And the following json:
{ "some_date": null } I would expect validation to pass. However it tells me "None is not a 'date-time'":
❧ check-jsonschema --schemafile nullable.schema.json nullable-null.json Schema validation errors were encountered. nullable-null.json::$.some_date: None is not a 'date-time' I would expect it to pass validation since it does when run through the underlying python library:
from jsonschema import validate from jsonschema import Draft202012Validator schema = { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "some_date": { "type": ["string", "null"], "format": "date", }, }, "required": ["some_date"], } objs = [ {"some_date": None}, {"some_date": "adiofns"}, # included to show that it will error on a string with the incorrect format {"some_date": "2023-10-01"}, ] for obj in objs: try: validate(obj, schema, format_checker=Draft202012Validator.FORMAT_CHECKER) except Exception as e: print(f"---\nValidation failed for {obj}: {e}") else: print(f"---\nValidation succeeded for {obj}") ❧ python nullable.py --- Validation succeeded for {'some_date': None} --- Validation failed for {'some_date': 'adiofns'}: 'adiofns' is not a 'date' Failed validating 'format' in schema['properties']['some_date']: {'type': ['string', 'null'], 'format': 'date'} On instance['some_date']: 'adiofns' --- Validation succeeded for {'some_date': '2023-10-01'}