Initial Checks

• I have searched Google & GitHub for similar requests and couldn't find anything
• I have read and followed the docs and still think this feature is missing

Description

I searched but didn't find where/how this would be possible already, especially in a simple straightforward way.

Suppose I have a JSON string, then I can do MyModel.model_validate_json(json_str, strict=True) to validate the JSON using 'looser' JSON rules to get an instance of MyModel (as per here). How can I do exactly the same if I only have access to json.loads(json_str)?

Calling MyModel.model_validate() uses different (Python) validation rules, and MyModel.model_validate_json() only accepts the raw string. Converting the loaded JSON data back to string just to validate it again seems backwards. The feature request would be to have a simple top-level way of passing already-loaded JSON data (Python objects) through JSON-style validation rules.

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .model_dump() and .model_dump_json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - model_construct(), pickling, private attributes, ORM mode
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.