A code block that parses a JSON object from an HTTP request validates it contents, and raises an error if it is invalid.

block_validate_request_content.py

from flask import (
    request
)

required_fields: [
    # Add list of required field names.
]

# Parse request data as JSON.
data = request.get_json()

# If request data is empty, raise a KeyError.
if not data: 
    raise KeyError(
        "The request body provided is empty."
    )

# Check that all required fields are present in request data.
for field in required_fields:
    if field not in data:
        # Raise a KeyError if any required field is missing.
        raise KeyError(
            f"The required field name {field} is not specified."
        )