Safe JSON Ingestion and Error Handling in Python

Question

Write a function that accepts a list of raw JSON strings, parses valid payloads into dictionaries, logs/ignores invalid JSON lines gracefully, and returns all successfully extracted user IDs.

Accepted Answer

Optimal Solution:
import json

def extract_valid_user_ids(raw_payloads: list[str]) -> list[int]:
    valid_ids = []
    for line in raw_payloads:
        try:
            data = json.loads(line)
            if 'user_id' in data:
                valid_ids.append(data['user_id'])
        except (json.JSONDecodeError, TypeError):
            # Continue gracefully on corrupt records
            continue
    return valid_ids

Technical Explanation:
A `try-except (json.JSONDecodeError, TypeError)` block intercepts syntax errors from malformed input lines without crashing the program.