JSON Serialization & API Payloads

import json

payload = {
    "service": "auth-gateway",
    "enabled": True,
    "retry_delays": [1, 2, 5],
    "owner": None,
    "threshold": 99.8
}

serialized = json.dumps(payload)
print("Serialized JSON string:", serialized)

# Note conversion: True -> true, None -> null
print("Contains lowercase 'true'?", '"enabled": true' in serialized)
print("Contains lowercase 'null'?", '"owner": null' in serialized)

import json
import tempfile
from pathlib import Path

app_settings = {
    "cluster_name": "us-east-prod",
    "worker_nodes": 64,
    "ssl_enabled": True
}

with tempfile.TemporaryDirectory() as tmp:
    config_path = Path(tmp) / 'config.json'
    
    # 1. json.dump() writes directly to file
    with open(config_path, 'w', encoding='utf-8') as f:
        json.dump(app_settings, f, indent=2)
        
    # 2. json.load() reads directly from file
    with open(config_path, 'r', encoding='utf-8') as f:
        recovered = json.load(f)
        
    print("Cluster name:", recovered["cluster_name"])
    print("Worker nodes:", recovered["worker_nodes"])

import json
from decimal import Decimal

# 1. Financial exact precision
transaction_json = '{"account": "1042", "amount": 199.95}'
transaction = json.loads(transaction_json, parse_float=Decimal)
print("Amount type:", type(transaction["amount"]).__name__)
print("Exact calculation (amount * 3):", transaction["amount"] * 3)

# 2. Catching JSONDecodeError
corrupted = '{"status": "active",}'  # Invalid trailing comma!
try:
    json.loads(corrupted)
except json.JSONDecodeError as err:
    print(f"Syntax error on line {err.lineno}, col {err.colno}: {err.msg}")

import json
data = {"service": "auth", "active": True}
json_str = json.dumps(data)
print("JSON String:", json_str)

# Service integration layer
def handle_request(payload: dict) -> dict:
    return {"status": "success", "processed": True}

# High-resilience production pattern
import time

def process_stream(events: list) -> int:
    processed = 0
    for event in events:
        if event:
            processed += 1
    return processed