JSON → CSV 변환기

import csv
import json
import io

data = [
    {"name": "Alice", "age": 30, "city": "New York"},
    {"name": "Bob",   "age": 25, "city": "London"},
]

# Using csv.DictWriter
with open("output.csv", "w", newline="", encoding="utf-8") as f:
    if data:
        writer = csv.DictWriter(f, fieldnames=data[0].keys())
        writer.writeheader()
        writer.writerows(data)

# Using pandas (recommended for complex data)
import pandas as pd
df = pd.DataFrame(data)
df.to_csv("output.csv", index=False)

# From JSON string
json_str = '[{"x": 1, "y": 2}, {"x": 3, "y": 4}]'
df = pd.read_json(json_str)
csv_output = df.to_csv(index=False)
print(csv_output)