What is JSON to CSV conversion?

JSON to CSV conversion takes an array of JSON objects and flattens them into a tabular CSV format. Object keys become column headers, and each object becomes a row. This is useful when you need to open structured API data in Excel, Google Sheets, or any other spreadsheet application for analysis or reporting.

// JavaScript — JSON array to CSV
function jsonToCsv(data) {
  const headers = Object.keys(data[0]);
  const rows = data.map(obj => headers.map(h => obj[h]).join(','));
  return [headers.join(','), ...rows].join('\n');
}

# Python — JSON to CSV
import csv, json, io
data = json.loads(json_string)
out = io.StringIO()
writer = csv.DictWriter(out, fieldnames=data[0].keys())
writer.writeheader()
writer.writerows(data)
print(out.getvalue())

Common use cases for JSON to CSV conversion

Analysts and developers convert JSON to CSV when exporting API responses for spreadsheet analysis, creating reports from database queries, preparing data for import into legacy systems that expect CSV, or sharing structured data with non-technical team members who prefer spreadsheets.