JSON to CSV Converter Online

Convert JSON arrays to CSV format for spreadsheets and data analysis, or convert CSV data back to JSON for API integration and programmatic use. Handles nested objects by flattening them with dot notation, supports custom delimiters, and auto-generates header rows from JSON keys. Useful for exporting API responses into Excel, converting database query results for reporting, and preparing data for import into other tools. Everything runs in your browser — no file uploads, no sign-up required.

• Bidirectional conversion — convert JSON arrays to CSV for spreadsheets, or CSV tables back to JSON for APIs.
• Handles nested objects — deeply nested JSON keys are flattened using dot notation (e.g. address.city becomes a column header).
• Auto-generates headers from JSON keys — no need to manually specify column names.
• Copy or download result — grab the output as text or save it as a .csv or .json file.
• Completely private — your data never leaves your browser. Safe to convert sensitive records.

• 💡JSON arrays of flat objects (no nesting) convert most cleanly to CSV. Each object becomes a row, and each key becomes a column header.
• 💡Nested objects are flattened with dot notation — {address: {city: 'Paris'}} becomes address.city as a column header. Deep nesting can produce many columns.
• 💡Arrays within JSON objects (e.g. tags: ['a', 'b', 'c']) are converted to comma-separated strings within a single CSV cell.
• 💡When converting CSV to JSON, the first row is treated as the header row and becomes the key names in each JSON object.