Transform JSON arrays into downloadable CSV files, or upload a CSV and convert it to structured JSON. Handles nested objects with dot-path flattening.
JSON ↔ CSV Converter is a browser-based tool on 24Toolkit. Transform JSON arrays into downloadable CSV files, or upload a CSV and convert it to structured JSON. Handles nested objects with dot-path flattening. Our JSON ⇄ CSV Converter converts between JSON and CSV formats. JSON (JavaScript Object Notation) is used for APIs and config files. CSV (Comma-Separated Values) is used in spreadsheets and data imports. Convert JSON arrays of objects to CSV for Excel, or CSV with headers to JSON for APIs. Conversion runs entirely in your browser. Conversion runs client-side with PapaParse and the native JSON parser, so spreadsheet data and configuration objects stay within your browser. JSON arrays of objects work best for CSV output; CSV must have headers for proper JSON conversion. JSON ↔ CSV Converter is a browser-based workflow on 24Toolkit at /json-csv-converter for users who need fast, private results without installing software. Transform JSON arrays into downloadable CSV files, or upload a CSV and convert it to structured JSON. Handles nested objects
Key Features
JSON to CSV conversion
CSV to JSON conversion
100% client-side
Handles arrays of objects
No registration
How to Use
Paste your JSON (array of objects) or CSV (with headers) in the input area.
Click 'Convert JSON' to convert JSON to CSV, or 'Convert CSV' for CSV to JSON.
The result appears in the output area. Use Copy Result to copy.
Use Clear All to start over. For nested JSON, flatten first for clean CSV.
FAQ
What JSON format works best for CSV?
JSON arrays of flat objects work best. Example: [{"name":"A","age":1},{"name":"B","age":2}]. Complex nested structures may not convert cleanly.
Does CSV need headers?
Yes. For CSV to JSON conversion, the first row must be headers. They become the JSON object keys.
Does my data leave the browser during conversion?
No. JSON parsing uses the browser's native JSON.parse, and CSV generation uses the PapaParse library — both run client-side. Your data structures and spreadsheet content remain in browser memory.