JSON to CSV & CSV to JSON Converter
Convert nested JSON arrays to CSV, TSV, and tabular spreadsheets, or parse CSV documents back into typed JSON arrays. Supports deep dot-notation flattening, custom delimiters, and RFC 4180 quotation escaping. 100% private in-browser.
JSON Array Input
CSV Spreadsheet Output
Bidirectional JSON & CSV Transformation
JSON is the standard format for web APIs, distributed services, and document databases, while CSV (Comma-Separated Values) remains the universal lingua franca for spreadsheet software (Excel, Google Sheets), data science pipelines, and SQL databases. Converting cleanly between them requires handling nested hierarchies and edge-case delimiter collisions.
Key Conversion Features
- RFC 4180 Compliance: Fields containing commas, tabs, quotes, or line breaks are wrapped in double quotation marks, and internal quotes are cleanly escaped as double-quotes (
""). - Deep Key Flattening: Deeply nested JSON structures like
{"user": {"address": {"city": "Austin"}}}are automatically unnested into dot-delimited column headers:user.address.city. - Type Inference on Ingestion: When converting CSV to JSON, numeric values (e.g.
42,3.14) are parsed into numbers,trueandfalsestrings become booleans, andnullstrings map tonull. - Flexible Delimiters: Switch seamlessly between Comma (
,), Tab-Separated Values (TSV), Semicolon (standard in European Excel exports), and Pipe (|).
Frequently Asked Questions
- Can I convert a single JSON object instead of an array?
- Yes. If you provide a single JSON object (e.g.
{"id": 1, "name": "Alice"}), the converter wraps it into a single-row spreadsheet automatically. - Does this tool work with large CSV files?
- Yes. Because execution happens in local browser memory without uploading bytes over the internet, multi-megabyte CSV and JSON documents convert rapidly.
- Are my files or spreadsheets uploaded to any server?
- No. All data manipulation executes entirely in your browser's local RAM. Your data never leaves your device.