Yes. All 42 tools are 100% free with no signup, no ads in your face, and no hidden limits. The core tools will always be free.

Do AHX tools upload my data to a server?

No. Every tool runs entirely in your browser using JavaScript. Your data never leaves your device.

Can I use AHX offline?

Yes. Once the page has loaded, every tool works without an internet connection. AHX is installable as a PWA.

Is CSV ↔ JSON Converter free?

Yes. CSV ↔ JSON Converter is 100% free with no signup and no usage limits.

Does CSV ↔ JSON Converter upload my data?

No. CSV ↔ JSON Converter runs entirely in your browser. Your data never leaves your device.

Do I need to install anything?

No. CSV ↔ JSON Converter works in any modern web browser. Just visit the page and start using it.

AHX

CSV ↔ JSON Converter

Convert CSV to JSON and JSON to CSV. Handles headers, quotes, nested objects.

Delimiter

First row is header

CSV input

Runs entirely in your browser. No data leaves your device.

About CSV ↔ JSON Converter

Convert CSV data to JSON format, or JSON data back to CSV. Handles quoted fields with commas, newlines inside quotes, nested JSON objects (flattened for CSV), and arrays. Everything runs in your browser — your data never leaves your device. Perfect for data migration, API development, and spreadsheet imports.

Common use cases

Convert a CSV export from Excel/Google Sheets to JSON for an API
Convert JSON API response to CSV for spreadsheet analysis
Migrate data between database formats
Prepare data for import into MongoDB (JSON) from SQL (CSV)
Clean up malformed CSV with proper quote handling

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