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Convert JSON to CSV / Excel

Convert JSON (including nested objects and arrays) to flat CSV or Excel. Flattening keys are fully configurable.

100% Secure - your files are processed in your browser and never sent to a server.
Drop your file hereor click to browseSupports JSON or TXT files (.json, .txt) (Max 100MB)

How to use the Convert JSON to CSV tool

  1. Load your JSON data: Drag and drop your .json file, choose a file from your file explorer, or paste JSON directly into the paste area.
  2. Configure output settings: Choose a CSV delimiter (comma, semicolon, tab, or pipe) and toggle whether to include a header row.
  3. Convert to CSV: Click the "Convert Data" button to flatten nested JSON objects into CSV columns using dot-notation keys.
  4. Export results: Copy the results to your clipboard, download as a local file, or export to Excel format.

Frequently asked questions

Is it safe to use Convert JSON to CSV with sensitive or confidential data?
Yes, completely. All processing done by Convert JSON to CSV runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size Convert JSON to CSV can handle?
Convert JSON to CSV supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does Convert JSON to CSV process my data without uploading it?
Convert JSON to CSV uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use Convert JSON to CSV?
No installation, browser extension, or plugin is required. Convert JSON to CSV runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does Convert JSON to CSV work offline after the page has loaded?
Yes. Once Convert JSON to CSV has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

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