CSV to JSON Converter

Convert CSV to JSON online. Detect numbers and booleans, keep leading zeros as text, nest dotted headers into objects and export arrays, keyed objects or JSON Lines.

  • Free, no sign-up
  • Runs in your browser
  • Your data stays private

How to use the CSV to JSON Converter

  1. Paste CSV or upload a file.
  2. Choose the output shape and options such as type detection and nesting.
  3. Copy or download the JSON, or explore it in the tree tab.

Why use this CSV to JSON Converter

  • Five shapesArray of objects, array of arrays, keyed by first column, column arrays and JSON Lines.
  • Safe type detectionNumbers and booleans are detected, but 007 and 16+ digit IDs stay as text.
  • Dotted headerscity.name and city.zip become a nested city object.
  • Interactive treeExplore the result in a collapsible tree view.

Frequently asked questions

How do I convert CSV to JSON?

Paste the CSV with the first row as headers. You get an array of objects.

Will numbers be converted correctly?

Yes. Plain numbers become numbers, while values like 007 stay text so no data is lost.

Can I get one JSON object per line?

Choose "JSON Lines" for newline-delimited JSON.

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