Lightweight CSV Viewer

A minimal, fast Excel-like grid for viewing and lightly editing .csv and .tsv files in VS Code — an alternative to heavier tools like Data Wrangler for people who just want to see their data in cells, search it, and filter it.

Features

• Grid view — opens .csv/.tsv files as a virtualized, spreadsheet-like table (handles large files smoothly; sticky header row and row-number gutter).
• Search — plain-text or regex search with case toggle, match count, and prev/next navigation (Cmd/Ctrl+F inside the grid).
• Filter — switch the same search box to Filter mode to show only matching rows.
• Light editing — double-click (or F2) a cell to edit it, drag column headers to reorder, right-click a header/row for delete, Cmd/Ctrl+Backspace deletes the focused row. All edits go through VS Code's normal save/undo/redo — Cmd/Ctrl+Z reverts, Cmd/Ctrl+S saves.
• Automatic delimiter detection (, ; tab |), theme-aware (light/dark/ high-contrast), no runtime dependencies.

Files over 200,000 rows open in read-only mode to keep memory bounded.

Usage

Open any .csv or .tsv file — it opens in the grid by default. To edit the raw text instead, right-click the file (or use the editor tab context menu) and choose Reopen Editor With → Text Editor.

Local install

npm install
npm run package        # produces lightweight-csv-viewer-0.1.0.vsix (via vsce)
code --install-extension lightweight-csv-viewer-0.1.0.vsix

Development

npm install
npm run watch           # esbuild in watch mode

Press F5 in VS Code (with this folder open) to launch an Extension Development Host with the extension loaded.

npm test                # parser unit tests