Powered by Wijmo, this extension provides read-only viewers for CSV files and Excel spreadsheets within the current Visual Studio Code workspace.

This extension requires Visual Studio Code 1.23.0 or greater, as it now uses the new Webview API.

This extension no longer requires access to an external CDN, which prevented it from being used behind a firewall. This version adds settings for controlling the display format of numeric columns in CSV files. It also includes fixes for compatibility with other CSV file extensions. See the changelog for details.

For files with a .csv, .tsv, or .tab extension, use the explorer context menu or editor title menu to invoke the Open Preview command. The contents of the file will be displayed in a FlexGrid control, which supports sorting and filtering via its column headers.

For .tsv and .tab files, a tab delimiter is assumed. For plain text files with different extensions, open the file in an editor and execute the CSV: Open Preview command from the command palette.

For files with an .xlsx or .xlsm extension, use the explorer context menu or editor title menu to invoke the Open Preview command. The contents of the file will be displayed in a FlexSheet control. If multiple sheets are present, use the controls at the bottom of the view for navigation.

The extension automatically stores user customizations on a per-file, per-workspace basis. For CSV files, this includes column widths, sort/filter criteria, data types, format strings, and scroll bar positions. For Excel files, this includes the selected sheet index, sort/filter criteria, and scroll bar positions associated with that sheet only. As of version 2.0.16, if the column structure of a CSV file changes, any persistent data is ignored for that file. This fixes issues where new columns were not displayed unless the file was moved or renamed.

To discard persistent data for a CSV or Excel file, execute the command CSV: Clear Preview State. The preview will be refreshed automatically.

Since version 2.0.21 contains bug fixes that depend upon revised column structure, any persistent data for CSV/Excel files saved with earlier versions will be ignored.

Version 2.1.22 added new settings for controlling the display format of numeric columns. By default, numeric formatting is enabled for CSV files, and the extension will examine the first row of data to determine which columns are numeric. The setting csv-preview.numberFormat specifies a .NET-style format string that controls the display type and significant digits for all numeric columns. This setting defaults to g2, which specifies two significant digits and does not display a thousands separator.

Set csv-preview.formatValues to false to turn off numeric formatting and treat all values as strings.

Since data types and format strings are persisted along with other column properties, you may need to run the CSV: Clear Preview State command to see the effects of changing the csv-preview.formatValues and csv-preview.numberFormat options.

To change the default configuration settings for the Excel Viewer extension, edit the user or workspace settings as described here. The available settings are as follows:

Any open CSV/Excel previews will automatically update to reflect the modified settings, except where noted in the previous section.

• About Wijmo
• FlexGrid API
• FlexSheet API