node package manager
Easy collaboration. Discover, share, and reuse code in your team. Create a free org »



Simple data wrapper that attempts to wrap SheetJS libraries to provide a uniform way to access data from Excel and other spreadsheet files:

Excel files are parsed based on the content (not by filename). For example, CSV files can be renamed to .XLS and excel will do the right thing.

Supported Formats:

Format Read Write
Excel Worksheet/Workbook Formats :-----: :-----:
Excel 2007+ XML Formats (XLSX/XLSM) ⭕️ ⭕️
Excel 2007+ Binary Format (XLSB BIFF12) ⭕️ ⭕️
Excel 2003-2004 XML Format (XML "SpreadsheetML") ⭕️
Excel 97-2004 (XLS BIFF8) ⭕️
Excel 5.0/95 (XLS BIFF5) ⭕️
Excel 4.0 (XLS/XLW BIFF4) ⭕️
Excel 3.0 (XLS BIFF3) ⭕️
Excel 2.0/2.1 (XLS BIFF2) ⭕️ ⭕️
Excel Supported Text Formats :-----: :-----:
Delimiter-Separated Values (CSV/TSV/DSV) ⭕️ ⭕️
Data Interchange Format (DIF) ⭕️ ⭕️
Symbolic Link (SYLK/SLK) ⭕️ ⭕️
Space-Delimited Text (PRN) ⭕️
UTF-16 Unicode Text (TXT) ⭕️
Other Workbook/Worksheet Formats :-----: :-----:
OpenDocument Spreadsheet (ODS) ⭕️ ⭕️
Flat XML ODF Spreadsheet (FODS) ⭕️ ⭕️
Uniform Office Format Spreadsheet (标文通 UOS1/UOS2) ⭕️
dBASE II/III/IV / Visual FoxPro (DBF) ⭕️
Other Common Spreadsheet Output Formats :-----: :-----:
HTML Tables ⭕️ ⭕️
Markdown Tables ⭕️
Other Output Formats :-----: :-----:
XML Data (XML) ⭕️
SocialCalc ⭕️ ⭕️

circo graph of format support


$ npm install -g j

Node Library

var J = require('j');

J.readFile(filename) opens the file specified by filename and returns an array whose first object is the parsing object (XLS or XLSX) and whose second object is the parsed file.

J.utils has various helpers that expect an array like those from readFile:

Format util helper
Excel 2007+ XML Formats (XLSX/XLSM) to_xlsx/to_xlsm
Excel 2007+ Binary Format (XLSB BIFF12) to_xlsb
Excel 2.0/2.1 (XLS BIFF2) to_biff2
Delimiter-Separated Values (CSV/TSV/DSV) to_csv/to_dsv
Data Interchange Format (DIF) to_dif
Symbolic Link (SYLK/SLK) to_sylk
OpenDocument Spreadsheet (ODS) to_ods
Flat XML ODF Spreadsheet (FODS) to_fods
HTML Tables to_html
Markdown Tables to_md
XML Data (XML) to_xml
SocialCalc to_socialcalc
JSON Row Objects to_json
List of Formulae to_formulae

CLI Tool

The node module ships with a binary j which has a help message:

$ j --help
  Usage: j.njs [options] <file> [sheetname]
    -h, --help               output usage information
    -V, --version            output the version number
    -f, --file <file>        use specified file (- for stdin)
    -s, --sheet <sheet>      print specified sheet (default first sheet)
    -N, --sheet-index <idx>  use specified sheet index (0-based)
    -p, --password <pw>      if file is encrypted, try with specified pw
    -l, --list-sheets        list sheet names and exit
    -o, --output <file>      output to specified file
    -B, --xlsb               emit XLSB to <sheetname> or <file>.xlsb
    -M, --xlsm               emit XLSM to <sheetname> or <file>.xlsm
    -X, --xlsx               emit XLSX to <sheetname> or <file>.xlsx
    -Y, --ods                emit ODS  to <sheetname> or <file>.ods
    -2, --biff2              emit XLS  to <sheetname> or <file>.xls (BIFF2)
    -T, --fods               emit FODS to <sheetname> or <file>.fods (Flat ODS)
    -S, --formulae           print formulae
    -j, --json               emit formatted JSON (all fields text)
    -J, --raw-js             emit raw JS object (raw numbers)
    -A, --arrays             emit rows as JS objects (raw numbers)
    -x, --xml                emit XML
    -H, --html               emit HTML
    -m, --markdown           emit markdown table
    -D, --dif                emit data interchange format (dif)
    -K, --sylk               emit symbolic link (sylk)
    -E, --socialcalc         emit socialcalc
    -F, --field-sep <sep>    CSV field separator
    -R, --row-sep <sep>      CSV row separator
    -n, --sheet-rows <num>   Number of rows to process (0=all rows)
    --sst                    generate shared string table for XLS* formats
    --compress               use compression when writing XLSX/M/B and ODS
    --perf                   do not generate output
    --all                    parse everything
    --dev                    development mode
    --read                   read but do not print out contents
    -q, --quiet              quiet mode


Please consult the attached LICENSE file for details. All rights not explicitly granted by the Apache 2.0 license are reserved by the Original Author.

Build Status

Coverage Status

NPM Downloads

Dependencies Status


Using J for diffing XLS/XLSB/XLSM/XLSX files

Using git textconv, you can use J to generate more meaningful diffs!

One-time configuration (misc/

# Define a sheetjs diff type that uses j 
git config --global diff.sheetjs.textconv "j"
# Configure a user .gitattributes file that maps the xls{,x,m} files 
touch ~/.gitattributes
cat <<EOF >>~/.gitattributes
*.xls diff=sheetjs
*.xlsb diff=sheetjs
*.xlsm diff=sheetjs
*.xlsx diff=sheetjs
*.XLS diff=sheetjs
*.XLSB diff=sheetjs
*.XLSM diff=sheetjs
*.XLSX diff=sheetjs
# Set the .gitattributes to be used for all repos on the system: 
git config --global core.attributesfile '~/.gitattributes'

If you just want to compare formulae (for example, in a sheet using NOW):

git config --global diff.sheetjs.textconv "j -S"

NOTE: There are some known issues regarding global modules in Windows. The best bet is to npm install j in your git directory before diffing.