Guitar Chord SVG Diagram Generator
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Node JS module for generating guitar chord diagrams in SVG format. Interval names are shown inside the dotted positions.

Example 1 Example 2

A <defs> element is written which contains the notes of the chord. This in turn can later be used by the user for audio previews etc.

<defs xmlns="" id="tonal">
  <style id="SvgjsStyle1101"/>
  <notes id="tonal-notes">C3:G3:B3:E4:G4</notes>
  <semitones id="tonal-semitones">8:15:19:24:27</semitones>
  <comment id="chord-comment"/>

The GitHub page may contain more up to date code than the NPM release. Please check GitHub for the most recent updates.

It uses:

  • SVG.js for SVG manipulation.
  • svgdom to allow SVG.js to run server-side.
  • tonal music theory library for determining the notes and intervals of defined chords.


You can see this library being used at



Install module:

npm install chordy-svg --save

Via Git

Clone Git repository

git clone


Node Example

Create a node application test.js. This will create a SVG diagram and write the contents to stdout.

const ChordySvg = require('chordy-svg');

const voicing = {
    name: "Cmaj7",
    shape: "x35453",
    root: 2,
    comment: ""

const svg = new ChordySvg(voicing);
const data = svg.svg();

If you've cloned the library from GitHub instead of using NPM, you'll need to replace require('chordy-svg') with the correct path, e.g require('./chordy-svg')

Create SVG and write to new file output.svg

node test.js > output.svg

Browser Example

chordy-svg.min.js is found in dist/ and can be built with npm build. Read the tests section further below with prewritten examples you can use.

    <div id="image"></div>

    <!-- use for latest build -->
    <script src=""></script>
    <script src=""></script>
    <script src="chordy-svg.min.js"></script>
    <script type="text/javascript">
        // create new svg diagram
        var element = document.getElementById('image');
        var svg = new ChordySvg({ name: "Cmaj7", shape: "x35453", root: 2, comment: "Test comment" }, { target: element });


In the example above, we used:

const voicing = {
    name: "Cmaj7",
    shape: "x35453",
    root: 2,
    comment: ""

The properties for this object are:

  • name is the name of the chord and will be displayed as a title in the SVG
  • shape is the shape of the chord, starting from the lowest / thickest string.
    • x: muted or skipped string.
    • 0: open string (open strings not properly tested yet)
    • [0-9a-f]: hexadecimal value refers to fret position. e.g b refers to fret position 11. Only up to fret position 15 (hex f) is permitted.
  • root is the root string. 0 refers to the lowest frequency / thickest string. On 6 string guitars with EADGBE tuning, 5 refers to the high E string. In the generated diagram, the dot for this position will be coloured red by default.

A second parameter to the ChordySvg() constructor may be used to set more custom parameters (documentation not complete yet).



Standalone testing (requires Mocha, you may need to run npm install mocha -g first)

git clone
cd chordy-svg
npm update
npm test

This will also generate some SVG files which you should check. Remove these files once you've finished with them.

rm -f *.svg

To publish npm package

npm run build
npm version (patch|minor|major)
npm publish
git push


Build browser targeted files dist/svg-chordy.js and dist/svg-chordy.min.js with:

npm build

View file test/test.html


Not fully tested for chords with open strings.