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An extension that allows inspection of Svelte component hierarchy and state in the Firefox and Chrome developer tools.
HTML JavaScript
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Latest commit 9d5b4f2 Oct 14, 2019
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dest Profiler Oct 13, 2019
scripts Cache mtimes in format script Jun 11, 2019
src Move VisibilityButton Oct 14, 2019
test Basic slot handling Sep 12, 2019
.gitignore Factor out svelte listener Jun 15, 2019
LICENSE Create LICENSE Sep 24, 2019 Update Oct 7, 2019
package.json Version 1.1.1 Oct 8, 2019
rollup.config.js Profiler Oct 13, 2019
screenshot.png New screenshot Oct 5, 2019
zen Basic component tree rendering May 23, 2019

Svelte DevTools

Mozilla Add-on Chrome Web Store

Install from the Firefox addon page or the Chrome addon page

Svelte Devtools is a Firefox and Chrome extension for the Svelte javascript framework. It allows you to inspect the Svelte state and component hierarchies in the Developer Tools.

After installing you will see a new tab in Developer Tools. This tab displays a tree of Svelte components, HTMLx blocks, and DOM elements that were rendered on the page. By selecting one of the nodes in the tree, you can inspect and edit its current state in the panel to the right.

Requires svelte version 3.12.0 or above

1.1.0 Screenshot

Build from source


Clone this repository and run the package script.

git clone
cd svelte-devtools
npm install
npm run package

This should build the codebase and output a zip file under web-ext-artifacts.



Unsigned addons can't be install in firefox permanently but addons can be installed temporarily.

  1. Navigate to about:debugging.
  2. Click "Load Temporary Add-on" and choose the generated zip file.


  1. Navigate to chrome://extensions/.
  2. Turn on developer mode using the 'Developer mode' switch in the upper right hand corner of the page.
  3. Click 'Load Unpacked' and select the dest directory.
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