README
Mosaico - Responsive Email Template Editor
Mosaico is a JavaScript library (or maybe a single page application) supporting the editing of email templates. The great thing is that Mosaico itself does not define what you can edit or what styles you can change: this is defined by the template. This makes Mosaico very flexible.
At this time we provide a single "production ready" template to illustrate some best practice examples: more templates will come soon! Have a look at Template Language and get in touch with us if you want to make your email html template "Mosaico ready".
Live demo
On https://mosaico.io you can see a live demo of Mosaico: the live deploy has a custom backend (you don't see it) and some customization (custom Moxiemanager integration for image editing, customized onboarding slideshow, contextual menu, and some other small bits), but 95% of what you see is provided by this opensource library. You will also see a second working template there (versafluid) that is not part of the opensource distribution.
News
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More Docs from the Wiki
Build/Run with the development backend 
You need NodeJS v8.0 or higher + NPM 8.3 (because of "overrides" support in package.json you need npm 8.3 if you want to change/upgrade dependencies, but it should work with older npm, too, if you rely on package-lock.json)
Download/install the dependencies (run again if you get an error, as it probably is a race issues in npm)