Handlebars.js — The Open Source Library

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GPTWeb's templating syntax is powered by Handlebars.js — a widely adopted, open source JavaScript templating library. It builds on the original Mustache templating spec and extends it with helpers, partials, and block expressions like {{#if}} and {{#unless}}. Here are a few quick facts about Handlebars.js:
~17,000+
GitHub Stars
~25M+
Weekly NPM Downloads
MIT
Open Source License
2010
First Released
It's a battle-tested, well-documented library with a massive community — which means GPTWeb's templating approach is both familiar to developers and reliable in production. You can learn more at handlebarsjs.com. GPTWeb layers its own token conventions and AI-specific extensions on top of Handlebars, giving the platform a powerful and flexible foundation for personalization across welcome messages, email campaigns, agent workflows, and more. Want to explore more about how GPTWeb works or jump into getting started?
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