What is mustache.js?

Mustache.js is a JavaScript library for filling in templates with real data. The idea is simple: you write a template with placeholder slots marked by double curly braces, like {{name}} or {{title}}, and then you give the library an object containing the actual values. It replaces the placeholders with the real content and gives you back the finished text. The library is called "logic-less" because your templates don't contain programming logic like if-statements or loops written as code. Instead, certain tag types handle those behaviors automatically. If you mark a section with {{#items}} and {{/items}}, the library will repeat that block for each item in a list, or skip it entirely if the list is empty. This keeps templates clean and focused on layout rather than mixing in programming logic. It works anywhere JavaScript runs: in web browsers, in Node.js on a server, or in other JavaScript environments. There are no external dependencies required, so you just install it and start using it. You can put your templates directly in HTML files, load them from separate files, or write them as plain strings in your code. The library handles HTML escaping automatically so that data containing characters like less-than signs doesn't accidentally break your HTML. It also supports partial templates, which are reusable chunks you can embed inside other templates, and custom delimiters if the double-curly-brace syntax conflicts with another tool you're using. It's a small, focused tool that solves one problem well: separating your data from the text structure that presents it.