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EJS
Embedded JavaScript templating for fast, flexible HTML generation.

EJS
Free

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What is EJS?

EJS is an embedded JavaScript templating library designed for generating HTML markup with plain JavaScript. It provides developers with a powerful yet straightforward tool for injecting data and control-flow within templates, removing the necessity for learning new syntaxes or reinventing standard programming paradigms. EJS supports rapid development, featuring intuitive scriptlet tags for easy integration of JavaScript code directly into HTML templates, along with fast compilation and execution powered by JavaScript runtimes.

With EJS, users gain flexibility through custom delimiters, robust caching strategies, sub-template includes, and support for both server-side and browser environments. The template engine integrates seamlessly with Express and provides a command-line interface (CLI) for rendering templates with data files. Its focus on simplicity, high performance, and active community development makes it suitable for both quick prototyping and large-scale production applications.

Features

  • Plain JavaScript Integration: Allows direct use of JavaScript in templates for dynamic content generation.
  • Fast Compilation and Rendering: Optimized performance through template caching and JavaScript runtimes.
  • Simple Syntax: Uses intuitive scriptlet tags for embedding code within HTML.
  • Custom Delimiters: Supports customized tag delimiters for different template styles.
  • Sub-template Includes: Enables inclusion of other templates for modular design.
  • Command-Line Interface: Ships with a CLI for template rendering and automation.
  • Server and Browser Support: Functions in Node.js environments and directly in browsers.
  • Express Compatibility: Easily integrates with the Express framework as a view engine.
  • Static Caching: Offers caching for intermediate JavaScript and templates.
  • Easy Debugging: Template errors report as standard JavaScript exceptions with line numbers.

Use Cases

  • Generating dynamic HTML pages for web applications
  • Creating reusable HTML templates with JavaScript logic
  • Rendering server-side templates in Express applications
  • Building static websites from templates and data files
  • Rapid prototyping of web interfaces
  • Automating HTML email template generation

FAQs

  • Does EJS support browser-side templating?
    Yes, EJS provides browser builds that can be included via script tags, enabling HTML generation on the client side.
  • How do custom delimiters work in EJS?
    Custom delimiters can be set per template or globally, allowing the use of different characters instead of the default <% %> scriptlet tags.
  • Is EJS compatible with Express?
    EJS fully complies with the Express view system, making it straightforward to use as an Express template engine.
  • Can EJS cache templates?
    Yes, EJS supports static caching of intermediate JavaScript functions and templates to improve performance.
  • What license does EJS use?
    EJS is licensed under the Apache License, version 2.0.

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