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Utility for working with Closure Templates, aka Soy, from with a node.js application.

branch: master


Utility for working with Closure Templates, aka Soy, from within a node.js application. Supports dynamic recompilation and loading for fast iteration during development.



  1. Fork, clone or download the source from GitHub, or
  2. Install via NPM using npm install soynode


var soynode = require('../lib/soynode')

    outputDir: '/tmp/soynode-example'
  , allowDynamicRecompile: true

soynode.compileTemplates(__dirname, function (err) {
  if (err) throw err
  // Templates are now ready to use.
  console.log(soynode.render('example.message.hello', {
      name: process.env.USER
    , date: new Date().toLocaleTimeString()

Also, see examples/example.js.

soynode.get(templatename) - Returns a JS function corresponding to the template name.

soynode.render(templatename, data) - Returns a string that results from executing a template.

soynode.setOptions(opts) - Change the options, see section below.

soynode.compileTemplates(dir, callback) - Compiles and loads all .soy files in the directory.

soynode.loadCompiledTemplates(dir, callback) - Loads already compiled templates.

soynode.loadCompiledTemplateFiles(files, callback) - Loads already compiled templates.

Where "template name" is referred to, it means the namespace + template name as defined in the Soy file, and the full JS name that the Soy Compiler generates, for example project.section.screen. See the Hello World JS doc on the Closure site for more background.


Options can be set via soynode.setOptions(options), the keys can contain the following:

  • tmpDir {string} Path to a directory where temporary files will be written during compilation. {Deprecated: use outputDir} [Default: /tmp/soynode]
  • outputDir {string} Path to a directory where files will be written. [Default: null]
  • uniqueDir {boolean} Determines whether the compiled files will be placed in a unique directory. [Default: true]
  • allowDynamicRecompile {boolean} Whether to watch for changes to the templates. [Default: false]
  • eraseTemporaryFiles {boolean} Whether to erase temporary files after a compilation. [Default: false]
  • concatOutput {boolean} Whether the compiled soy.js files should be joined into a single file. This is helpful for loading templates in a browser and simplest to use when outputDir is explicitly set and uniqueDir is false. [Default: false]
  • concatFileName {string} File name used for concatenated files, only relevant when concatOutput is true, ".soy.concat.js" is appended, so don't include ".js" yourself. [Default: compiled]

NOTE: Options should be set before templates are loaded or compiled.

Implementation Notes

The templates are loaded using Node's VM Module. This allows us to execute the generated .soy.js files as is without a post processing step and without leaking the template functions into the global scope.

Calling soynode.get executes code which returns a reference to the template function within the VM Context. The reference is cached, providing a 10x speed up over fetching the template function each time, or evaluating it in place and returning the template output over the VM boundary.


Questions, comments, bug reports, and pull requests are all welcome. Submit them at the project on GitHub.

Bug reports that include steps-to-reproduce (including code) are the best. Even better, make them in the form of pull requests.


Dan Pupius (personal website), supported by The Obvious Corporation.


Copyright 2012 The Obvious Corporation.

Licensed under the Apache License, Version 2.0. See the top-level file LICENSE.txt and (

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