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Heroku buildpack for Dart

branch: master

Heroku Buildpack: Dart

This is a Heroku buildpack for Dart.


  • Runs Dart VM as a server in Heroku's cloud
  • Installs packages with pub
  • Builds the client app with pub build

NOTE: The current official builds of Dart SDK do not support Heroku, due to mismatched glibc versions. You need to provide your own .tar.gz of Dart SDK, compiled for Ubuntu 10.04 (Heroku's Cedar stack). Get instructions for building Dart for Ubuntu 10.04 or you can try using an (unsupported) community build of Dart for Ubuntu 10.04.

Getting Started

(These instructions assume you have the heroku tools and git installed, and that you have a heroku account.)

Create a Heroku app with the cedar stack, specify both this buildpack and a URL to a Dart SDK compiled for Ubuntu 10.04.

$> git clone
$> mkdir myfirstdartappforheroku
$> cp -R heroku-buildpack-dart/test-app/* myfirstdartappforheroku
$> cd myfirstdartappforheroku
$> git init
$> git add -A .
$> git commit -am "first commit"
$> heroku create myfirstdartappforheroku -s cedar
$> heroku config:set DART_SDK_URL=<archive url>
$> heroku config:add BUILDPACK_URL=

Push the app to Heroku. Learn more about deploying to Heroku with git.

$> git push heroku master

Example output from a git push:

Initializing repository, done.
Counting objects: 11, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (11/11), done.
Writing objects: 100% (11/11), 2.27 KiB | 0 bytes/s, done.
Total 11 (delta 0), reused 0 (delta 0)

-----> Fetching custom git buildpack... done
-----> Dart app detected
-----> Welcome, this machine is: Linux 4d4ac1e0-412c-4734-9a68-0e0002f669cf 3.8.11-ec2 #1 SMP Fri May 3 09:11:15 UTC 2013 x86_64 GNU/Linux
-----> Installing Dart VM via URL
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10.3M  100 10.3M    0     0  5822k      0  0:00:01  0:00:01 --:--:-- 13.4M
-----> Copy Dart binaries to app root
-----> Dart cmd found at -rwx------ 1 u13180 13180 10064032 Dec 22 19:23 /app/dart-sdk/bin/dart
Dart VM version: 1.1.0-dev.4.0 (Mon Dec 16 12:29:42 2013) on "linux_x64"
-----> Dart reports version: 
*** Found pubspec.yaml in /tmp/build_c4247abc-3094-495f-870d-4e72fe1f1f36/.
*** Running pub get
Resolving dependencies.......
Downloading browser 0.9.0...
Downloading http_server 0.9.1...
Downloading mime 0.9.0...
Downloading path 1.0.0...
Got dependencies!
*** Running pub build
Building basic_http_server.......
[Info in Dart2JS]:
Took 0:00:06.587561 to compile basic_http_server|web/index.dart.
Built 8 files!
-----> Discovering process types
       Procfile declares types -> (none)

-----> Compressing... done, 10.5MB
-----> Launching... done, v6 deployed to Heroku

 * [new branch]      master -> master

Scale to one web dyno (aka server):

$> heroku ps:scale  web=1

Test your app! The URL is printed at the end of the git push step.


Location of Dart SDK

You must specify a URL that points to a .tar.gz file of the Dart SDK. The SDK must be built for a Ubuntu 10.04 environment.

$> heroku config:set DART_SDK_URL=<archive url>

There are instructions for building Dart SDK for Ubuntu 10.04.

Specifying the script

The Procfile defines the file to run when the application starts. We recommend to put the server script into your application's bin/ directory.

The sample app's Procfile looks like:

web: ./dart-sdk/bin/dart bin/basic_http_server.dart

Overriding the build command

By default pub build is launched after the pub get, it can be useful to use another command: for instance pub build --mode=debug or /app/dart-sdk/bin/dart build.dart:

$> heroku config:set DART_BUILD_CMD="/app/dart-sdk/bin/dart build.dart"

Learn more about


See test-app directory for the world simplest Dart web app running on Heroku:

Learning more

Dart VM can access files, directories, sockets, HTTP, web sockets, SSL, and more. See the dart:io library for core functionality.

Dart's package repository, pub, hosts lots of options for more functionality, such as database drivers, HTTP server frameworks, templates, and more.


The MIT License - Copyright (c) 2012 Ilya Grigorik

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