Rails Server Could not find a JavaScript runtime

Question

i am getting the following error. tried to search and try to install extjs, bundler etc gems still am getting the error

harsha@harshamv:~/www/simple_cms$ rails s
/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:4:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/harsha/www/simple_cms/config/application.rb:7:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in `block in <top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in `tap'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

possible duplicate of [execJs: 'Could not find a JavaScript runtime' but execjs AND therubyracer are in Gemfile](http://stackoverflow.com/questions/9202324/execjs-could-not-find-a-javascript-runtime-but-execjs-and-therubyracer-are-in) — givanse, Nov 14 '14 at 09:59

score 3 · Accepted Answer · edited May 23 '17 at 12:14

3

try to install latest nodejs.

more details can be found here ExecJS and could not find a JavaScript runtime

edited May 23 '17 at 12:14

Community

1
1

answered Nov 16 '13 at 21:07

Ivan Tarapon

219
2
4

score 1 · Answer 2 · answered Mar 29 '15 at 14:34

Ubuntu Users

I'm on Ubuntu 11.04 and had similar issues. Installing Node.js fixed it.

As of Ubuntu 13.04 x64 you only need to run:

 sudo apt-get install nodejs

This will solve the problem.

CentOS/RedHat Users

 sudo yum install nodejs

ALTERNATE SOLUTION Just add ExecJS and the Ruby Racer in your gem file and run bundle install after.

   gem 'execjs'

  gem 'therubyracer'

Rails Server Could not find a JavaScript runtime

2 Answers2