better_errors.md

better_errors

better_errors is a Rack middleware that replaces the standard error page with a more useful one. It provides:

• Full stack trace
• Source code inspection for all stack frames (with highlighting)
• Local and instance variable inspection
• Live REPL on every stack frame

You can install it using the gem command:

gem install better_errors

or with bundler (recommended):

group :development do
  gem 'better_errors'
  # uncomment this for more advanced features:
  # gem 'binding_of_caller'
end

Then, you can use it as follows:

require 'sinatra'
require 'better_errors'

# Just in development!
configure :development do
  use BetterErrors::Middleware
  # you need to set the application root in order to abbreviate filenames
  # within the application:
  BetterErrors.application_root = File.expand_path('..', __FILE__)
end

get '/' do
  raise 'Oops! See you at the better_errors error page!'
end

More information

For more information please look at the better_errors README.