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SinatraでJSONを受け取る方法

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SinatraでJSONを受け取る方法。

結論: Rack::PostBodyContentTypeParser を使う。

やり方

rack-contribをインストールする

Gemfile
gem 'rack-contrib'

or

$ gem install rack-contrib

Rack::PostBodyContentTypeParserを有効にする

app.rb
require 'sinatra'
require 'rack/contrib'

use Rack::PostBodyContentTypeParser

post '/hoge' do
  params[:foo]
end

動作確認

$ curl -X POST -H 'Content-Type: application/json' -d '{"foo": "bar"}' http://localhost:4567/hoge

bar

ただし、リクエストのContent-Typeapplication/jsonである必要があるので注意。

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