How to parse JSON request body in Sinatra just once and expose it to all routes?

Question

I am writing an API and it receives a JSON payload as the request body.

To get at it currently, I am doing something like this:

post \'/doSomething\'         


        

Answer 1

You can parse your JSON post body as a Hash with Rack::PostBodyContentTypeParser from https://github.com/rack/rack-contrib:

require 'rack/contrib/post_body_content_type_parser'

class Api < Sinatra::Application
  use Rack::PostBodyContentTypeParser
  ...
end

You can even pass a custom block to Rack::PostBodyContentTypeParser to parse the JSON as symbols instead of strings:

a_proc = proc { |body| JSON.parse(body, symbolize_names: true, create_additions: false) }
use Rack::PostBodyContentTypeParser, &a_proc