Sinatra fails to display POST data

When attempting to make an AJAX request from the client to Sinatra, I'm encountering an issue where the data isn't appearing as expected. Checking the Chrome request headers tab indicates that everything is correct on the client side:

Request Payload 
{ test: Data }

However, on the Sinatra's side of things:

  post '/api/check/:name' do
    sleep 3
    puts params.inspect
  end

Reviewing the console output:

 127.0.0.1 - - [03/Feb/2014 10:45:53] "POST /api/check/name HTTP/1.1" 200 17 3.0019
    {"splat"=>[], "captures"=>["name"], "name"=>"name"}

The post data is not showing up anywhere. What could be causing this issue?

javascriptrubyajaxsinatra

Answer №1

It is a common issue that occurs with Sinatra when parsing form data (source).

To resolve this problem, you can either utilize rack-contrib or the request.body.

A sample form parameter would appear as follows 

curl -X POST 127.1:4567/ -d "foo=bar"

Instead of using params, you have the option to directly employ request.body.read or opt for rack contrib.

Rack-Contrib

  1. Begin by installing it using gem install rack-contrib

  2. Next, require it

    require 'rack'

    require 'rack/contrib'

  3. Activate it using 

    use Rack::PostBodyContentTypeParser

By doing so, you can handle params in the usual manner for handling JSON post data. For instance:

curl -X POST -H "Content-Type: application/json" -d '{"payload":"xyz"}' 127.1:4567/

Credit for this information goes to:

  • Sinatra controller params method coming in empty on JSON post request,

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