Question

I have a 2d array in javascript which I have to send to sinatra and store using datamapper,
I’ve been trying to put them in forms, but its a bit difficult to do it with forms, can I send an array to sinatra and process it?

Answer 1

You can send it to Sinatra encoding the content as a JSON string and passing it using the body part of a POST request.

Here’s how the string should look like.

require 'json'
JSON.dump([[1,2,3], [4,5,6], [7,8,9]])
# => "[[1,2,3],[4,5,6],[7,8,9]]" 

Send the content to Sinatra (using curl or any other HTTP library)

$ curl -d "[[1,2,3],[4,5,6],[7,8,9]]" http://localhost:3000/loader

Then instruct Sinatra to handle the path

post '/loader' do
  json = JSON.load(request.body.read)
  # ... do something with json
end

Note. I haven’t tried the code actually, so you might need small changes to make it working. This is just a prototype.