valid_json? check in ruby is not working

Question

I am trying to check whether the response is valid JSON. I am making HTTParty or Restclient request to some urls and checking whether the responses returned are valid JSON?

I referred the link here. This is not working.

My code:

 require 'json' def get_parsed_response(response) if not response.is_a? String or not response.valid_json? # code end end

Error:

/home/user/.rvm/gems/ruby-2.1.0/gems/httparty-0.13.1/lib/httparty/response.rb:66:in `method_missing': undefined method `valid_json?' for #<HTTParty::Response:0x00000002497918> (NoMethodError)

The link shows a definition for a function which you'd call as valid_json?(response), if you put it into your code. Also, since you'll invariably try to parse the JSON after ascertaining that it is valid, you'd just be doing the same thing twice. Just parse your JSON and rescue from an error, forget about valid_json?. — Amadan
– Amadan, Commented Nov 17, 2014 at 5:40
Why not leverage the power of unless instead of old if not? — Arslan Ali
– Arslan Ali, Commented Nov 18, 2014 at 5:08

Amadan · Accepted Answer · 2014-11-17 06:19:26Z

More specifically than in my comment, I suggest you use something like this:

value = nil begin value = JSON.parse(response) # do whatever you do when not error rescue JSON::ParserError, TypeError => e puts "Not a string, or not a valid JSON" # do whatever you do when error end

user513951 · Accepted Answer · 2016-01-14 20:58:25Z

You should be calling response.body.

response is an HTTParty::Response object. What you really want to be working with is the String object that represents the HTTP response body.

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