How to Convert a Ruby Hash Object to Json

How to convert a ruby hash object to JSON?

One of the numerous niceties of Ruby is the possibility to extend existing classes with your own methods. That's called "class reopening" or monkey-patching (the meaning of the latter can vary, though).

So, take a look here:

car = {:make => "bmw", :year => "2003"}
# => {:make=>"bmw", :year=>"2003"}
car.to_json
# NoMethodError: undefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
#   from (irb):11
#   from /usr/bin/irb:12:in `<main>'
require 'json'
# => true
car.to_json
# => "{"make":"bmw","year":"2003"}"

As you can see, requiring json has magically brought method to_json to our Hash.

Ruby hash to json

If you convert hash into json then you can use .to_json it will give you hash with "/" , in your case you can not use .to_json,Instead of this you may use .as_josn,It will convert your hash without "/".
like:

<%= @my_hash.as_json %>

Ruby converting array to hash object to json

I suggest you use the method Array#product.

{ "cars": ["id"].product(ids).map { |k,v| { k=>v } } }
  #=> {:cars=>[{"id"=>111}, {"id"=>333}, {"id"=>888}]} 

or

{ "cars": ["id"].product(ids).map { |a| [a].to_h } }
  #=> {:cars=>[{"id"=>111}, {"id"=>333}, {"id"=>888}]} 

and then apply to_json.

How to convert a hash to JSON without the converted string being full of backslashes

It seems like you are confused about the actual content of the string. The backslashes are part of the string representation, and are not actually in the string.

Take for example '"' a single character ". When you enter this into irb the output will be:

s = '"'
#=> "\""

From the result "\"" the starting " and ending " mark the begin and ending of the string while \" is an escaped double quote, and represents a single ". The reason this double quote is escaped is because you want Ruby to interpret it as an " character, not as the end of the string.

You can view the actual contents of the string without escape characters by printing it to the console.

puts s
# "
#=> nil

Here you can see that there is no backslash in the contents of the string.

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The same applies for your to_json call, which returns a string:

data = {"a" => "b", "c" => "d", "e" => "f"}
json = data.to_json
#=> "{\"a\":\"b\",\"c\":\"d\",\"e\":\"f\"}"
puts json
# {"a":"b","c":"d","e":"f"}
#=> nil

Like you can see there are no backslashes in the contents of the string, only in the string representation.

How to convert ruby formatted json string to json hash in ruby?

You can try eval method on temp json string

Example:

eval(temp)

This will return following hash

{"accept"=>"*/*", "host"=>"localhost:4567", "version"=>"HTTP/1.1", "user_agent"=>"curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3", "http_token"=>"375fe428b1d32787864264b830c54b97"}

Hope this will help.

Thanks

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