如何在ruby中将ruby格式的json字符串转换为json哈希？

Question

I want to access json string like hash object so that i can access json using key value like temp["anykey"] . How to convert ruby formatted json string into json object?

I have following json string

temp = '{"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"}'

Answer 1

Do you know about JSON.parse ?

require 'json'

my_hash = JSON.parse('{"hello": "goodbye"}')
puts my_hash["hello"] => "goodbye"

Answer 2

if your parse this string to ruby object, it will return a ruby Hash object, you can get it like this You can install the json gem for Ruby

gem install json

You would require the gem in your code like this:

require 'rubygems'
require 'json'

Then you can parse your JSON string like this:

ruby_obj = JSON.parse(json_string)

There are also other implementations of JSON for Ruby:

• YAJL C Bindings for Ruby
• JSON::Stream

Answer 3

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

Answer 4

To convert a Ruby hash to json string, simply call to_json.

require 'json'

temp = {"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"}
temp.to_json