Parsing a JSON string in Ruby

Question

I have a string that I want to parse in Ruby   string      desc    someKey   someValue   anotherKey   value    main item    stats    a  8  b  12  c  10       Is there an easy way to extract the data

User · Answer

That data looks like it is in JSON format    You can use this JSON implementation for Ruby to extract it

User · Answer

This is a bit late but I ran into something interesting that seems important to contribute    I accidentally wrote this code  and it seems to work   require  yaml  CONFIG FILE   ENV  CONFIG FILE     path to a JSON config file  configs   YAML load file    CONFIG FILE    puts configs  desc    someKey     I was surprised to see it works since I am using the YAML library  but it works    The reason why it is important is that yaml comes built-in with Ruby so there s no gem install   I am using versions 1 8 x and 1 9 x - so the json library is not built in  but it is in version 2 x    So technically - this is the easiest way to extract the data in version lower than 2 0

User · Answer

This looks like JavaScript Object Notation  JSON   You can parse JSON that resides in some variable  e g  json string  like so   require  json  JSON parse json string    If you   re using an older Ruby  you may need to install the json gem     There are also other implementations of JSON for Ruby that may fit some use-cases better    YAJL C Bindings for Ruby JSON  Stream

User · Answer

It looks like a JSON string   You can use one of many JSON libraries and it s as simple as doing   JSON parse string

User · Answer

Just to extend the answers a bit with what to do with the parsed object     JSON Parsing example require  rubygems    don t need this if you re Ruby v1 9 3 or higher require  json   string      desc    someKey   someValue   anotherKey   value    main item    stats    a  8  b  12  c  10     parsed   JSON parse string    returns a hash  p parsed  desc    someKey   p parsed  main item    stats    a      Read JSON from a file  iterate over objects file   open  shops json   json   file read  parsed   JSON parse json   parsed  shop   each do  shop    p shop  id   end

User · Answer

As of Ruby v1 9 3 you don t need to install any Gems in order to parse JSON  simply use require  json    require  json   json   JSON parse    foo   bar    ping   pong    puts json  foo     prints  bar    See JSON at Ruby-Doc

User · Answer

I suggest Oj as it is waaaaaay faster than the standard JSON library   https   github com ohler55 oj   see performance comparisons here

User · Answer

Don t see any answers here that mention parsing directly to an object other than a Hash  but it is possible using the poorly-documented object class option see https   ruby-doc org stdlib-2 7 1 libdoc json rdoc JSON html   JSON parse    quot foo quot    quot bar quot   2     object class  OpenStruct  foo bar   gt  2  The better way to read that option is  quot The ruby class that a json object turns into quot   which explains why it defaults to Hash  Likewise  there is an array class option for json arrays

[ruby] Parsing a JSON string in Ruby

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