Ruby XML to JSON Converter?
XmlRubyJsonConverterXml Problem Overview
Is there a library to convert XML to JSON in Ruby?
Xml Solutions
Solution 1 - Xml
A simple trick:
First you need to gem install json
, then when using Rails you can do:
require 'json'
require 'active_support/core_ext'
Hash.from_xml('<variable type="product_code">5</variable>').to_json #=> "{\"variable\":\"5\"}"
If you are not using Rails, then you can gem install activesupport
, require it and things should work smoothly.
Example:
require 'json'
require 'net/http'
require 'active_support/core_ext/hash'
s = Net::HTTP.get_response(URI.parse('https://stackoverflow.com/feeds/tag/ruby/')).body
puts Hash.from_xml(s).to_json
Solution 2 - Xml
I'd use Crack, a simple XML and JSON parser.
require "rubygems"
require "crack"
require "json"
myXML = Crack::XML.parse(File.read("my.xml"))
myJSON = myXML.to_json
Solution 3 - Xml
If you wish to keep all attributes I recommend cobravsmongoose http://cobravsmongoose.rubyforge.org/ which uses the badgerfish convention.
<alice sid="4"><bob sid="1">charlie</bob><bob sid="2">david</bob></alice>
becomes:
{"alice":{"@sid":"4","bob":[{"$":"charlie","@sid":"1"},{"$":"david","@sid":"2"}]}}
code:
require 'rubygems'
require 'cobravsmongoose'
require 'json'
xml = '<alice sid="4"><bob sid="1">charlie</bob><bob sid="2">david</bob></alice>'
puts CobraVsMongoose.xml_to_hash(xml).to_json
Solution 4 - Xml
You may find the xml-to-json
gem useful. It maintains attributes, processing instruction and DTD statements.
Install
gem install 'xml-to-json'
Usage
require 'xml/to/json'
xml = Nokogiri::XML '<root some-attr="hello">ayy lmao</root>'
puts JSON.pretty_generate(xml.root) # Use `xml` instead of `xml.root` for information about the document, like DTD and stuff
Produces:
{
"type": "element",
"name": "root",
"attributes": [
{
"type": "attribute",
"name": "some-attr",
"content": "hello",
"line": 1
}
],
"line": 1,
"children": [
{
"type": "text",
"content": "ayy lmao",
"line": 1
}
]
}
It's a simple derivative of xml-to-hash
.
Solution 5 - Xml
If you're looking for speed I would recommend Ox since it's pretty much the fastest option from the ones already mentioned.
I ran some benchmarks using an XML file that has 1.1 MB from omg.org/spec and these are the results(in seconds):
xml = File.read('path_to_file')
Ox.parse(xml).to_json --> @real=44.400012533
Crack::XML.parse(xml).to_json --> @real=65.595127166
CobraVsMongoose.xml_to_hash(xml).to_json --> @real=112.003612029
Hash.from_xml(xml).to_json --> @real=442.474890548
Solution 6 - Xml
Assuming you're using libxml, you can try a variation of this (disclaimer, this works for my limited use case, it may need tweaking to be fully generic)
require 'xml/libxml'
def jasonized
jsonDoc = xml_to_hash(@doc.root)
render :json => jsonDoc
end
def xml_to_hash(xml)
hashed = Hash.new
nodes = Array.new
hashed[xml.name+"_attributes"] = xml.attributes.to_h if xml.attributes?
xml.each_element { |n|
h = xml_to_hash(n)
if h.length > 0 then
nodes << h
else
hashed[n.name] = n.content
end
}
hashed[xml.name] = nodes if nodes.length > 0
return hashed
end
Solution 7 - Xml
Simple but with heavy dependencies (active_support
); it's not much of a problem if you already are in a Rails environment.
require 'json'
require 'active_support/core_ext'
Hash.from_xml(xml_string).to_json
Else it would be probably better to use ox
or rexml
to have much lighter dependencies and more performance.