(Ruby) Loading and Parsing a JSON Array

A JSON array is JSON that begins with "[" and ends with "]". For example, this is a JSON array that contains 3 JSON objects.

[{"name":"jack"},{"name":"john"},{"name":"joe"}]

A JSON object, however, is JSON that begins with "{" and ends with "}". For example, this JSON is an object that contains an array.

{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}

This example shows how loading a JSON array is different than loading a JSON object.

Chilkat Ruby Downloads

install from rubygems.org
gem install chilkat
or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

strJsonArray = "[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]"

strJsonObject = "{\"pets\":[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]}"

# A JSON array must be loaded using JsonArray:
jsonArray = Chilkat::CkJsonArray.new()
jsonArray.Load(strJsonArray)

# Examine the values:
i = 0
while i < jsonArray.get_Size()
    # jsonObj is a CkJsonObject
    jsonObj = jsonArray.ObjectAt(i)
    print i.to_s() + ": " + jsonObj.stringOf("name") + "\n";

    i = i + 1
end

# Output is:

# 	0: jack
# 	1: john
# 	2: joe

# A JSON object must be loaded using JsonObject
jsonObject = Chilkat::CkJsonObject.new()
jsonObject.Load(strJsonObject)

# Examine the values:
i = 0
numPets = jsonObject.SizeOfArray("pets")
while i < numPets
    jsonObject.put_I(i)
    print i.to_s() + ": " + jsonObject.stringOf("pets[i].name") + "\n";
    i = i + 1
end

# Output is:

# 	0: jack
# 	1: john
# 	2: joe