Consume JSON API with Ruby without 3rd party libraries

gist.rb

require 'json'
require 'net/http'
require 'uri'

# Calls a JSON API via GET request, if the response status code is successful the JSON response body is parsed and returned as a hash.
def http_get_json(url, headers={}, open_timeout: 5, read_timeout: 10)
    uri = URI.parse(url)
    http = Net::HTTP::new(uri.host, uri.port)
    http.use_ssl = (uri.scheme == "https")

    http.open_timeout = open_timeout
    http.read_timeout = read_timeout

    request = Net::HTTP::Get.new(uri.request_uri)

    request["Content-Type"] ||= "application/json"
    request["Accept"] ||= "application/json"

    headers.each do |key, value|
        request[key] = value
    end

    response = http.request(request)

    unless response.is_a?(Net::HTTPSuccess)
        raise "HTTP #{response.code}: #{response.message}\n#{response.body}"
    end

    return JSON.parse(response.body)
end

# Calls a JSON API via POST request, if the response status code is successful the JSON response body is parsed and returned as a hash.
def http_post_json(url, payload = {}, headers = {}, open_timeout: 5, read_timeout: 10)
    uri = URI.parse(url)
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = (uri.scheme == "https")

    http.open_timeout = open_timeout
    http.read_timeout = read_timeout

    request = Net::HTTP::Post.new(uri.request_uri)

    request["Content-Type"] ||= "application/json"
    request["Accept"] ||= "application/json"

    headers.each do |key, value|
        request[key] = value
    end

    request.body = JSON.generate(payload)

    response = http.request(request)

    unless response.is_a?(Net::HTTPSuccess)
        raise "HTTP #{response.code}: #{response.message}\n#{response.body}"
    end

    return JSON.parse(response.body)
end

# Here's a sample:
response = http_get_json("https://pokeapi.co/api/v2/pokemon/pikachu")
puts response["name"]