Easier way to curl a JSON-RPC endpoint

ggurl.rb

#!/usr/bin/env ruby
require 'json'

# Check if 'jo' command exists
unless system('which jo > /dev/null 2>&1')
  puts "Error: 'jo' command not found. Please install it using:"
  puts "  brew install jo"
  exit 1
end


def usage
  puts <<~USAGE
    Usage: ggurl <url> <method> [params...]
    
    Makes JSON-RPC calls to Avalanche nodes
    
    Arguments:
      url     - API endpoint (if starts with /, NODE_URL env var will be prepended)
      method  - JSON-RPC method name
      params  - Optional key=value parameters for the method (processed using 'jo')
    
    Environment:
      NODE_URL - Base URL of the node (e.g. https://api.avax.network)
    
    Examples:
      ggurl /ext/info info.getNetworkID
      ggurl /ext/bc/C/rpc eth_chainId
      ggurl /ext/bc/P platform.getCurrentValidators subnetID=abc123

      Use -s before a key to force a string type
      ggurl /ext/bc/C/rpc eth_getBalance "-s params[]=0x09167154e444884B06d6608CE842Ddc3a768b22a params[]=latest"
  USAGE
  exit 1
end

# Show usage if not enough arguments
usage if ARGV.length < 2

url = ARGV.shift
# If url starts with /, prepend NODE_URL (or mainnet) from env
if url.start_with?('/')
  url = "#{ENV['NODE_URL'] || 'https://api.avax.network'}#{url}"
end

method = ARGV.shift

params = {id: '0', jsonrpc: '2.0', method: method}

# Process params using 'jo' 
# https://github.com/jpmens/jo/blob/master/jo.md
args = ARGV.empty? ? "" : `jo -- #{ARGV.join(' ').to_s}`

# Parse args as JSON and merge with params if not empty
params.merge!(JSON.parse(args)) unless args.strip.empty?


cmd = "curl --silent --json '#{params.to_json}' '#{url}'"
puts `#{cmd} 2>&1`