Grape

# config.ru
require "appsignal" # Add this require

# Load the Grape integration
Appsignal.load(:grape)

# Add the AppSignal Rack event middleware
# AppSignal for Ruby gem 4.7+ required
use Appsignal::Rack::EventMiddleware

# Require the app
require_relative "api"

# Start AppSignal
Appsignal.start

# Start the app
run Acme::API

# api.rb

module Acme
  class API < Grape::API
    # Add this line
    insert_before Grape::Middleware::Error, Appsignal::Rack::GrapeMiddleware # Include this middleware

    # ...
  end
end

# config.ru
require "appsignal/integrations/grape" # Add this require

# Configure AppSignal
Appsignal.config = Appsignal::Config.new(
  Dir.pwd,        # The root of your app
  ENV["RACK_ENV"] # The environment of your app (development/production)
)
# Start AppSignal
Appsignal.start_logger # Not required in Ruby gem 3.9.3+
Appsignal.start

# Add the AppSignal Rack EventHandler
# AppSignal for Ruby gem 3.8+ required
use ::Rack::Events, [Appsignal::Rack::EventHandler.new]

# Require the app
require_relative "api"

# Start the app
run Acme::API

# api.rb

module Acme
  class API < Grape::API
    # Add this line
    insert_before Grape::Middleware::Error, Appsignal::Grape::Middleware # Include this middleware

    # ...
  end
end

get "/" do
  env["grape.skip_appsignal_error"] = true # Add this line to an endpoint or callback
  raise "uh oh" # Example error, don't copy this
end

class Api < ::Grape::API
  insert_before Grape::Middleware::Error, Appsignal::Grape::Middleware

  format :json

  rescue_from :all do |error|
    Appsignal.report_error(error)
    error!({ :error => "error message" }.to_json, 500)
  end
end