Essential & useful gems and library for a Rails app

For better coding

• Rubocop
• Overcommit

Debugging

• Better_errors
• Pry-byebug
• Pry-rails

Authentication & Authorization

• Devise (deprecated)
• Clearance
• OmniAuth (Authentication via social networks accounts like Google or Facebook)
• CanCanCan
• Pundit
• Rolify
• Active Admin

Performance analyzer

• PGHero: A performance dashboard for Postgres
• Skylight: To understand and act on your app’s performance data
• Bullet
• RubyCritic

Testing

• Rspec
• Database_cleaner
• Factory_girl
• Capybara
• Shoulda-matchers
• Simplecov

For development env

• Letter Opener
• Dotenv-Rails

Uploading Files

• Active Storage: Facilitates uploading files to a cloud storage service.
• CarrierWave: Provides a simple and extremely flexible way to upload files from Ruby applications
• Minimagick

Search

• Elasticsearch-model , elasticsearch-rails

Encryption

• JWT

Pagination

• Will_paginate
• Kaminari: A Scope & Engine based, clean, powerful, customizable and sophisticated paginator.

Background Job

• Delayed Job
• Sidekiq

Other some awesome gems and library

• sidekiq-cron
• ActiveModelSerializers
• Jbuilder
• Fast_jsonapi
• OJ: A fast JSON parser and Object marshaller as a Ruby gem.
• Haml, Slim-rails
• Activerecord-import
• Hashid Rails
• Flipper
• Bulk_insert
• Geocoder
• PaperTrail: Track changes to your models, for auditing or versioning.
• Groupdate: The simplest way to group by the hour, day, week, month, year etc.
• Http, Httparty

Thanks.