Software⏱️ 2 min read📅 2026-05-31

How to Fix: Heroku/devise - Missing host to link to! Please provide :host parameter or set default_url_options[:host]

Heroku Devise error fix: Set default_url_options[:host] in production environment.

Quick Answer: Set :host parameter or default_url_options[:host] in production.rb file.

📋 Table of Contents

  1. 🔧 Update Development Environment
  2. 🔧 Update Production Environment
  3. ✨ Wrapping Up

Heroku requires a custom domain for the :host parameter in devise. To fix this issue, you need to add your Heroku app's custom domain to the default_url_options.

🔧 Update Development Environment

Method 1: Set Custom Domain in Development Environment

  1. Step 1: In your environments/development.rb file, update the default_url_options to include your Heroku app's custom domain.

Example:

config.action_mailer.default_url_options = { :host => 'yourapp.herokuapp.com' }

🔧 Update Production Environment

Method 2: Set Custom Domain in Production Environment

  1. Step 1: In your environments/production.rb file, update the default_url_options to include your Heroku app's custom domain.

Example:

config.action_mailer.default_url_options = { :host => 'yourapp.herokuapp.com' }

✨ Wrapping Up

By following these steps, you should be able to resolve the Missing host to link to! error in Heroku and successfully add users with devise.

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