Azure RBAC Role Definition Builder

About This Tool

The Azure RBAC Role Definition Builder helps you create custom role definitions for Azure Role-Based Access Control. While Azure provides hundreds of built-in roles, many organizations need custom roles that grant precisely the permissions required for specific job functions. This tool guides you through selecting actions, data actions, and assignable scopes, and generates the JSON role definition you can deploy via the Azure CLI, PowerShell, or ARM templates.

When to Use This Tool

• •Build a custom role that grants read-only access to specific Azure resource types while excluding access to sensitive resources.
• •Create a deployment operator role that can manage resources within a resource group but cannot modify IAM or networking.
• •Design a monitoring role that grants access to diagnostic logs and metrics without allowing resource modifications.
• •Generate custom roles with data plane permissions for services like Storage Blobs, Key Vault, or Service Bus.

Frequently Asked Questions

When should I create a custom RBAC role instead of using a built-in role?

Create a custom role when no built-in role provides exactly the permissions you need. If a built-in role grants too many permissions (violating least privilege) or too few (requiring multiple role assignments), a custom role is the better approach. Custom roles are also useful for compliance scenarios requiring precise permission documentation.

What is the difference between Actions and DataActions?

Actions control management plane operations like creating, modifying, or deleting Azure resources. DataActions control data plane operations like reading blobs in a storage account, sending messages to a queue, or reading secrets from Key Vault. A custom role can include both types.

How many custom roles can I create?

Each Microsoft Entra tenant supports up to 5,000 custom roles. Custom roles can be scoped to management groups, subscriptions, or resource groups using the assignableScopes property.