Azure Bicep Expressions - Parameters Variables Outputs and Functions

Bicep parameters, variables, outputs, and built-in functions are the building blocks that transform static templates into flexible, reusable infrastructure definitions. In this hands-on lab, you will explore these core expression features by deploying an Azure Key Vault with dynamically generated naming and parameterized configuration.

You will create a keyvault.bicep file in the Code IDE, defining typed parameters with decorators like @allowed, @minLength, @maxLength, @description, and @secure(). You will use variables with string interpolation and the uniqueString() function to generate a globally unique vault name. After adding outputs to expose the vault URI and name, you will deploy the template using az deployment group create and retrieve output values with az deployment group show. By the end, you will have a working Key Vault and a solid understanding of how Bicep expressions make templates dynamic and maintainable.

Objectives

Upon completing this beginner level lab, you will be able to:

• Define typed parameters with @allowed, @minLength, @maxLength, and @description decorators
• Use @secure() to protect sensitive parameter values from deployment logs
• Create variables using string interpolation and built-in functions like uniqueString(), toLower(), and resourceGroup().location
• Configure outputs to expose resource properties such as vault URI after deployment
• Deploy an Azure Key Vault with dynamically generated unique naming
• Retrieve deployment outputs using az deployment group show

Who is this lab for?

This lab is designed for:

• Cloud engineers learning Azure Bicep who want to move beyond basic resource declarations into flexible, parameterized templates
• IT professionals looking to understand how Bicep expressions enable reusable infrastructure definitions