Tech Savvies: How to convert existing web api to azure functions using azure functions

Pre-requisites:

Install Node js
Install npm package, run the command “ npm i -g azure-functions-cli “ in command prompt
Note Installation path of azure function cli. eg: ‘C:\Users\usrname\AppData\Roaming\npm\node_modules\azure-functions-cli’ , usrname represents your login name.

In this blog, we will use the sample available in the GitHub. It is simple webapi application that has value

controller and you can access the value controller in the http://localhost:xxxx/api/values

Step1: Create a empty Web API application with the name “MigratedAzurefunction”

Step 2: Install the below nuget packages in the package manager console to the MigratedAzurefunction project

Install-Package Microsoft.Azure.WebJobs -Version 2.0.0

Step 3: Create two folders named GetValuesHttpTrigger and PostValuesHttpTrigger and
add file named function.json to the both the folders.

Step 4: Create a class called “GetValuesHttpTrigger” and add the below content.

Step 5: Create a class called “PostValuesHttpTrigger” and add the below content.

Step 6: Add the below contents to the GetValuesHttpTrigger’s function.json

Step 7: Add the below contents to the PostValuesHttpTrigger’s function.json

Step 8: Create a file named host.json with contents below.

Step 9: Create a file named “appsettings.json” with content below.

Step 10: Setting up the properties of the azure function project, so we can debug and test in local.

Right click on “MigratedAzurefunction” project and then click properties and navigate to Web.
Select the Start external program. Enter the azure-functions-cli path of func.exe. Eg:- C:\Users\usrname\AppData\Roaming\npm\node_modules\azure-functions-cli\bin\func.exe
In Command Line argument, enter “host start”
In Working directory, enter the path of your “MigratedAzurefunction” project.eg:- E:\Karthik\Webinar-MigrateWebAPI2Azfunc\MigrateWebAPIApp\MigratedAzurefunction