How to Recover Azure Function App Code
Azure Function Apps are a powerful tool for creating serverless applications, but losing the underlying code can be a stressful experience. Whether due to a missing backup, accidental deletion, or unclear deployment pipelines, the need to recover code becomes critical. Thankfully, even without backups, there are ways to retrieve and reconstruct your Azure Function App code using the right tools and techniques. In this blog, we’ll guide you through a step-by-step process to recover your code, explore the use of decompilation tools, and share preventive tips to help you avoid similar challenges in the future.
Step 1: Understand Your Function App Configuration
- Go to the Azure Portal > your Function App > Development Tools > Advanced Tools (Kudu) > debug console > CMD/PowerShell > site > wwwroot > Your Function App >
function.json - From this, note the location of the compiled DLL
(scriptFile)and the entry point(Namespace.ClassName.Method).
Step 2: Retrieve the DLL File
To recover your code, you need access to the compiled assembly file (DLL).
From Kudu (Advanced Tools), navigate to the site/wwwroot/bin directory where the YourFunctionApp.dll file resides and download it.
Step 3: Decompile the DLL File
Once you have the DLL file, use a .NET decompiler to extract the source code by opening .dll file using a .Net decompiler and running the decompiler script. The decompiler I have used here is dotPeek which is a free .Net decompiler.
To Conclude, recovering a Function App without backups might seem daunting, but by understanding its configuration, retrieving the compiled DLL, and using decomplication tools, you can successfully reconstruct your code. To prevent such situations in the future you can enable Source Control to Integrate your Function App with GitHub or Azure DevOps or set backups.
We hope you found this blog post helpful! If you have any questions or want to discuss further, please contact us at transform@cloudfronts.com.
Please refer to our customer success story Customer Success Story – BUCHI | CloudFronts to know more about how we used the function app and other AIS to deliver seamless integration.
We hope you found this blog useful, and if you would like to discuss anything, you can reach out to us at transform@cloudfonts.com.
