I would suggest, visual studio for Apigee proxy.
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You can try community tool Apigee Lint . You can refer “Rules” section to see all the code checks performed by the tool.
The tools is built using nodejs and you have all the options to customize the tool as per your organizational standards and requirement.
You can create a UI from where proxy/ shared flows can be uploaded and with one click the code review can be generated in a report/ mail.
Let me know if you have any query or looking for more information.
Thanks,
KP
Hey! If you’re looking for a tool to analyze Apigee code, you might want to check out the one I’m developing. It helps identify not only code-style errors but also potential security vulnerabilities in your Apigee API proxies.
You can learn more about it here, and see the list of current rules here (there are 33 right now, but I’m actively adding more). You can also check a sample report, or ask me to scan your proxy 
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