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I'm using angular7, Node.js and mySQLto create a platform, each one of them runs on a seperate port and I'm only using HTTP protocol , I'm really confused if it's a 3 tier architecture (client, web server, DB) or 4 tier architecture (client, web server, application server, DB)

computer tricks
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    it seems 4 tier to me but usually, multi-tier architecture involves separate platform/system for each tier instead of on platform/system with different port. – Vipul Patil Jul 08 '20 at 13:24

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