Deprecation warning: See for new link -React Getting Started — The MERN Stack Tutorial!
Bryan Gilbraith

Hi Bryan, thanks for this great tutorial. I’m new to React and it really helped me to understand the basics. However, I have some problem. The warning message “ Each child in an array or iterator should have a unique “key” prop…’” keeps appearing each time I add a comment for the first time my app is running. It also happens when I use your code from Github and I can’t find why.

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