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This blog assumes you've read the first three parts of the series or are familiar with basic command line, async Javascript, and HTTP messages. You can view all of the code for this series in the Github repository.
On Github
To check if CORS is allowed, I build a GET request to an API using axios in my client first. When I run it, I get this error in the DevTools console:
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.