Fetching data from other sources is critical for modern web development. Any complex web page certainly pulls information from multiple different APIs. This can be accomplished within react with the fetch() function which can get JSON objects from APIs that your frontend can use. A simple example in the Meta course was a web page that displayed the current price of Bitcoin taken from the coindesk API. Because getting the data will take time, it is a good practice to have some conditional rendering that tells the user that their data is loading, and then display the content once it is retrieved.
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