2025-03-17
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Njong Emy
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Mar 17, 2025 â‹… 8 min read

A complete guide to Fetch API in JavaScript

Njong Emy Njong is currently pursuing a bachelor's degree in computer engineering. In her spare time, she enjoys frontend development, open source projects, and movies :)

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One Reply to "A complete guide to Fetch API in JavaScript"

  1. Nice basic overview.
    I’m not convinced the streaming example would work as expected when there’s enough data to cause the parse code to be called more than once. 2 reasons: firstly, it looks like the json would be an array of objects so parsing incomplete data would fail (most likely result would abruptly end in the middle of an object definition, but would certainly be missing the array closing ] char). Secondly, even if the parse did somehow succeed, you’re parsing the entirety of result every time and adding all todos. So the second parse would include all the todos from the first parse and add them again.
    I think you’d need to do some text matching to cut ‘todo’ patterns, from result, wrap them in [] and then parse. Or simply parse when the stream is complete.
    Cheers.

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