Handle Express requests one at a time

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In Express, is it possible to handle requests to a single route one at a time? I have a "checkout queue," and each time a checkout is created, stock is decreased. However, a simultaneous POST request to create a checkout checks the stock before stock is decreased in the first request, which causes overselling. Note: the request only takes about 300 ms, so using Bull or any other queueing technique seems a bit over-the-top. Is there any way I can configure a route to accept requests one-at-a-time?

I am using Firestore as the datastore.

google-cloud-firestore express node.js
3 Answers

You should use blocking operations on store level like transactions for Firestore.

user_44445200
user_126318550

Node.js by its nature, is a single-threaded application so it cannot execute multiple requests at once. What happens internally in its event loop,it can add callback into an event queue.

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You can use async/await paradigm to handle multiple requests.

user_119452900
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