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Editorial Team
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Asked: 2026-06-17T21:16:53+00:00

I have read some intro articles to nodejs and it seems like a fun

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I have read some intro articles to nodejs and it seems like a fun way of creating webapps. However, i’m not sure if i understand the “only one thread” and “event loop” so i hope someone can clarify for me.

Lets say i have a function “computeBigNumbers(data, callback)”. Now, when a http request is made i call this function and supply a callback for when it’s done.
In the “computeBigNumbers” function, if i don’t specifically run the code in a child process or start a web worker thread, will it be async? I’m thinking no. Correct?

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  1. Editorial Team

    In the “computeBigNumbers” function, if i don’t specifically run the code in a child process or start a web worker thread, will it be async?

    … or call another async function.

    But yes, there is only one thread in node.js, and it is your responsibility not to block it (by making time-consuming tasks explicitly asynchronous).

    I/O lends itself to callbacks, but if you have a CPU-heavy operation, then you probably need to farm it out to a web worker or child process. An intense loop in Javascript or a synchronous call into a C function will have the whole server wait for you.

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