How to connect NodeJS and Java?

Question

I need for my Node application to be able to send and recieve data to/from an already running Java app or to launch Java app from Node.

So, is there a way to send data from NodeJS to Java and back?

My goal is to have something like this:

// In Java:
J2JSInterface.setReciever(msg -> System.out.println("Message from JS: " + msg));
J2JSInterface.send("Hello from Java!");

// In Java console:
// Message from JS: Hello from JS!

// In Node:
JS2JInterface.setReciever(msg => console.log(`Message from Java: ${msg}`))
JS2JInterface.send("Hello from JS!")

// In Node console:
// Message from Java: Hello from Java!

P.S.: I Tried using JNI and Node Api in one C++ library together, (code) but it won't work because Node and Java will load two independent instances of the library and these instances can't interact with each other. (or can they?)

@AhmetUğur, I think it would be too slow for my needs, but I should definitely try it... — Mrcavas
– Mrcavas, Commented May 6, 2022 at 16:10
If you can analyze the data well, websocket should be fine. take it easy — delibalta
– delibalta, Commented May 6, 2022 at 16:19

Kirby · Accepted Answer · 2022-05-09 16:45:25Z

1

I really tend to overcomplicate things...

TCP is the solution for really fast communicating. When I checked the latency, I was shocked, because it was around 0 to 1 ms. Thanks to AhmetUğur for pointing out that I could just use websockets!

edited May 9, 2022 at 16:45

Kirby

16k11 gold badges97 silver badges110 bronze badges

answered May 9, 2022 at 16:00

Mrcavas

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