javascript - In Node.js, how do I make one server call a function on another server? - Stack Overflow

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Let's say I have 2 web servers. Both of them just installed Node.js and is running a website (using Express). Pretty basic stuff.

How can Server-A tell Server-B to execute a function? (inside node.js)

Preferably...is there a npm module for this that makes it really easy for me?

Let's say I have 2 web servers. Both of them just installed Node.js and is running a website (using Express). Pretty basic stuff.

How can Server-A tell Server-B to execute a function? (inside node.js)

Preferably...is there a npm module for this that makes it really easy for me?

• javascript
• node.js
• ipc
• rpc

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4 Answers 4

Sorted by: Reset to default 16

How can Server-A tell Server-B to execute a function?

You can use one of the RPC modules, for example dnode.

Check out Wildcard API, it's an RPC implementation for JavaScript.

It works between the browser and a Node.js server and also works between multiple Node.js processes:

// Node.js process 1

const express = require('express');
const wildcardMiddleware = require('@wildcard-api/server/express');
const {endpoints} = require('@wildcard-api/server');

endpoints.hello = async function() {
  const msg = 'Hello from process 1';
  return msg;
};

const app = express();
app.use(wildcardMiddleware());

app.listen(3000);

// Node.js process 2

const wildcard = require('@wildcard-api/client');
const {endpoints} = require('@wildcard-api/client');

wildcard.serverUrl = 'http://localhost:3000';

(async () => {
  const msg = await endpoints.hello();
  console.log(msg); // Prints "Hello from process 1"
})();

You can browse the code of the example here.

You most likely want something like a JSON-RPC module for Node. After some quick searching, here is a JSON-RPC middleware module for Connect that would be perfect to use with Express.

Also, this one looks promising too.

Update : The library I've made & linked below, isn't maintained currently. Please check out the other answers on this thread.

---

What you need is called RPC. It is possible to build your own, but depending on the features you need, it can be time consuming.

Given the amount of time I had to invest, I'd recommend finding a decent library that suits your purpose, instead of hand rolling. My usecase required additional complex features like selective RPC calls, for which I couldn't find anything lightweight enough, so had to roll my own.

Here it is https://github.com/DhavalW/octopus.

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