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node-opencpu is a OpenCPU client.


var opencpu = require("opencpu");

opencpu.rCall("/library/datasets/R/mtcars/json", {}, function (err, data) {
    if (!err) {
        console.log(data[0].mpg + data[1].mpg); // => 42
    } else {
        console.log("opencpu call failed.");

opencpu.rCall("/library/stats/R/rnorm/json", {
    n: 42,
    mean: 10,
    sd: 10
}, function (err, data) {
    if (!err) {
        console.log(data.length); // => 42
    } else {
        console.log("opencpu call failed.");



To install with npm:

npm install opencpu

Tested with Node.js 5.x and OpenCPU 1.5.1 (with R 3.2.3).

Don't forget to start the opencpu server. For instance, from R console, after installing the package opencpu. The OpenCPU server will automatically be started when the opencpu package is attached. By default, the server starts at a random port. The default port used by node-opencpu is 5307.

> library(opencpu)
Initiating OpenCPU server...
Creating new config file: C:\Users\icebox\Documents/.opencpu.conf
OpenCPU started.
[httpuv] http://localhost:5985/ocpu
OpenCPU single-user server ready.
> opencpu$stop()
OpenCPU stopped.
> opencpu$start(5307)
Using config: C:\Users\icebox\Documents/.opencpu.conf
OpenCPU started.
[httpuv] http://localhost:5307/ocpu
Warning message:
closing unused connection 3 (<-icebox-vpcz1:11823)