Node.js

Summary

Item	Value
API name	nodejs
source OCI image	node:22-alpine
per-job resource ceiling	1 vCPU, 512 MiB

The vCPU and RAM ceiling exists to prevent abuse; libkrun memory is elastic and the host only pays for what the guest touches.

Warmup

None: the official image already ships everything needed.

How the code is executed

The main file (the first in files) is executed with node <file>. The other files sit in the same directory and can be loaded with require. Everything runs in a directory under /tmp (tmpfs), in a fresh VM destroyed at the end of the job, with no network — npm install does not work inside the job.

Building the image

rc image build --stack nodejs

Example

curl -s http://127.0.0.1:8080/api/v1/run \
  -H 'Content-Type: application/json' \
  -d '{
    "language": "nodejs",
    "files": [
      {"name": "main.js", "content": "let d = \"\";\nprocess.stdin.on(\"data\", c => d += c);\nprocess.stdin.on(\"end\", () => console.log(d.trim().toUpperCase()));\n"}
    ],
    "stdin": "abc"
  }'

Expected stdout: ABC.