Backports.debian.org

Install Node only

Run the following (as root):

echo "deb http://ftp.us.debian.org/debian wheezy-backports main" >> /etc/apt/sources.list
apt-get update
apt-get install nodejs

Install Node and NPM

Run the following (as root):

echo "deb http://ftp.us.debian.org/debian wheezy-backports main" >> /etc/apt/sources.list
apt-get update
apt-get install nodejs-legacy
curl -L --insecure https://www.npmjs.org/install.sh | bash

Using it in a Dockerfile

You could use it in your Dockerfile like this:

FROM debian:wheezy
MAINTAINER Your Self "yourself@example.com"
# method from https://github.com/joyent/node/wiki/backports.debian.org
RUN echo "deb http://ftp.us.debian.org/debian wheezy-backports main" >> /etc/apt/sources.list \
    && DEBIAN_FRONTEND=noninteactive apt-get -y update \
    && apt-get install -y curl nodejs-legacy \
    && curl -L --insecure -O https://www.npmjs.org/install.sh \
    && /bin/bash install.sh \

An example of such Dockerfile using this