First ssh in to pi and cd in to Downloads directory.
$ cd ~/Downloads
Next you need to download the nodejs tar. Checkout the version you desire http://nodejs.org/dist/ make sure you download the the version with the last string ending ‘linux-armv6l.tar.gz’. Raspberry Pi Zero support only ARMv6.
$ wget http://nodejs.org/dist/v6.10.3/node-v6.10.3-linux-armv6l.tar.gz
Once downloaded cd in to usr/local
cd /usr/local
Extract tar here
sudo tar xzvf ~/Downloads/node-v6.10.3-linux-armv6l.tar.gz --strip=1
And finally remove default npm, node and nodejs.
sudo apt-get remove --purge npm node nodejs
Now check the version
$node -v && npm -v
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