I'm really impressed by @HyperDevIt . It's like JSFiddle, but for server-side JS. It has a great UI that just invites tinkering.
miniblog.
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HyperDev is now GoMix! https://medium.com/gomix/introducing-gomix-aec205c421cb GoMix is really innovative: it's like JSFiddle but for backends, enabling real applications.