The first four Val Town runtimes

The first four Val Town runtimes

Val Town solves one of my favourite technical problems: how to run untrusted code in a safe sandbox. They're on their fourth iteration of this now, currently using a Node.js application that launches Deno sub-processes using the deno-vm npm package and runs code in those, taking advantage of the Deno sandboxing mechanism and terminating processes that take too long in order to protect against while(true) style attacks.

Via @tmcw

application code deno iteration javascript node node.js npm package processes runtimes technical