Devtools server crashes on malformed webhook JSON payloads

[omerbek]

Summary

The local SNS devtools server in devtools/node/httpserver.js parses every POST body with JSON.parse(body) inside handleBody() without catching malformed JSON.

A malformed or non-JSON POST body can therefore raise an uncaught exception and terminate the devtools process instead of logging/rejecting the invalid payload.

Impact

This affects local webhook/SNS debugging: one malformed request can take down the process and require a manual restart.

Relevant code

const handleBody = (body) => {
  const envelope = JSON.parse(body)
  validator.validate(envelope, (err) => {
    // ...
  })
}

Expected behavior

Malformed JSON should be handled explicitly, for example by logging a clear error and returning a 400 response or otherwise avoiding process termination.

Possible fix

Wrap JSON.parse in a try/catch and keep SNS validation behavior unchanged for valid JSON envelopes.