Most deploy errors are the same dozen failures
The error text changes, but the causes don't: a port collision, an app bound to 127.0.0.1 instead of 0.0.0.0, a missing dependency that was installed locally but not in the build, a secret that isn't set in prod, or a container that runs out of memory and gets killed. This tool matches your paste against the most common ones and gives you the specific fix — not a forum thread.
The pattern behind the 502
The single most-Googled deploy failure — "works locally, 502 in production" — is almost always one of three things: the app listens on the wrong interface, listens on the wrong port, or crashed on startup. The platform's proxy gets nothing back and returns a 502. Bind 0.0.0.0:$PORT, keep the process up, and read the startup logs.
Decode the error here. Stop shipping it in the first place.
Infraveil is a control plane you run on your own servers. Its deploy gate runs your healthcheck and catches a process that won't bind, won't stay up, or is missing a secret before the change goes live — with one-click rollback and a tamper-evident record of every deploy. The 502 you just decoded becomes a deploy that simply doesn't ship broken.
See the live demo →Frequently asked questions
What does EADDRINUSE mean?
The port your app binds is already taken — a stale instance, two processes on one port, or a hardcoded port. Bind process.env.PORT, run one instance, kill the stale process.
Why does it work locally but 502 in production?
The proxy can't reach your app: bound to 127.0.0.1 not 0.0.0.0, wrong port, or it crashed on boot. Bind 0.0.0.0:$PORT and check startup logs. Full 502 guide →
What is CrashLoopBackOff?
Kubernetes restarting a container that keeps crashing. Read the previous container's logs — it's usually a bad start command, missing env/secret, failed dependency, or OOM.
How do I stop shipping these at all?
Gate deploys behind a healthcheck so a process that won't bind or stay up never goes live, with instant rollback. That's what Infraveil does →