SpecGate – Validate API responses against OpenAPI in real-time

Hacker News

Hey HN, Over the years, I've built quite a few OpenAPI specs that'd get neglected over time and where the endpoints would eventually drift away from the spec. I wanted to build something super lightweight that I could drop in during development to double check that my endpoints still match the spec as expected. SpecGate is a lightweight proxy that checks API responses against the given OpenAPI spec. It'll tell you if there's an undocumented endpoint or if the response doesn't match the spec. I managed to catch about 10 issues with one of my more recent specs as soon as I started using it. It's possible to run this in production as well, but it currently only logs to stdout/stderr, so keep that in mind if you decide to run it in production. Would love to hear your feedback on this tool.

Visit product View on Hacker NewsAug 19, 2025

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Product HuntOn track for Day 1 leaderboard · Strong signals: using, open · Missing: mac, agents, macos

83%83% predicted probability of success on Product Hunt, based on ML models trained on real launch data.

best fitHighest predicted score across all platforms for this description.

Indie HackersFits the IH revenue-focused audience · Strong signals: started · Missing: supports, reddit linkedin, podcasting

65%65% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.

Hacker NewsStrong engagement from HN community · Strong signals: ide, io · Missing: https docs, excited, just released

60%60% predicted probability of success on Hacker News, based on ML models trained on real launch data.

nativeThis product was originally launched on this platform.

TrustMRRLess likely to generate early MRR · Strong signals: way · Missing: mobile apps, ios, personal

39%39% predicted probability of success on TrustMRR, based on ML models trained on real launch data.

AppSumoMay struggle as an AppSumo deal · Strong signals: soon · Missing: plus, platform, intuitive

29%29% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue

20%20% predicted probability of success on Acquire.com, based on ML models trained on real launch data.

BetaListMay not resonate with beta-testers · Missing: web3, chat, crypto

1%1% predicted probability of success on BetaList, based on ML models trained on real launch data.

Incorrect prediction on native model

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