API · JetBrains plugin
Idempotency Key Companion
FreeAPI Reliability
Gutter warning icon on any Java/Kotlin Spring MVC @PostMapping/ @PutMapping (or @RequestMapping(method = ...)) endpoint method with no @RequestHeader parameter for an idempotency key: the classic footgun where a retried or double-submitted POST/PUT creates a duplicate side effect (a duplicate order, a duplicate charge) because nothing in the handler recognizes "I already saw this exact re
The gap it fixes
Idempotency keys are a well-known, standard pattern (Stripe, PayPal, and most serious payment/order APIs require one) for exactly this class of bug, but nothing flags an endpoint that's missing one — it's a code-review-only discipline today, easy to forget on a new endpoint.
Facts and pricing
- Category
- API
- Pricing
- Free
- Platform
- IntelliJ-family
- First published
- 2026-08-31
- Marketplace ID
- #33788
- Repository
idempotency-key-companion- Growth
- New listing
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