01API fundamentals
Workspace Invite Handler
Repair an invite endpoint with normalization, duplicate detection, and retry-safe server failures.
- validation
- request body
- duplicates
- retries
50 minStart
Free Node.js API practice
Build dependable API instincts.
Practice the Node.js decisions frontend engineers meet in full-stack interviews: HTTP contracts, validation, permissions, dependency failures, webhooks, and idempotency.
8
Free challenges
02API fundamentals
Release List Pagination
Repair a release-list handler so filtering, bounded pagination, and response metadata stay consistent for every request.
- pagination
- query params
- api contracts
45 minStart
03API fundamentals
Project Action Authorization
Repair project authorization across tenant boundaries and action-specific permissions.
- authentication
- authorization
- permissions
- multi tenant
40 minStart
04API fundamentals
Release Review Handler
Repair an authorized release endpoint that filters and paginates without leaking another tenant's data.
- authorization
- filtering
- pagination
- multi tenant
55 minStart
05API fundamentals
Dependency Health with Stale Fallback
Repair an async health endpoint so timeouts, dependency errors, and stale fallback data have different retry semantics.
- async
- dependencies
- timeout
- fallback
50 minStart
06API fundamentals
Verify and Normalize a Webhook
Repair a webhook boundary that validates signatures, rejects replays, and safely normalizes event data.
- webhooks
- signatures
- replay protection
- validation
55 minStart
07API fundamentals
Idempotent Webhook Delivery
Repair a delivery processor so retries replay completed results and temporary failures remain retryable.
- idempotency
- webhooks
- retries
- consistency
60 minStart
08API fundamentals
Article Route Contract
Repair an article route so malformed records, whitespace ids, and status headers produce a stable API contract.
- route handlers
- http
- validation
- contracts
40 minStart