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API Implementation Labs

Hands-on ASP.NET Core contracts, writes, authorization, files, and production endpoint exercises.

15 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Typed Create Endpoint

Creates a resource through an explicit request DTO and returns typed 201, 409, and validation outcomes.

Easy~15 minStep 1 of 15

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1Typed Create EndpointRecommended startCreates a resource through an explicit request DTO and returns typed 201, 409, and validation outcomes.Coding problemEasy~15 min.NETASP.NET CoreC#Practice 2

Practice order

15 drillsOne at a time

1Typed Create EndpointUp next / Easy / ~15 min
2Validation ContractEasy / ~15 min
3Safe List QueryMedium / ~25 min
4

Validation ContractProduces field-keyed validation errors through one reusable endpoint boundary.Coding problemEasy~15 min.NETASP.NET CoreC#

Practice

3Safe List QueryImplements bounded filtering and deterministic keyset pagination without accepting arbitrary query expressions.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

4Overposting BoundaryUpdates only public mutable fields and leaves ownership, status, and audit values server-controlled.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

5Idempotent POSTStores an idempotency key, request hash, and response in the same transaction as the created resource.Coding problemHard~35 min.NETASP.NET CoreC#Practice

6If-Match ConcurrencyMaps an HTTP ETag precondition to EF Core rowversion and returns 412 when the representation is stale.Coding problemHard~35 min.NETASP.NET CoreC#Practice

7Atomic Bulk UpdateValidates a bounded command set completely before applying all updates in one SaveChanges transaction.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

8Capability PolicyMaps a named capability to an ASP.NET Core policy and enforces it at the endpoint boundary.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

9Resource OwnershipLoads a resource once, evaluates owner-or-capability authorization, and avoids trusting route ownership claims.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

10Secure UploadValidates size and signature, writes under a generated storage key, and keeps untrusted files outside the public web root.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

11Authorized DownloadAuthorizes metadata before opening storage and streams the file with safe headers and range support.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

12Downstream BoundarySeparates caller cancellation from a dependency timeout and maps expected downstream outcomes safely.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

13Durable 202 JobPersists a job and outbox command before returning a status URL for long-running work.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

14Webhook IngestionVerifies the exact request bytes, rejects stale signatures, deduplicates event ids, and queues processing durably.Coding problemHard~35 min.NETASP.NET CoreC#Practice

15Partitioned Rate LimitPartitions limits by authenticated user or trusted client address and returns useful 429 retry metadata.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

Overposting Boundary

Easy / ~15 min

5Idempotent POSTHard / ~35 min

6If-Match ConcurrencyHard / ~35 min

7Atomic Bulk UpdateMedium / ~25 min

8Capability PolicyEasy / ~15 min

+7 more drills in this section

API Implementation Labs - .NET Backend | Aporeon