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Practice API v2

API Challenge Explorer

Master API testing with 100 challenges across 7 protocols. Filter, explore, and get code templates instantly.

100 Challenges
7 Protocols

Learning Tracks

REST API Fundamentals

Master core HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS.

0/7 completed0%

Authentication Master

Learn Basic, Bearer, API Key, OAuth, register, logout, refresh, and RBAC patterns.

0/8 completed0%

Error Handling Pro

Handle HTTP errors: 400, 401, 403, 404, 409, 429, and 500 status codes.

0/7 completed0%

GraphQL Journey

Explore queries, variables, nested data, fragments, aliases, mutations, and introspection.

0/10 completed0%

Real-time APIs

WebSocket connections, messaging, binary data, heartbeat, chat rooms, and presence.

0/9 completed0%

Database SQL Path

SQL fundamentals: SELECT, WHERE, ORDER BY, JOINs, aggregations, and HAVING.

0/10 completed0%

Advanced Patterns

ETag caching, rate limiting, retry with backoff, circuit breaker, streaming, and tracing.

0/8 completed0%