BackendKit LabsComposable resilience for Node.js backends

Explicit errors. Adaptive retries. Observable failures. 7 packages that compose into a coherent system — not just isolated utilities. Built from production experience with distributed systems. Community in early formation, your use cases shape the roadmap.

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Auto-Learning

The only Node.js resilience toolkit that tunes itself. Monitors real traffic patterns and automatically adjusts circuit breaker thresholds, bulkhead concurrency limits, and HTTP client timeouts — no manual tweaking required.

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Result Monad

Type-safe error handling. Replace try/catch with composable transformations, resilience primitives (retry, backoff, jitter, timeout), and NestJS integration. Zero runtime dependencies.

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Circuit Breaker

Sliding-window circuit breaker with business vs infrastructure error classification. Stops cascading failures before they take your service down.

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Bulkhead

Concurrency limiting inspired by Resilience4j. Isolates failures and prevents resource exhaustion — framework-agnostic core with NestJS guard, interceptor, and middleware.

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HTTP Client

Production-grade HTTP client on axios. Every call returns Result — no try/catch. Built-in circuit breaker, retry with jitter, request cancellation, and pre-request pipeline middleware.

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Pipeline

Chain of Responsibility pattern for async middleware. Steps transform context and return typed results — stop-on-first or collect-all error modes, conditional steps, observability hooks.

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Observability

Structured logging, metrics shipping, correlation ID propagation via AsyncLocalStorage, and optional OpenTelemetry spans — all for NestJS.

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Request Scanner

WAF for Node.js with 23 built-in rules across 6 attack categories — SQLi, XSS, Path Traversal, Command Injection, NoSQL Injection, SSRF. Framework-agnostic core + NestJS middleware and pipe.

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Console Animations

17 built-in terminal animations for Node.js CLIs — spinners, progress bars, visual effects. CI-aware, zero runtime dependencies.

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