Async retry with exponential backoff and circuit breaker for Rust
HMAC-SHA256 webhook signing and verification for Rust
Generic LRU cache with TTL, tags, and async support for Rust
In-process thread-based task queue with priority and concurrency control
Typed environment variable validation with batch error reporting for Rust
In-memory feature flag evaluation with rollout, environment, targeting, and A/B variant support for Rust
Thread-safe event bus with typed listeners for Rust
Extension traits for Result and Option with tap, map, and error accumulation
Unified ID generation: ULID, UUIDv7, NanoID, and Snowflake
Semantic versioning with range parsing, comparison, and bumping
Human-readable duration formatting and parsing
Lightweight string template engine with variables, conditionals, and loops
Layered configuration from files and environment variables
Cron expression parsing, scheduling, and human-readable descriptions
Data masking and redaction for strings, emails, and sensitive data
Token bucket, sliding window, and fixed window rate limiting
Graceful shutdown coordination with timeout support for Rust
Structural JSON diff with path tracking for Rust
Human-readable byte size formatting and parsing
Service health checker with liveness and readiness probes for Rust
Early-return guard clause macros for cleaner control flow
Unicode-aware slug generation for URL-safe strings
High-level CSV reading, writing, and manipulation
Better test assertion diffs with colored inline comparisons
Secure in-memory secret storage with automatic zeroization, expiry, and redacted display
JSON Web Token encoding, decoding, and validation with HMAC algorithms
HTTP health check client for monitoring service dependencies with configurable thresholds
Ergonomic CLI binary integration testing with fluent assertions on stdout, stderr, and exit code
Fast .env file parser with variable interpolation, multi-file layering, and type-safe loading
File type detection from content (magic bytes), file extension, and MIME type mapping
RFC 5322 compliant email address parsing, validation, and normalization
Date and time utilities — business days, date ranges, holiday calendars, and formatting shortcuts
Lightweight, per-test HTTP mock server for testing API integrations
Easy parallel iteration — par_map, par_filter, par_for_each with progress and error collection
Strongly-typed HTTP header parsing and construction for common headers
Micro-benchmarking utilities with statistical analysis, comparison, and regression detection
Terminal table rendering with alignment, borders, Unicode support, and ANSI color awareness
IP address utilities — CIDR matching, subnet calculation, classification, and anonymization
Dead-simple password hashing with Argon2id — hash() and verify(), nothing more
Programmatic CHANGELOG.md parsing, generation, and manipulation following Keep a Changelog format
Color manipulation library — parsing, conversion, blending, contrast checking, and ANSI terminal output
String manipulation utilities — truncation, case conversion, padding, and whitespace operations
Cross-platform terminal color and style output with automatic capability detection
Declarative HTTP API integration testing framework with fluent assertions