Building Ferrow. Maintainer of the ferrow-toolkit: zero-dependency TypeScript libraries, one problem per library.
- Product: https://ferrow.ai
- Toolkit: https://github.com/FerrowAI/ferrow-toolkit
FerrowAI
Building Ferrow. Maintainer of the ferrow-toolkit: zero-dependency TypeScript libraries with honest docs.
Popular repositories Loading
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prompt-cache-toolkit
prompt-cache-toolkit PublicMaximize Claude API token efficiency with prompt caching
TypeScript
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structured-output-parser
structured-output-parser PublicExtract and repair JSON from LLM text output, with a fallback option
TypeScript
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env-type-safe
env-type-safe PublicType-safe environment variable loader with schema validation, type coercion, and detailed error reporting
TypeScript
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cli-boilerplate
cli-boilerplate PublicTiny CLI micro-framework: flag parsing, subcommand routing, auto-generated help, ANSI colors, and typo suggestions. Zero runtime dependencies.
TypeScript
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api-response-validator
api-response-validator PublicStructural schema validation for API responses: nested objects, arrays, unions, enums, optional/nullable fields, and exact JSONPath mismatches. Zero runtime dependencies.
TypeScript
Repositories
Showing 10 of 102 repositories
- json-patch-ts Public
RFC 6902 JSON Patch and RFC 6901 JSON Pointer: apply, generate, and validate patches with zero dependencies
- input-validator Public
Rule-string validation engine (\"required|number|min:18\"), nested object schemas, array item validation, custom rules, and full error collection with field paths. Zero runtime dependencies.
- human-date-diff Public
Relative time formatting: diff(a, b) -> '3 days ago', configurable thresholds, duration breakdown, Intl.RelativeTimeFormat
- http-status-catalog Public
Complete HTTP status code reference with IANA registry data, lookup utilities, and category helpers
- health-check Public
Health check registry with timeout per check, critical flag, and express handler
- group-aggregate Public
In-memory analytics: groupBy with multi-key aggregations, having filters, and pivot helper
- graphql-middleware Public
GraphQL operation guard for a supplied AST: fragment-aware depth limit with cycle guard, per-field complexity scoring, operation allowlist/denylist, and introspection blocking. graphql-js is optional — accepts its document shape structurally, zero hard dependencies.
- glob-path-matcher Public
Zero-dependency glob matching: **, braces, classes, negation, dotfile policy, compile() and .gitignore-style matchList()
- fuzzy-match-scorer Public
Zero-dependency fuzzy string matching: Levenshtein, Damerau-Levenshtein, Jaro-Winkler, token-set ratio, bestMatch/rankMatches
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