{"adoption": {"forks": 111, "observed_at": "2026-08-28T04:08:27.654252+00:00", "stars": 3865}, "canonical_url": "https://ross.abutalabs.com/products/ow", "card": {"archived": false, "artifact_type": "library", "description": "Function argument validation for humans", "domain": ["developer-tools", "web-development", "programming-languages"], "enriched": true, "function": ["testing", "developer-tools"], "health_score": 63, "homepage": "https://sindresorhus.com/ow/", "language": "TypeScript", "license": "MIT", "license_family": "permissive", "maturity": "stable", "member_repos": ["sindresorhus/ow"], "name": "sindresorhus/ow", "platform": ["browser", "cross-platform"], "pushed_at": "2025-10-16T17:10:13+00:00", "repo": "sindresorhus/ow", "stars": 3865, "tags": ["validation", "type-checking", "assertion", "typescript", "runtime-validation", "type-guards", "nodejs"], "topics": ["validation", "type-checking", "nodejs", "npm-package", "javascript"], "urls": [], "use_cases": ["validate function arguments at runtime", "validate environment variables and config at startup", "assert constructor parameters in classes", "validate CLI arguments and flags", "narrow TypeScript types from unknown values", "validate object shapes with descriptive errors"], "what_it_is": "ow is a TypeScript library providing expressive, chainable runtime validation of function arguments and values with descriptive error messages. It includes built-in predicates for many types, custom validation support, and TypeScript type guards.", "when_to_avoid": ["you need complex schema validation for API responses or JSON parsing (use zod)", "you need validation outside the JavaScript/TypeScript ecosystem", "you need zero runtime overhead in production without using the dev-only shim"], "when_to_choose": ["you need runtime validation of function inputs with clear error messages", "you want self-documenting assertions with a chainable API", "you need TypeScript type guards after validation", "you want dev-only imports stripped from production bundles"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/ow", "repo": "sindresorhus/ow", "role": "main", "score": 59}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:08:27.654252+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-29T18:25:51.710098+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "eac678fe3b81906ef38ebfa3ee30d8b2385f568f424ea7addf17562e4dff4790", "fetched_at": "2026-08-28T04:08:27.654252+00:00", "kind": "readme", "missing": false, "url": "https://github.com/sindresorhus/ow"}, {"content_hash": "05372f11e38878d0c08c218b0bca9ea909dd99e0b8e1fc36be04626b682851b0", "fetched_at": "2026-08-29T09:20:30.156568+00:00", "kind": "homepage", "missing": false, "url": "https://sindresorhus.com/ow/"}, {"content_hash": "9ab9c61ac5daf454f9cc127072d7a86d94fb44f1a4e776352bacf41ebc51643c", "fetched_at": "2026-08-29T09:20:30.167701+00:00", "kind": "registry_npm", "missing": false, "url": "https://registry.npmjs.org/ow"}, {"content_hash": "be018cb06bf3fc5cd9c0ce860a1569e905944964d6c27b4cb43f9cdd2fbc29eb", "fetched_at": "2026-08-29T09:20:30.165783+00:00", "kind": "site_page", "missing": false, "url": "https://sindresorhus.com/ow/types/Predicates.html"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 47, "longevity": 100, "rhythm": 52}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 3260, "days_push": 321, "days_rel": 321, "gap_med": 18.0, "n_releases_24m": 3}, "score": 59, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}