{"adoption": {"forks": 159, "observed_at": "2026-08-28T04:06:33.447631+00:00", "stars": 2276}, "canonical_url": "https://ross.abutalabs.com/products/spfjs", "card": {"archived": true, "artifact_type": "framework", "description": "A lightweight JS framework for fast navigation and page updates from YouTube", "domain": ["web-development", "frontend", "performance"], "enriched": true, "function": ["web-framework", "caching", "templating", "http-client"], "health_score": 10, "homepage": "https://youtube.github.io/spfjs/", "language": "JavaScript", "license": "MIT", "license_family": "permissive", "maturity": "maintenance", "member_repos": ["youtube/spfjs"], "name": "youtube/spfjs", "platform": ["browser"], "pushed_at": "2024-10-09T18:58:17+00:00", "repo": "youtube/spfjs", "stars": 2276, "tags": ["progressive-enhancement", "page-fragments", "single-page-navigation", "youtube", "html5-history", "javascript", "nodejs"], "topics": [], "urls": [], "use_cases": ["speed up navigation on a multi-page site without a full SPA rewrite", "update only parts of a page that change between navigations", "keep a persistent responsive UI during page transitions", "serve document fragments as JSON from any server-side language", "cache responses in memory for instant back/forward navigation", "stream multipart responses to start rendering early"], "what_it_is": "SPF (Structured Page Fragments) is a lightweight JavaScript framework from YouTube for fast navigation and partial page updates. It uses progressive enhancement and HTML5 to update only changed page sections during navigation, with fragment responses, script/style management, and an in-memory cache.", "when_to_avoid": ["you are starting a new project - modern SPA frameworks or View Transitions API are better supported", "you need a full component-based frontend framework", "your site is already a single-page application", "you need active community development - the project is in maintenance mode"], "when_to_choose": ["you have a server-rendered site and want SPA-like navigation with minimal changes", "you want a tiny (~10K) dependency-free client library", "you need progressive enhancement where links still work without JS", "you want to reuse the same templates for static and dynamic rendering"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/spfjs", "repo": "youtube/spfjs", "role": "main", "score": 10}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:06:33.447631+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T02:41:28.219167+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aac431c7b37d13ed4c76168ddb8c287d22d8e88c7f1b2577054f9460f376b288", "fetched_at": "2026-08-28T04:06:33.447631+00:00", "kind": "readme", "missing": false, "url": "https://github.com/youtube/spfjs"}, {"content_hash": "122f0e177647becffd28d0e42affaec6b006b218c44a19c6579fc921f21538f7", "fetched_at": "2026-08-29T10:22:13.728540+00:00", "kind": "homepage", "missing": false, "url": "https://youtube.github.io/spfjs/"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 0, "longevity": 100, "rhythm": 8}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": ["archived"], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4506, "days_push": 693, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 10, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}