--- title: Scoring the Reusability of Your API Estate | daily.dev description: API Reusability is a browser-based tool from API Commons that helps organizations assess how reusable their existing API estate is. It discovers APIs from... canonical: https://daily.dev/posts/scoring-the-reusability-of-your-api-estate-o4avtxjvb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Scoring the Reusability of Your API Estate | daily.dev og:description: API Reusability is a browser-based tool from API Commons that helps organizations assess how reusable their existing API estate is. It discovers APIs from... og:url: https://daily.dev/posts/scoring-the-reusability-of-your-api-estate-o4avtxjvb og:image: https://api.daily.dev/og/posts/O4aVTXjvb.png og:image:alt: Scoring the Reusability of Your API Estate og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Scoring the Reusability of Your API Estate **[API Evangelist](https://daily.dev/sources/apievangelist)** · 3 min read · 1 upvotes · 0 comments ## Summary API Reusability is a browser-based tool from API Commons that helps organizations assess how reusable their existing API estate is. It discovers APIs from sources like APIs.io, GitHub/GitLab/Bitbucket code search, HAR file uploads, and gateways (AWS API Gateway, Kong, Tyk) via a local CLI helper. All discovered APIs are indexed into a single APIs.json 0.21 file. Scoring evaluates two axes — design quality (operationIds, schema reuse via components/$ref, security, etc.) and metadata discoverability (docs, license, MCP artifacts) — plus a duplication check for repeated paths and near-identical schemas. Results roll up into an A–F composite grade with user-configurable weights. An intent search surfaces reuse candidates before teams build from scratch, and a reuse ledger tracks actual adoption. Everything runs client-side with tokens stored in local storage. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How does the API Reusability tool score whether an API is reusable? It scores APIs on two axes plus a duplication check: a design axis covering operationIds, documented operations and parameters, response and error schemas, security, servers, tags, and schema reuse via components and $ref (weighted highest); and a metadata axis covering description, documentation, linked OpenAPI, support, terms, license, and companion artifacts like MCP. These combine into an A-F composite grade with adjustable weights, plus a separate check for duplicated paths and near-identical schemas. _daily.dev surfaces tools like this for teams tackling API governance and reuse tracking._ ### How does API Reusability discover existing APIs across an organization without a central registry? It gathers evidence from multiple sources: the APIs.io catalog with no key required, code search across GitHub, GitLab, and Bitbucket using a personal token, and HAR file uploads that synthesize an OpenAPI spec from captured traffic by reading paths, parameters, headers, and response schemas. A local helper CLI also pulls specs from systems a browser cannot reach directly, like AWS API Gateway, Kong, Tyk, and Confluence, all indexed into a single APIs.json 0.21 file. _Developers mapping scattered API estates can track discovery approaches like this on daily.dev._ ## Similar posts on daily.dev - [Making API Reusability Measurable](https://daily.dev/posts/making-api-reusability-measurable-ru3xpozcq) · API Evangelist · 0 upvotes · 0 comments - [You Can Now Hire Me to Score Your API's Agent Readiness](https://daily.dev/posts/you-can-now-hire-me-to-score-your-api-s-agent-readiness-b3vbsjely) · API Evangelist · 2 upvotes · 0 comments - [Eval-Driven Design Systems \(Part 2\)](https://daily.dev/posts/eval-driven-design-systems-part-2--bxceu42yu) · RUBYLAND · 3 upvotes · 1 comments - [I Built a Tool to Stop Wasting Time on Toxic Open Source Projects](https://daily.dev/posts/i-built-a-tool-to-stop-wasting-time-on-toxic-open-source-projects-oynvruenf) · DEV · 63 upvotes · 5 comments - [A Browser-First Registry for the API Artifacts You Depend On](https://daily.dev/posts/a-browser-first-registry-for-the-api-artifacts-you-depend-on-pxr6sq9to) · API Evangelist · 0 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#openapi](https://daily.dev/tags/openapi) [View this post on daily.dev](https://daily.dev/posts/scoring-the-reusability-of-your-api-estate-o4avtxjvb) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Scoring the Reusability of Your API Estate","url":"https://daily.dev/posts/scoring-the-reusability-of-your-api-estate-o4avtxjvb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/scoring-the-reusability-of-your-api-estate-o4avtxjvb"},"datePublished":"2026-07-10T05:09:00.025Z","dateModified":"2026-09-14T06:11:26.603Z","description":"API Reusability is a browser-based tool from API Commons that helps organizations assess how reusable their existing API estate is. 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