--- title: ExpressoTS 4.0 is officially released | daily.dev description: ExpressoTS 4.0 has been released, introducing ExpressoTS Studio — a local developer experience platform providing a status dashboard, architecture map, request... canonical: https://daily.dev/posts/expressots-4-0-is-officially-released-wttcvgkzp twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: ExpressoTS 4.0 is officially released | daily.dev og:description: ExpressoTS 4.0 has been released, introducing ExpressoTS Studio — a local developer experience platform providing a status dashboard, architecture map, request... og:url: https://daily.dev/posts/expressots-4-0-is-officially-released-wttcvgkzp og:image: https://api.daily.dev/og/posts/wtTCvGKzp.png og:image:alt: ExpressoTS 4.0 is officially released 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. # ExpressoTS 4.0 is officially released **[ExpressoTS](https://daily.dev/sources/expressots)** · [@rsaz](https://daily.dev/rsaz) · 2 min read · 196 upvotes · 11 comments ## Summary ExpressoTS 4.0 has been released, introducing ExpressoTS Studio — a local developer experience platform providing a status dashboard, architecture map, request timeline with OpenTelemetry tracing, live logs, error inspector, security view (npm audit + OSV.dev), and an API client. The framework is built on Express 5 with TypeScript-first design and an Inversify-compatible DI container. Version 4.0 also brings strict TypeScript configs, leaner install footprint, subpath exports, optional validator peers (zod/yup/class-validator), and a CI compatibility gate. Studio activates automatically in development with zero production overhead. ## Content ExpressoTS is a TypeScript-first Node.js framework built on Express 5, with a lightweight, Inversify-compatible DI container and a CLI that scaffolds structured projects in seconds. ## ExpressoTS Studio Studio is a local developer experience platform for your running app. It runs entirely on your machine, nothing is sent off the box. What you get: - **Status dashboard**: app health, runtime info, DI scope counts, top routes, and an aggregate security grade - **Architecture map**: a read-only graph of controllers, use-cases, providers, and middleware, auto-generated from `AppContainer.introspect()` - **Request timeline + trace detail**: live recording of every request with OpenTelemetry spans, per-route P50/P95/P99, header/body diffing, and one-click **Replay** - **Live logs**: an in-memory buffer filterable by level, route, and context - **Error inspector**: aggregated runtime errors with stack frames that deep-link to source - **Security view**: `npm audit` + OSV.dev advisories with transitive root-cause chains, reachability scoring (confirmed / likely / unreachable / unknown), OWASP API Top 10 runtime posture, and one-click fixes - **API client**: fire requests at your app without leaving the dashboard Studio auto-activates when `@expressots/studio-agent` is installed and `NODE_ENV=development`. Production pays zero runtime cost. ## The rest of 4.0 A full production-hardening pass: Express 5 native throughout, strict TypeScript (`strictNullChecks` + `noImplicitAny`), a leaner install footprint (a single shared declaration tree), subpath exports (`@expressots/core/testing`, `/di`, `/render`, `/path-resolver`), optional validator peers (zod / yup / class-validator), and TypeScript 7-clean configs with a CI compatibility gate. ## Try it ``` npx @expressots/cli new my-app cd my-app npm run dev ``` ## Community discussion Top comments from developers on daily.dev. **@hypnoticdata777** · 8 upvotes > Bet! Thanks. **@ajaychoudhary80** · 6 upvotes > Developer tooling is becoming just as important as the framework itself. **@devmount** · 5 upvotes > TIL, didn't know about [ExpressoTS](https://github.com/expressots/expressots), will definitely give it a spin. Thanks for the share! **@devhasibulislam** · 2 upvotes > Definitely give it a spin; TYSM for sharing; **@nttan31081994** · 2 upvotes > sound good ## Similar posts on daily.dev - [AdonisJS v7 Ships End-to-End Type Safety, Reworked Starter Kits and Zero-Config OpenTelemetry](https://daily.dev/posts/adonisjs-v7-ships-end-to-end-type-safety-reworked-starter-kits-and-zero-config-opentelemetry-lrslugcvw) · InfoQ · 13 upvotes · 0 comments --- Tags: [#nodejs](https://daily.dev/tags/nodejs), [#typescript](https://daily.dev/tags/typescript), [#express](https://daily.dev/tags/express), [#dependency-injection](https://daily.dev/tags/dependency-injection) [View this post on daily.dev](https://daily.dev/posts/expressots-4-0-is-officially-released-wttcvgkzp) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/expressots-4-0-is-officially-released-wttcvgkzp","headline":"ExpressoTS 4.0 is officially released","text":"ExpressoTS 4.0 has been released, introducing ExpressoTS Studio — a local developer experience platform providing a status dashboard, architecture map, request timeline with OpenTelemetry tracing, live logs, error inspector, security view (npm audit + OSV.dev), and an API client. 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Thanks.","datePublished":"2026-07-17T14:12:30.147Z","url":"https://daily.dev/posts/wtTCvGKzp#c-THN2DmWop","author":{"@type":"Person","name":"Carlos Sanchez","url":"https://daily.dev/hypnoticdata777","image":"https://lh3.googleusercontent.com/a/ACg8ocK9rxv96SsH67LK4ct8PutsZDJEGk4MdGsB1qcZ4X56YsgOb8qxmQ=s96-c"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":8}},{"@type":"Comment","text":"Developer tooling is becoming just as important as the framework itself.","datePublished":"2026-07-18T04:23:51.420Z","url":"https://daily.dev/posts/wtTCvGKzp#c-W8GWOHcFH","author":{"@type":"Person","name":"Ajay Choudhary","url":"https://daily.dev/ajaychoudhary80","image":"https://media.daily.dev/image/upload/s--WkX8wDW2--/f_auto/v1780989706/avatars/avatar_QNZlI2SgVnNSx5PSRpCVx?_a=BAMAMiWQ0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":6}},{"@type":"Comment","text":"TIL, didn’t know about ExpressoTS, will definitely give it a spin. Thanks for the share!","datePublished":"2026-07-17T18:47:37.732Z","dateModified":"2026-07-17T18:48:22.526Z","url":"https://daily.dev/posts/wtTCvGKzp#c-5ickymIIC","author":{"@type":"Person","name":"Andreas","url":"https://daily.dev/devmount","image":"https://media.daily.dev/image/upload/s--0yHQgkD3--/f_auto/v1730121566/avatars/avatar_wkPuMtV83z5WseTrVc5QU"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":5}},{"@type":"Comment","text":"Definitely give it a spin; TYSM for sharing;","datePublished":"2026-07-20T07:07:39.778Z","url":"https://daily.dev/posts/wtTCvGKzp#c-57BAS0EqI","author":{"@type":"Person","name":"Hasibul Islam","url":"https://daily.dev/devhasibulislam","image":"https://media.daily.dev/image/upload/s--8y40yD3d--/f_auto/v1759889530/avatars/avatar_5wsOgfIfQiovnOo4FusOT?_a=BAMAK+ZW0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}},{"@type":"Comment","text":"sound good","datePublished":"2026-07-20T04:06:25.040Z","url":"https://daily.dev/posts/wtTCvGKzp#c-aytjxiqbS","author":{"@type":"Person","name":"Mr.hehe","url":"https://daily.dev/nttan31081994","image":"https://media.daily.dev/image/upload/s--Ey4wL2-q--/f_auto/v1768035856/avatars/avatar_UAQMtIZlJIlID0Gb6Rjbi?_a=BAMAMiZW0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}}],"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/expressots","name":"ExpressoTS"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ExpressoTS","item":"https://daily.dev/squads/expressots"},{"@type":"ListItem","position":3,"name":"ExpressoTS 4.0 is officially released"}]} ```