A UI5 CLI middleware that runs a CDS server inside the UI5 dev server, mounted at a path the UI5 project configures, so one command serves the app and its CAP services.
A UI5 CLI project's dev server serves the app, and the CAP services it calls run in a second process started and stopped on its own. This middleware calls cds serve and embeds the express middlewares it returns into the UI5 dev server, so one command answers both: it is entered under server/customMiddleware in ui5.yaml, where mountPath sets the url the CDS server answers on and moduleId names the npm package the CDS server is loaded from. Its default options are with-mocks and in-memory?, which start in-process mock services for required services that have no external binding and add a transient in-memory database bootstrapped on each restart. It is the counterpart of cds-plugin-ui5cds-plugin-ui5cds-pluginA CDS plugin that runs the UI5 CLI express middlewares inside the CDS server, so a UI5 CLI project is served from the same port as the services, mounted under a path from its ui5.yaml.community org, cap, which embeds the other way round, the UI5 CLI middlewares inside the CDS server; the repository's own comparison of the six tools that connect a UI5 app to a backend lists both, and separates them on which of the two embeds the CAP server. In a project it is one development dependency of the UI5 project, on @ui5/cli@ui5/clicliThe UI5 Tooling command line for project setup, the local dev server and the build, which defines a UI5 project's shape and its two extension points, custom middleware and custom tasks.sap official, ui5 3 or higher.
Build and dev-server toolingUI5Build and dev-server toolingcapabilityServing an app locally and building it for deployment — proxying a backend, transpiling, bundling, and shaping the result for whatever will host it.
Requires
@sap/cds≥ 6.8.1@sap/cdsartifactThe CDS server it embeds: the middleware calls cds serve internally to create the middleware functions and puts them into the UI5 development server.@ui5/cli@ui5/cliartifactThe dev server it plugs into as a custom middleware, and the specVersion: "3.0" its configuration is written against.
Who is behind it
Peter MuessigPeter MuessigPersonMaintains this In the atlas: maintains 14, contributes to 80, wrote 1@petermuessigUI5 CommunityUI5 CommunityOrganisationMaintains this In the atlas: maintains 69@ui5-communitymaintainersDimitar FenerskiPersonContributes to this In the atlas: contributes to 23@dfenerskiDominik FeiningerPersonContributes to this In the atlas: contributes to 11@dominikfeiningerFlorian VogtPersonContributes to this In the atlas: contributes to 50, wrote 2@flovogtDominik HeimPersonContributes to this In the atlas: contributes to 25@heimwege4 contributors
What it declares
Every artifact
Type
Build tool
Origin
By a community org
Runtime
Node.js
declared
As a build tool
Declared for
>=6.8.1
declared, the peer range, as published
Distributed through
npm
declared, How the tool is added to a project, as its documentation says., read npm add ui5-middleware-cap -D — ui5-middleware-cap — README, 2026-10-18
Connections5
Group by
NodeRelationConditionBasis
Functional2
cds-plugin-ui5cds-plugin-ui5cds-pluginUI5 CLI middlewares running inside the CDS servercommunity org, cap
→alternative to
none
authored
alternative to cds-plugin-ui5
Functional, authored
UI5 CLI middlewares running inside the CDS server
Build and dev-server toolingBuild and dev-server toolingcapabilityServing an app locally and building it for deploymentSAP and community, narrow by design
→provides
Registers a UI5 CLI custom middleware that calls `cds serve` and embeds the CDS server's express middlewares into the dev server, at the url `mountPath` names and from the npm package `moduleId` names.
provides Build and dev-server tooling
Functional, stated
For
Registers a UI5 CLI custom middleware that calls `cds serve` and embeds the CDS server's express middlewares into the dev server, at the url `mountPath` names and from the npm package `moduleId` names.
Basis
“UI5 CLI middleware embedding the CDS server middlewares (CAP)”ui5-middleware-cap — npm, checked “The `ui5-middleware-cap` is a UI5 CLI middleware which is used to improve the development experience for the node runtime of the SAP Cloud Application Programming Model (CAP) and enables the integration of a CDS server into the UI5 development server via the CDS server express middlewares.”ui5-middleware-cap — README, checked “If specified, the CDS server will be available at the specified url.”ui5-middleware-cap — README, mountPath, checked “If specified, the CDS server will be loaded from the NPM package with the given moduleId (package name).”ui5-middleware-cap — README, moduleId, checked
stated
provides Build and dev-server tooling
Functional, stated
For
Registers a UI5 CLI custom middleware that calls `cds serve` and embeds the CDS server's express middlewares into the dev server, at the url `mountPath` names and from the npm package `moduleId` names.
Basis
“UI5 CLI middleware embedding the CDS server middlewares (CAP)”ui5-middleware-cap — npm, checked “The `ui5-middleware-cap` is a UI5 CLI middleware which is used to improve the development experience for the node runtime of the SAP Cloud Application Programming Model (CAP) and enables the integration of a CDS server into the UI5 development server via the CDS server express middlewares.”ui5-middleware-cap — README, checked “If specified, the CDS server will be available at the specified url.”ui5-middleware-cap — README, mountPath, checked “If specified, the CDS server will be loaded from the NPM package with the given moduleId (package name).”ui5-middleware-cap — README, moduleId, checked
Serving an app locally and building it for deployment
Technical3
ui5-bookshop-viewerui5-bookshop-viewersampleUI5 app consuming the cds-bookshop server via ui5-middleware-capcommunity org, ui5
←needed by
The middleware the viewer demos: it is what puts the CAP server into the UI5 server that serves the app.
needed by ui5-bookshop-viewer
Technical, derived, through inverted from its requires edge
For
The middleware the viewer demos: it is what puts the CAP server into the UI5 server that serves the app.
UI5 app consuming the cds-bookshop server via ui5-middleware-cap
@sap/cds@sap/cdspackageCAP Node.js runtimesap official, cap
→needs
The CDS server it embeds: the middleware calls `cds serve` internally to create the middleware functions and puts them into the UI5 development server.
needs @sap/cds
Technical, declared
For
The CDS server it embeds: the middleware calls `cds serve` internally to create the middleware functions and puts them into the UI5 development server.
Basis
“Allows to provide some CLI options for the `cds serve` command which is called internally to create the middleware functions and embed them into the UI5 development server:”ui5-middleware-cap — README, options, checked “"@sap/cds": ">=6.8.1"”ui5-middleware-cap — package.json, peerDependencies, checked
declared
needs @sap/cds
Technical, declared
For
The CDS server it embeds: the middleware calls `cds serve` internally to create the middleware functions and puts them into the UI5 development server.
Basis
“Allows to provide some CLI options for the `cds serve` command which is called internally to create the middleware functions and embed them into the UI5 development server:”ui5-middleware-cap — README, options, checked “"@sap/cds": ">=6.8.1"”ui5-middleware-cap — package.json, peerDependencies, checked
CAP Node.js runtime
@ui5/cli@ui5/clicliUI5 Tooling command line for project setup, dev server and buildsap official, ui5
→needs
The dev server it plugs into as a custom middleware, and the `specVersion: "3.0"` its configuration is written against.
needs @ui5/cli
Technical, declared
For
The dev server it plugs into as a custom middleware, and the `specVersion: "3.0"` its configuration is written against.
Basis
“All releases of this UI5 CLI extension using the major version `3` require UI5 CLI V3.”ui5-middleware-cap — README, Prerequisites, checked “"@ui5/cli": ">=3"”ui5-middleware-cap — package.json, peerDependencies, checked
declared
needs @ui5/cli
Technical, declared
For
The dev server it plugs into as a custom middleware, and the `specVersion: "3.0"` its configuration is written against.
Basis
“All releases of this UI5 CLI extension using the major version `3` require UI5 CLI V3.”ui5-middleware-cap — README, Prerequisites, checked “"@ui5/cli": ">=3"”ui5-middleware-cap — package.json, peerDependencies, checked
UI5 Tooling command line for project setup, dev server and build
👋 This is an open‑source, community‑driven project, developed and actively monitored by members of the UI5 community. You are welcome to use it, report issues, contribute enhancements, and support others in the community.
The ui5-middleware-cap is a UI5 CLI middleware which is used to improve the development experience for the node runtime of the SAP Cloud Application Programming Model (CAP) and enables the integration of a CDS server into the UI5 development server via the CDS server express middlewares. In addition to the middleware the CDS server project needs to be added as dependency so that the server is detected and attached properly. The pre-defined routes in the CDS server are reused.
⚠️ UI5 CLI Compatibility
All releases of this UI5 CLI extension using the major version 3 require UI5 CLI V3. Any previous releases below major version 3 (if available) also support older versions of the UI5 CLI. But the usage of the latest UI5 CLI is strongly recommended!
moduleId: <string>
If specified, the CDS server will be loaded from the NPM package with the given moduleId (package name). If not provided, the middleware will lookup the CDS server from the project dependencies or devDependencies.
mountPath: <string>
If specified, the CDS server will be available at the specified url.
options: <object> (default: { "with-mocks": true, "in-memory?": true } )
Allows to provide some CLI options for the cds serve command which is called internally to create the middleware functions and embed them into the UI5 development server:
with-mocks: <boolean>
It starts in-process mock services for all required services configured in package.json#cds.requires, which don't have external bindings in the current process environment.
in-memory[?]: <boolean>
Automatically adds a transient in-memory database bootstrapped on each (re-)start in the same way cds deploy would do, based on defaults or configuration in package.json#cds.requires.db. Add a question mark to apply a more defensive variant which respects the configured database, if any, and only adds an in-memory database if no persistent one is configured.
Support
Please use the GitHub bug tracking system to post questions, bug reports or to create pull requests.
Contributing
Any type of contribution (code contributions, pull requests, issues) to this set of UI5 CLI extensions will be equally appreciated.
Built with care (and a lot of caffeine). If this helped you build, test, or ship, the next coffee — or drink — is on you when you bump into a contributor.
#13733c544b7 Thanks @petermuessig! - Bump the express peerDependency floor from >=4.18.2 to >=4.19.2 so the declared range no longer permits versions affected by GHSA-rv95-896h-c2vc (open redirect). Closes Dependabot alerts #110, #111, #113, #114, #115, #117.
All notable changes to this project will be documented in this file.
See Conventional Commits for commit guidelines.
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A UI5 CLI project's dev server serves the app, and the CAP services it calls run in a second process started and stopped on its own. This middleware calls `cds serve` and embeds the express middlewares it returns into the UI5 dev server, so one command answers both: it is entered under `server/customMiddleware` in `ui5.yaml`, where `mountPath` sets the url the CDS server answers on and `moduleId` names the npm package the CDS server is loaded from. Its default options are `with-mocks` and `in-memory?`, which start in-process mock services for required services that have no external binding and add a transient in-memory database bootstrapped on each restart. It is the counterpart of [cds-plugin-ui5](artifact:ui5-community-cds-plugin-ui5), which embeds the other way round, the UI5 CLI middlewares inside the CDS server; the repository's own comparison of the six tools that connect a UI5 app to a backend lists both, and separates them on which of the two embeds the CAP server. In a project it is one development dependency of the UI5 project, on [@ui5/cli](artifact:sap-ui5-cli) 3 or higher.
UI5 CLI middleware that runs a CDS server inside the UI5 dev server, mounted at a path the UI5 project configures.
capability:ui5-build-tooling, with what_it_does and the README's own sentences on the middleware, mountPath and moduleId
The maintainers publish the two as members of one set and compare them in one table. The repository README: "Six tools in this repo can connect a UI5 app to a backend (`cds-plugin-ui5`, `ui5-middleware-cap`, `ui5-middleware-approuter`, `@sap/approuter`, `dev-approuter`, `ui5-middleware-simpleproxy`)." The comparison in docs/backend-connectivity.md is what separates this pair: "| Embeds CAP server | ❌ | ✅ | (✅)¹ | ❌ | ✅ | (✅)¹ |", the first two columns being cds-plugin-ui5 and ui5-middleware-cap. The inverse edge is derived, so cds-plugin-ui5 shows it without being edited.
runtimes node, cds_range >=6.8.1
artifact:sap-cds, artifact:sap-ui5-cli
Peter Muessig, actor:petermuessig and actor:ui5-community
