Ach so. Wenn ich das im falschen Verzeichnis mache, dann kommen folgende Fehlermeldungen: ~~~ npm ERR! Require stack: npm ERR! - /usr/share/nodejs/npm/lib/utils/open-url.js npm ERR! - /usr/share/nodejs/npm/lib/commands/help.js npm ERR! - /usr/share/nodejs/npm/lib/npm.js npm ERR! - /usr/share/nodejs/npm/lib/cli.js npm ERR! - /usr/share/nodejs/npm/bin/npm-cli.js ~~~ Da der Webserver ja startet, der Fehler offenbar erst beim gewollten Start des Browsers auftritt **vermute** ich, dass Dir Dein Pendant zu `/usr/share/nodejs/npm/lib/utils/open-url.js` fehlt. Ich kann den Browser aber auch direkt starten: Registriere in der package.json zusätzlich ~~~ "serverbrowser": "concurrently \"http-server -a localhost -p 1234\" \"chromium-browser http://localhost:1234/index.html\"" ~~~ (Ersetze „chromium-browser“ durch den Befehl mit dem Du einen Browser im Terminal starten kannst.) als Skript und starte ~~~ npm run serverbrowser ~~~ Zur womöglich fehlenden Libary: Hier meine Installations-Liste: ~~~ apt list *node* | grep -i installiert | sed -e 's/\/.*$//' WARNING: apt does not have a stable CLI interface. Use with caution in scripts. libnode-dev libnode72 node-abbrev node-agent-base node-ansi-regex node-ansi-styles node-ansistyles node-aproba node-archy node-are-we-there-yet node-asap node-balanced-match node-brace-expansion node-builtins node-cacache node-chalk node-chownr node-cli-table node-clone node-color-convert node-color-name node-colors node-columnify node-console-control-strings node-copy-concurrently node-core-util-is node-debug node-decompress-response node-defaults node-delegates node-depd node-encoding node-end-of-stream node-err-code node-escape-string-regexp node-events node-fancy-log node-fs-write-stream-atomic node-fs.realpath node-function-bind node-gauge node-get-stream node-glob node-got node-graceful-fs node-gyp node-has-flag node-has-unicode node-hosted-git-info node-https-proxy-agent node-iconv-lite node-iferr node-imurmurhash node-indent-string node-inflight node-inherits node-ini node-ip-regex node-ip node-is-typedarray node-isarray node-isexe node-json-buffer node-json-parse-better-errors node-jsonparse node-lowercase-keys node-lru-cache node-mimic-response node-minimatch node-minipass node-mkdirp node-move-concurrently node-ms node-mute-stream node-negotiator node-nopt node-normalize-package-data node-npm-bundled node-npm-package-arg node-npmlog node-object-assign node-once node-osenv node-p-cancelable node-p-map node-path-is-absolute node-performance-now node-process-nextick-args node-promise-inflight node-promise-retry node-promzard node-pump node-quick-lru node-read-package-json node-read node-readable-stream node-resolve node-retry node-rimraf node-run-queue node-safe-buffer node-semver node-set-blocking node-signal-exit node-slash node-slice-ansi node-spdx-correct node-spdx-exceptions node-spdx-expression-parse node-spdx-license-ids node-ssri node-string-decoder node-string-width node-strip-ansi node-supports-color node-tar node-text-table node-time-stamp node-typedarray-to-buffer node-unique-filename node-util-deprecate node-validate-npm-package-license node-validate-npm-package-name node-wcwidth.js node-whatwg-fetch node-which node-wide-align node-wrappy node-write-file-atomic node-yallist nodejs ~~~ Wie das unter Windows geht weiß ich nicht.