--- title: "typo3_service_lookup" description: "Find a container service" canonical: typo3_service_lookup.html --- - [Takes](#takes) - [Answers with](#answers-with) - [Answered](#answered) - [services: by class](#services-by-class) - [From the 14.3 core checkout](#from-the-14-3-core-checkout) - [From the fixture installation](#from-the-fixture-installation) - [services: by tag](#services-by-tag) - [From the 14.3 core checkout](#from-the-14-3-core-checkout-1) - [From the fixture installation](#from-the-fixture-installation-1) # `typo3_service_lookup` *Find a container service* Find what the dependency injection container of the TYPO3 installation you work in assembles. That is which class stands behind a service id or an interface, whether it is public, shared and autowired, and the tags it carries. It is what each of its constructor arguments gets: the service id that lands there, per position and after autowiring. Search by a part of the id or the class, or ask for one exact tag to enumerate what registers into an extension point. That is event.listener, fluid.viewhelper, typo3.singleton, and the tags a package declares itself. It answers what this installation resolved rather than what a Services.yaml says. So a decoration, an override or an alias shows up as the class the container injects. It instantiates nothing to answer. Answers from: installation. `readOnlyHint: true` · `destructiveHint: false` · `idempotentHint: true` · `openWorldHint: false` Answers from [installation](../answer-sources.md#answer-sources-installation). ## Takes ```yaml # A case-insensitive part of the service id or the class, for example # "PageRenderer" or "Imaging". Omit to ask by tag alone. query: string # optional # One exact service tag, for example "event.listener". Omit to search by query # alone. tag: string # optional # Maximum services to return. limit: integer # optional ``` ## Answers with ```yaml # The part asked for, null where the call passed none. query: string or null # The tag asked for, null where none was. tag: string or null # Services that match before the limit. Zero is an answer: nothing this # installation assembles carries that id, class or tag. matchCount: integer # optional # One of: installation. installation: its assembled runtime state answered. answeredBy: string # optional # Every service definition the container holds, which is what the match ran # against. definitionCount: integer # optional # The aliases beside them, which the match reads too. aliasCount: integer # optional # Why the container did not assemble, empty where it did. A container that will # not compile is the finding rather than the absence of one, and the message # names the service and the argument. compilationFailure: string # optional services: # optional - # The service id, which is the class name for nearly all of them. id: string # The class the container instantiates, which a decoration or an override # makes different from the id. Empty on an alias whose target is not a # definition. class: string # The service this id is an alias of, followed to the end of the chain. # Empty where the id is a definition of its own. An interface usually # reaches its implementation this way, so this is the answer to what stands # behind it. aliasFor: string # True where the container hands it out by id. A private service is only # ever injected. public: boolean # True where every caller gets the same instance. shared: boolean autowired: boolean abstract: boolean # True where the boot sets the instance into the container rather than the # container builds it. synthetic: boolean # The tags it carries, which is what an extension point enumerates by. tags: [string] # What the constructor gets, after autowiring. Empty where it takes nothing. arguments: - # The constructor position, counted from zero. position: integer # The service id it gets, or "value" where it gets a configured value # instead of a service. resolves: string unsupported: # optional # One of: no-installation, misconfigured, installation-not-answering. # no-installation: nothing to ask from here, and searched says where the # discovery looked. misconfigured: the caller named an installation the server # could not use, so the discovery searched nothing. # installation-not-answering: the discovery found one and its console did not # answer. A stopped container or a database with no schema is that state, and # it ends without a reinstall. cause: string # What stopped it, in the words the attempt produced. reason: string # One of: installed, not-installed, undeclared. The state of the repository # the caller stands in, which the cause does not say. installed: packages sit # below the root the discovery found, so the caller lacks no install. # not-installed: the repository declares TYPO3 and has no packages below it # yet, so this call answers once composer install has run. undeclared: nothing # in the directories the discovery walked declares TYPO3, so an install here # answers nothing. Null where the discovery looked at nothing: a named root # the server could not use, or an entrypoint that handed no directory in. repositoryState: string or null # optional # What the reason means where the message alone does not say it. A console # that starts and then fails on a missing table has a database without a # schema, not a broken installation. Empty where the server knows nothing # beyond the reason. diagnosis: string # optional # Every directory the discovery walked, in order. "Nothing found" and "the # server started somewhere else" read the same, and only this list tells them # apart. Empty where the discovery never ran. searched: [string] # The setting the server could not use. Null where the caller set nothing. misconfiguration: string or null # optional settings: # Environment variable that names the installation root. root: string # Environment variable that names the console command. console: string ``` The answer carries exactly one of these sets of fields: - `query`, `tag`, `matchCount`, `answeredBy`, `definitionCount`, `aliasCount`, `compilationFailure`, `services` - `query`, `tag`, `unsupported` ## Answered Recorded on 2026-09-23 by `bin/cli tools:record`. Of two working directories, because what this server answers depends on the one a client stands in. Neither fills the whole surface. Answered against core-checkout, TYPO3 14.3.8-dev, the 14.3 core checkout below .checkouts/. Its console is out of reach: \ has no TYPO3 console — none of bin/typo3, vendor/bin/typo3 exists. Its dependencies are not installed — vendor/autoload.php is not there either, and composer install writes both. Answered against composer-project, TYPO3 14.3.0, the installation this repository writes below .fixtures/. Its console answers. The tools that declare `answeredBy` carry an answer from each, under a heading that names which. Every other answer comes from the first alone, because nothing in it would differ. Nothing checks what is below this heading; everything above it is derived from the class that answers the call, and `bin/cli tools:check` holds it. ### services: by class Called with: ```json { "query": "PageRenderer" } ``` #### From the 14.3 core checkout Text: ```text This is not answerable here, which is not the same as an empty answer: has no TYPO3 console — none of bin/typo3, vendor/bin/typo3 exists. Its dependencies are not installed — vendor/autoload.php is not there either, and composer install writes both. ``` Data: ```json { "query": "PageRenderer", "tag": null, "unsupported": { "cause": "installation-not-answering", "reason": " has no TYPO3 console — none of bin/typo3, vendor/bin/typo3 exists. Its dependencies are not installed — vendor/autoload.php is not there either, and composer install writes both", "repositoryState": "installed", "diagnosis": "", "searched": [ "" ], "misconfiguration": null, "settings": { "root": "TYPO3_DEV_COMPANION_ROOT", "console": "TYPO3_DEV_COMPANION_CONSOLE" } } } ``` #### From the fixture installation Text: ```text This is not answerable here, which is not the same as an empty answer: the installation booted and its container could not be assembled a second time: Error: Class "TYPO3\CMS\Core\Package\PackageManager" not found. ``` Data: ```json { "query": "PageRenderer", "tag": null, "unsupported": { "cause": "installation-not-answering", "reason": "the installation booted and its container could not be assembled a second time: Error: Class \"TYPO3\\CMS\\Core\\Package\\PackageManager\" not found", "repositoryState": "installed", "diagnosis": "", "searched": [ "" ], "misconfiguration": null, "settings": { "root": "TYPO3_DEV_COMPANION_ROOT", "console": "TYPO3_DEV_COMPANION_CONSOLE" } } } ``` ### services: by tag Called with: ```json { "tag": "event.listener", "limit": 3 } ``` #### From the 14.3 core checkout Text: ```text This is not answerable here, which is not the same as an empty answer: has no TYPO3 console — none of bin/typo3, vendor/bin/typo3 exists. Its dependencies are not installed — vendor/autoload.php is not there either, and composer install writes both. ``` Data: ```json { "query": null, "tag": "event.listener", "unsupported": { "cause": "installation-not-answering", "reason": " has no TYPO3 console — none of bin/typo3, vendor/bin/typo3 exists. Its dependencies are not installed — vendor/autoload.php is not there either, and composer install writes both", "repositoryState": "installed", "diagnosis": "", "searched": [ "" ], "misconfiguration": null, "settings": { "root": "TYPO3_DEV_COMPANION_ROOT", "console": "TYPO3_DEV_COMPANION_CONSOLE" } } } ``` #### From the fixture installation Text: ```text This is not answerable here, which is not the same as an empty answer: the installation booted and its container could not be assembled a second time: Error: Class "TYPO3\CMS\Core\Package\PackageManager" not found. ``` Data: ```json { "query": null, "tag": "event.listener", "unsupported": { "cause": "installation-not-answering", "reason": "the installation booted and its container could not be assembled a second time: Error: Class \"TYPO3\\CMS\\Core\\Package\\PackageManager\" not found", "repositoryState": "installed", "diagnosis": "", "searched": [ "" ], "misconfiguration": null, "settings": { "root": "TYPO3_DEV_COMPANION_ROOT", "console": "TYPO3_DEV_COMPANION_CONSOLE" } } } ```