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description=Reference for Nitric s Dart library - Subscribe a handler to a topic and receive new events for processing.;

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dart topic subscribe nitric documentation foundations guides search search docs 1 9k search search docs introduction get started installation quick start guides foundations why nitric projects overview configuration infrastructure overview services resources security local development deployment architecture overview services apis schedules websockets websites storage key value stores async messaging queues topics sql databases secrets build apis batch ai ml hpc schedules websockets websites storage key value stores sql databases async messaging secrets deploy overview pulumi overview aws google cloud azure terraform overview aws google cloud azure service mappings aws apis batch schedules websockets websites storage key value stores sql databases topics queues secrets azure apis schedules websites storage key value stores sql databases topics queues secrets google cloud apis batch schedules websites storage key value stores sql databases topics queues secrets custom overview provider extension custom providers adding resource types install with docker languages overview node js overview apis api api get api post api put api delete api patch api route api route all api route get api route post api route put api route delete api route patch batch job job handler job submit http http key value stores kv kv get kv set kv delete kv keys topics topic topic publish topic subscribe queues queue queue enqueue queue dequeue secrets secret secret put secret version secret latest secret version access storage bucket bucket on bucket file bucket files file exists file read file write file delete file getdownloadurl file getuploadurl sql sql sql connectionstring schedules schedule schedule every schedule cron websockets websocket websocket on websocket send websocket close python overview apis api api get api post api put api delete api patch api methods api all batch job job handler job submit key value stores kv kv get kv set kv delete kv keys topics topic topic publish topic subscribe queues queue queue enqueue queue dequeue secrets secret secret put secret version secret latest secret version access storage bucket bucket on bucket file bucket files file read file write file delete file download_url file upload_url sql sql sql connection_string schedules schedule websockets websocket websocket on websocket send go overview resources newapi newjob newkv newqueue newsecret newsqldatabase newbucket newtopic newschedule newwebsocket apis api get api post api put api delete api patch api newroute api route all api route get api route post api route put api route delete api route patch batch job handler job submit key value stores kv get kv set kv delete kv keys topics topic publish topic subscribe queues queue enqueue queue dequeue secrets secret put secret accessversion secret access storage bucket on bucket listfiles bucket read bucket write bucket delete bucket downloadurl bucket uploadurl sql sqldatabase connectionstring schedules schedule every schedule cron websockets websocket on websocket send websocket close dart overview apis api api all api get api post api put api delete api patch api route api route all api route get api route post api route put api route delete api route patch batch job job handler job submit key value stores kv kv get kv set kv delete kv keys topics topic topic publish topic subscribe queues queue queue enqueue queue dequeue secrets secret secret put secret version secret latest secret version access storage bucket bucket on bucket file bucket files file exists file read file write file delete file getdownloadurl file getuploadurl sql sql sql connectionstring schedules schedule schedule every schedule cron websockets websocket websocket on websocket send websocket close reference cli preview features other config env vars custom service containers misc examples faq contributions support dart topic subscribe dart topic subscribe this is reference documentation for the nitric dart sdk to learn about topics and pub sub in nitric start with the async messaging docs subscribe a handler to a topic and receive new events for processing copy copied import package nitric_sdk nitric dart final updates nitric topic updates updates subscribe ctx async log the provided message print ctx req json return ctx parameters name handler required required type messagehandler description the middleware code to be triggered by the topic examples subscribe to a topic copy copied import package nitric_sdk nitric dart final updates nitric topic updates updates subscribe ctx async log the provided message print ctx req json return ctx notes a service may only subscribe to a topic once if multiple subscribers are required create them in different service a service may subscribe to or publish to a topic but not both edit this page on github have feedback on this page open github issue last updated on jan 5 2026 on this page parameters examples edit this page on github 2026 nitric inc contributions support foundations 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