--- title: Authentication and authorization in a microservice... description: Oso Cloud's local authorization feature enables efficient authorization decisions in microservices by combining facts stored in Oso with a service's local... canonical: https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization | daily.dev og:description: Oso Cloud's local authorization feature enables efficient authorization decisions in microservices by combining facts stored in Oso with a service's local... og:url: https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia og:image: https://api.daily.dev/og/posts/WsILJalia.png og:image:alt: Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization 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. # Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization **[Microservices.io](https://daily.dev/sources/microservicesio)** · 10 min read · 1 upvotes · 0 comments ## Summary Oso Cloud's local authorization feature enables efficient authorization decisions in microservices by combining facts stored in Oso with a service's local database. The `listLocal()` method generates SQL WHERE clauses for bulk queries, while `authorizeLocal()` produces SQL SELECT statements for single-entity operations. This approach eliminates the need to replicate all authorization data to Oso and avoids inefficient one-by-one authorization checks. Configuration files map Polar predicates to SQL queries, allowing services to leverage local facts alongside centralized authorization policies for better performance and reduced coupling. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Authentication and authorization in a microservice architecture - Part 5 - implementing complex authorization using Oso Cloud](https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture---part-5---implementing-complex-auth-rz42fth96) · Microservices.io · 16 upvotes · 0 comments - [Getting started with Oso Cloud](https://daily.dev/posts/getting-started-with-oso-cloud-8fwhbqjti) · Microservices.io · 1 upvotes · 0 comments - [Authentication and authorization in a microservice architecture - Part 4 - fetching and replicating authorization data](https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture---part-4---fetching-and-replicating--rnk0y3dty) · Microservices.io · 36 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#sql](https://daily.dev/tags/sql), [#microservices](https://daily.dev/tags/microservices), [#authorization](https://daily.dev/tags/authorization) [View this post on daily.dev](https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia) ```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":"TechArticle","headline":"Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization","url":"https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia"},"datePublished":"2026-02-14T07:26:45.564Z","dateModified":"2026-02-14T11:20:58.657Z","description":"Oso Cloud's local authorization feature enables efficient authorization decisions in microservices by combining facts stored in Oso with a service's local...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/99b5333c59688a149f6e69b2270322be?_a=AQAEunF","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/99b5333c59688a149f6e69b2270322be?_a=AQAEunF","isAccessibleForFree":true,"articleSection":"Microservices.io","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Microservices.io","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/7a511879d50f43698644bcf07f4d0a59","url":"https://daily.dev/sources/microservicesio"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/authentication-and-authorization-in-a-microservice-architecture-part-6---implementing-complex-autho-wsiljalia","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,sql,microservices,authorization","timeRequired":"PT10M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Microservices.io","item":"https://daily.dev/sources/microservicesio"},{"@type":"ListItem","position":3,"name":"Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization"}]} ```