--- title: Protect Your MCP Tools With Auth0 FGA in TypeScript description: A step-by-step guide to building a secure MCP server in TypeScript using FastMCP, Auth0 for OAuth 2.0 authentication, and Auth0 FGA (OpenFGA) for fine-grained... canonical: https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Protect Your MCP Tools With Auth0 FGA in TypeScript | daily.dev og:description: A step-by-step guide to building a secure MCP server in TypeScript using FastMCP, Auth0 for OAuth 2.0 authentication, and Auth0 FGA (OpenFGA) for fine-grained... og:url: https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq og:image: https://api.daily.dev/og/posts/6Eg5r9Xtq.png og:image:alt: Protect Your MCP Tools With Auth0 FGA in TypeScript 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. # Protect Your MCP Tools With Auth0 FGA in TypeScript **[Auth0](https://daily.dev/sources/auth0)** · 18 min read · 0 upvotes · 0 comments ## Summary A step-by-step guide to building a secure MCP server in TypeScript using FastMCP, Auth0 for OAuth 2.0 authentication, and Auth0 FGA (OpenFGA) for fine-grained authorization. The tutorial covers setting up three MCP tools (whoami, datetime, get_documents), defining a relationship-based authorization model with roles and groups, filtering tool visibility per user, and controlling access to private documents based on FGA permissions. Includes configuration of Auth0 API, FGA store, CLI-based model deployment, and testing with MCP Inspector. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Securing Your MCP Server with Firebase Auth: A Production Walkthrough](https://daily.dev/posts/securing-your-mcp-server-with-firebase-auth-a-production-walkthrough-kcbboeofo) · ITNEXT · 0 upvotes · 0 comments - [Auth0 Auth for MCP Is Now Generally Available](https://daily.dev/posts/auth0-auth-for-mcp-is-now-generally-available-wwhedbq4a) · Auth0 · 0 upvotes · 0 comments --- Tags: [#typescript](https://daily.dev/tags/typescript), [#authorization](https://daily.dev/tags/authorization), [#mcp](https://daily.dev/tags/mcp), [#auth0](https://daily.dev/tags/auth0) [View this post on daily.dev](https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq) ```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":"Protect Your MCP Tools With Auth0 FGA in TypeScript","url":"https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq"},"datePublished":"2026-02-27T15:02:10.273Z","dateModified":"2026-02-27T15:02:35.981Z","description":"A step-by-step guide to building a secure MCP server in TypeScript using FastMCP, Auth0 for OAuth 2.0 authentication, and Auth0 FGA (OpenFGA) for fine-grained...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/3a14e400218933dcbd57440f388df40a?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/3a14e400218933dcbd57440f388df40a?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Auth0","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":"Auth0","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/6510ffa7350449618fbacdddae663b82","url":"https://daily.dev/sources/auth0"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/protect-your-mcp-tools-with-auth0-fga-in-typescript-6eg5r9xtq","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"typescript,authorization,mcp,auth0","timeRequired":"PT18M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Auth0","item":"https://daily.dev/sources/auth0"},{"@type":"ListItem","position":3,"name":"Protect Your MCP Tools With Auth0 FGA in TypeScript"}]} ```