[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-trpc-middlewares":3,"mdc--h47a5v-key":37,"related-repo-trpc-middlewares":4393,"related-org-trpc-middlewares":4496},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":20,"repoUrl":21,"updatedAt":22,"license":23,"forks":24,"topics":25,"repo":32,"sourceUrl":35,"mdContent":36},"middlewares","compose middleware for tRPC procedures","Create and compose tRPC middleware with t.procedure.use(), extend context via opts.next({ ctx }), build reusable middleware with .concat() and .unstable_pipe(), define base procedures like publicProcedure and authedProcedure. Access raw input with getRawInput(). 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","https:\u002F\u002Fgithub.com\u002Ftrpc\u002Ftrpc\u002Ftree\u002FHEAD\u002Fpackages\u002Fserver\u002Fskills\u002Fmiddlewares","---\nname: middlewares\ndescription: >\n Create and compose tRPC middleware with t.procedure.use(), extend context via\n opts.next({ ctx }), build reusable middleware with .concat() and .unstable_pipe(),\n define base procedures like publicProcedure and authedProcedure. Access raw input\n with getRawInput(). Logging, timing, OTEL tracing patterns.\ntype: core\nlibrary: trpc\nlibrary_version: '11.16.0'\nrequires:\n - server-setup\nsources:\n - 'trpc\u002Ftrpc:www\u002Fdocs\u002Fserver\u002Fmiddlewares.md'\n - 'trpc\u002Ftrpc:www\u002Fdocs\u002Fserver\u002Fauthorization.md'\n - 'trpc\u002Ftrpc:packages\u002Fserver\u002Fsrc\u002Funstable-core-do-not-import\u002Fmiddleware.ts'\n - 'trpc\u002Ftrpc:packages\u002Fserver\u002Fsrc\u002Funstable-core-do-not-import\u002FprocedureBuilder.ts'\n---\n\n# tRPC -- Middlewares\n\n## Setup\n\n```ts\n\u002F\u002F server\u002Ftrpc.ts\nimport { initTRPC, TRPCError } from '@trpc\u002Fserver';\n\ntype Context = {\n user?: { id: string; isAdmin: boolean };\n};\n\nconst t = initTRPC.context\u003CContext>().create();\n\nexport const router = t.router;\nexport const publicProcedure = t.procedure;\nexport const middleware = t.middleware;\n```\n\n## Core Patterns\n\n### Auth middleware that narrows context type\n\n```ts\n\u002F\u002F server\u002Ftrpc.ts\nimport { initTRPC, TRPCError } from '@trpc\u002Fserver';\n\ntype Context = {\n user?: { id: string; isAdmin: boolean };\n};\n\nconst t = initTRPC.context\u003CContext>().create();\n\nexport const publicProcedure = t.procedure;\n\nexport const authedProcedure = t.procedure.use(async (opts) => {\n const { ctx } = opts;\n if (!ctx.user) {\n throw new TRPCError({ code: 'UNAUTHORIZED' });\n }\n return opts.next({\n ctx: {\n user: ctx.user,\n },\n });\n});\n\nexport const adminProcedure = t.procedure.use(async (opts) => {\n const { ctx } = opts;\n if (!ctx.user?.isAdmin) {\n throw new TRPCError({ code: 'UNAUTHORIZED' });\n }\n return opts.next({\n ctx: {\n user: ctx.user,\n },\n });\n});\n```\n\nAfter the middleware, `ctx.user` is non-nullable in downstream procedures.\n\n### Logging and timing middleware\n\n```ts\n\u002F\u002F server\u002Ftrpc.ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nexport const loggedProcedure = t.procedure.use(async (opts) => {\n const start = Date.now();\n\n const result = await opts.next();\n\n const durationMs = Date.now() - start;\n const meta = { path: opts.path, type: opts.type, durationMs };\n\n result.ok\n ? console.log('OK request timing:', meta)\n : console.error('Non-OK request timing', meta);\n\n return result;\n});\n```\n\n### Reusable middleware with .concat()\n\n```ts\n\u002F\u002F myPlugin.ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nexport function createMyPlugin() {\n const t = initTRPC.context\u003C{}>().meta\u003C{}>().create();\n\n return {\n pluginProc: t.procedure.use((opts) => {\n return opts.next({\n ctx: {\n fromPlugin: 'hello from myPlugin' as const,\n },\n });\n }),\n };\n}\n```\n\n```ts\n\u002F\u002F server\u002Ftrpc.ts\nimport { initTRPC } from '@trpc\u002Fserver';\nimport { createMyPlugin } from '.\u002FmyPlugin';\n\nconst t = initTRPC.context\u003C{}>().create();\nconst plugin = createMyPlugin();\n\nexport const publicProcedure = t.procedure;\n\nexport const procedureWithPlugin = publicProcedure.concat(plugin.pluginProc);\n```\n\n`.concat()` merges a partial procedure (from any tRPC instance) into your procedure chain, as long as context and meta types overlap.\n\n### Extending middlewares with .unstable_pipe()\n\n```ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nconst fooMiddleware = t.middleware((opts) => {\n return opts.next({\n ctx: { foo: 'foo' as const },\n });\n});\n\nconst barMiddleware = fooMiddleware.unstable_pipe((opts) => {\n console.log(opts.ctx.foo);\n return opts.next({\n ctx: { bar: 'bar' as const },\n });\n});\n\nconst barProcedure = t.procedure.use(barMiddleware);\n```\n\nPiped middlewares run in order and each receives the context from the previous middleware.\n\n## Common Mistakes\n\n### [CRITICAL] Forgetting to call and return opts.next()\n\nWrong:\n\n```ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nconst logMiddleware = t.middleware(async (opts) => {\n console.log('request started');\n \u002F\u002F forgot to call opts.next()\n});\n```\n\nCorrect:\n\n```ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nconst logMiddleware = t.middleware(async (opts) => {\n console.log('request started');\n const result = await opts.next();\n console.log('request ended');\n return result;\n});\n```\n\nMiddleware must call `opts.next()` and return its result; forgetting this silently drops the request with an INTERNAL_SERVER_ERROR because no middleware marker is returned.\n\nSource: packages\u002Fserver\u002Fsrc\u002Funstable-core-do-not-import\u002FprocedureBuilder.ts\n\n### [HIGH] Extending context with wrong type in opts.next()\n\nWrong:\n\n```ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nconst middleware = t.middleware(async (opts) => {\n return opts.next({ ctx: 'not-an-object' });\n});\n```\n\nCorrect:\n\n```ts\nimport { initTRPC } from '@trpc\u002Fserver';\n\nconst t = initTRPC.create();\n\nasync function getUser() {\n return { id: '1', name: 'Katt' };\n}\n\nconst middleware = t.middleware(async (opts) => {\n return opts.next({ ctx: { user: await getUser() } });\n});\n```\n\nContext extension in `opts.next({ ctx })` must be an object; passing non-object values or overwriting required keys breaks downstream procedures.\n\nSource: www\u002Fdocs\u002Fserver\u002Fmiddlewares.md\n\n## See Also\n\n- `server-setup` -- initTRPC, routers, procedures, context\n- `validators` -- input\u002Foutput validation with Zod\n- `error-handling` -- TRPCError codes used in auth middleware\n- `auth` -- full auth patterns combining middleware + client 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Enable response streaming with awsLambdaStreamingRequestHandler() wrapped in awslambda.streamifyResponse(). CreateAWSLambdaContextOptions provides event and context for context creation.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4401,4404,4407,4408],{"name":4402,"slug":4403,"type":15},"API Development","api-development",{"name":4405,"slug":4406,"type":15},"AWS","aws",{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-07-18T05:47:05.451869",{"slug":4411,"name":4411,"fn":4412,"description":4413,"org":4414,"tags":4415,"stars":20,"repoUrl":21,"updatedAt":4422},"adapter-express","mount tRPC as Express middleware","Mount tRPC as Express middleware with createExpressMiddleware() from @trpc\u002Fserver\u002Fadapters\u002Fexpress. Access Express req\u002Fres in createContext via CreateExpressContextOptions. Mount at a path prefix like app.use('\u002Ftrpc', ...). 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CreateFastifyContextOptions provides req, res.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4429,4430,4431,4434],{"name":4402,"slug":4403,"type":15},{"name":13,"slug":14,"type":15},{"name":4432,"slug":4433,"type":15},"Fastify","fastify",{"name":9,"slug":8,"type":15},"2026-07-18T05:46:53.746621",{"slug":4437,"name":4437,"fn":4438,"description":4439,"org":4440,"tags":4441,"stars":20,"repoUrl":21,"updatedAt":4455},"adapter-fetch","deploy tRPC on edge runtimes","Deploy tRPC on WinterCG-compliant edge runtimes with fetchRequestHandler() from @trpc\u002Fserver\u002Fadapters\u002Ffetch. Supports Cloudflare Workers, Deno Deploy, Vercel Edge Runtime, Astro, Remix, SolidStart. FetchCreateContextFnOptions provides req (Request) and resHeaders (Headers) for context creation. The endpoint option must match the URL path prefix where the handler is mounted.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4442,4445,4448,4451,4452],{"name":4443,"slug":4444,"type":15},"Cloudflare","cloudflare",{"name":4446,"slug":4447,"type":15},"Deployment","deployment",{"name":4449,"slug":4450,"type":15},"Edge","edge",{"name":9,"slug":8,"type":15},{"name":4453,"slug":4454,"type":15},"Vercel","vercel","2026-07-18T05:46:50.548228",{"slug":4457,"name":4457,"fn":4458,"description":4459,"org":4460,"tags":4461,"stars":20,"repoUrl":21,"updatedAt":4468},"adapter-standalone","mount tRPC on Node.js servers","Mount tRPC on Node.js built-in HTTP server with createHTTPServer() from @trpc\u002Fserver\u002Fadapters\u002Fstandalone, createHTTPHandler() for custom http.createServer, createHTTP2Handler() for HTTP\u002F2 with TLS. Configure basePath to slice URL prefix, CORS via the cors npm package passed as middleware option. CreateHTTPContextOptions provides req and res for context creation.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4462,4463,4464,4467],{"name":4402,"slug":4403,"type":15},{"name":13,"slug":14,"type":15},{"name":4465,"slug":4466,"type":15},"Node.js","node-js",{"name":9,"slug":8,"type":15},"2026-07-18T05:46:58.093869",{"slug":4384,"name":4384,"fn":4470,"description":4471,"org":4472,"tags":4473,"stars":20,"repoUrl":21,"updatedAt":4481},"implement authentication in tRPC applications","Implement JWT\u002Fcookie authentication and authorization in tRPC using createContext for user extraction, t.middleware with opts.next({ ctx }) for context narrowing to non-null user, protectedProcedure base pattern, client-side Authorization headers via httpBatchLink headers(), WebSocket connectionParams, and SSE auth via cookies or EventSource polyfill custom headers.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4474,4476,4479,4480],{"name":4475,"slug":4384,"type":15},"Auth",{"name":4477,"slug":4478,"type":15},"Authentication","authentication",{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-07-18T05:46:45.347628",{"slug":4483,"name":4483,"fn":4484,"description":4485,"org":4486,"tags":4487,"stars":20,"repoUrl":21,"updatedAt":4495},"caching","configure HTTP caching for tRPC queries","Set HTTP cache headers on tRPC query responses via responseMeta callback for CDN and browser caching. Configure Cache-Control, s-maxage, stale-while-revalidate. Handle caching with batching and authenticated requests. Avoid caching mutations, errors, and authenticated responses.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4488,4489,4491,4494],{"name":13,"slug":14,"type":15},{"name":4490,"slug":4483,"type":15},"Caching",{"name":4492,"slug":4493,"type":15},"Performance","performance",{"name":9,"slug":8,"type":15},"2026-07-18T05:46:45.86443",{"items":4497,"total":1081},[4498,4505,4512,4519,4527,4534,4541,4548,4560,4573,4583,4589],{"slug":4396,"name":4396,"fn":4397,"description":4398,"org":4499,"tags":4500,"stars":20,"repoUrl":21,"updatedAt":4409},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4501,4502,4503,4504],{"name":4402,"slug":4403,"type":15},{"name":4405,"slug":4406,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},{"slug":4411,"name":4411,"fn":4412,"description":4413,"org":4506,"tags":4507,"stars":20,"repoUrl":21,"updatedAt":4422},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4508,4509,4510,4511],{"name":4402,"slug":4403,"type":15},{"name":13,"slug":14,"type":15},{"name":4419,"slug":4420,"type":15},{"name":9,"slug":8,"type":15},{"slug":4424,"name":4424,"fn":4425,"description":4426,"org":4513,"tags":4514,"stars":20,"repoUrl":21,"updatedAt":4435},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4515,4516,4517,4518],{"name":4402,"slug":4403,"type":15},{"name":13,"slug":14,"type":15},{"name":4432,"slug":4433,"type":15},{"name":9,"slug":8,"type":15},{"slug":4437,"name":4437,"fn":4438,"description":4439,"org":4520,"tags":4521,"stars":20,"repoUrl":21,"updatedAt":4455},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4522,4523,4524,4525,4526],{"name":4443,"slug":4444,"type":15},{"name":4446,"slug":4447,"type":15},{"name":4449,"slug":4450,"type":15},{"name":9,"slug":8,"type":15},{"name":4453,"slug":4454,"type":15},{"slug":4457,"name":4457,"fn":4458,"description":4459,"org":4528,"tags":4529,"stars":20,"repoUrl":21,"updatedAt":4468},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4530,4531,4532,4533],{"name":4402,"slug":4403,"type":15},{"name":13,"slug":14,"type":15},{"name":4465,"slug":4466,"type":15},{"name":9,"slug":8,"type":15},{"slug":4384,"name":4384,"fn":4470,"description":4471,"org":4535,"tags":4536,"stars":20,"repoUrl":21,"updatedAt":4481},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4537,4538,4539,4540],{"name":4475,"slug":4384,"type":15},{"name":4477,"slug":4478,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},{"slug":4483,"name":4483,"fn":4484,"description":4485,"org":4542,"tags":4543,"stars":20,"repoUrl":21,"updatedAt":4495},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4544,4545,4546,4547],{"name":13,"slug":14,"type":15},{"name":4490,"slug":4483,"type":15},{"name":4492,"slug":4493,"type":15},{"name":9,"slug":8,"type":15},{"slug":4549,"name":4549,"fn":4550,"description":4551,"org":4552,"tags":4553,"stars":20,"repoUrl":21,"updatedAt":4559},"client-setup","set up vanilla tRPC clients","Create a vanilla tRPC client with createTRPCClient\u003CAppRouter>(), configure link chain with httpBatchLink\u002FhttpLink, dynamic headers for auth, transformer on links (not client constructor). Infer types with inferRouterInputs and inferRouterOutputs. AbortController signal support. TRPCClientError typing.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4554,4555,4558],{"name":4402,"slug":4403,"type":15},{"name":4556,"slug":4557,"type":15},"Frontend","frontend",{"name":9,"slug":8,"type":15},"2026-07-18T05:48:11.437946",{"slug":4373,"name":4373,"fn":4561,"description":4562,"org":4563,"tags":4564,"stars":20,"repoUrl":21,"updatedAt":4572},"implement typed error handling in tRPC","Throw typed errors with TRPCError and error codes (NOT_FOUND, UNAUTHORIZED, BAD_REQUEST, INTERNAL_SERVER_ERROR), configure errorFormatter for client-side Zod error display, handle errors globally with onError callback, map tRPC errors to HTTP status codes with getHTTPStatusCodeFromError().\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4565,4566,4569,4570],{"name":13,"slug":14,"type":15},{"name":4567,"slug":4568,"type":15},"Debugging","debugging",{"name":9,"slug":8,"type":15},{"name":4571,"slug":31,"type":15},"TypeScript","2026-07-18T05:46:52.798151",{"slug":4574,"name":4574,"fn":4575,"description":4576,"org":4577,"tags":4578,"stars":20,"repoUrl":21,"updatedAt":4582},"links","configure tRPC client link chains","Configure the tRPC client link chain: httpLink, httpBatchLink, httpBatchStreamLink, splitLink, loggerLink, wsLink, createWSClient, httpSubscriptionLink, unstable_localLink, retryLink. Choose the right terminating link. Route subscriptions via splitLink. Build custom links for SOA routing. Link options: url, headers, transformer, maxURLLength, maxItems, connectionParams, EventSource ponyfill.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4579,4580,4581],{"name":4402,"slug":4403,"type":15},{"name":4556,"slug":4557,"type":15},{"name":9,"slug":8,"type":15},"2026-07-18T05:47:06.847309",{"slug":4,"name":4,"fn":5,"description":6,"org":4584,"tags":4585,"stars":20,"repoUrl":21,"updatedAt":22},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4586,4587,4588],{"name":13,"slug":14,"type":15},{"name":18,"slug":19,"type":15},{"name":9,"slug":8,"type":15},{"slug":4590,"name":4590,"fn":4591,"description":4592,"org":4593,"tags":4594,"stars":20,"repoUrl":21,"updatedAt":4602},"nextjs-app-router","implement tRPC in Next.js App Router","Full end-to-end tRPC setup for Next.js App Router. Covers route handler with fetchRequestHandler (GET + POST exports), TRPCProvider with QueryClientProvider, createTRPCOptionsProxy for RSC prefetching, HydrateClient\u002FHydrationBoundary for hydration, useSuspenseQuery for Suspense, and server-side callers.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[4595,4596,4597,4600,4601],{"name":13,"slug":14,"type":15},{"name":4556,"slug":4557,"type":15},{"name":4598,"slug":4599,"type":15},"Next.js","next-js",{"name":9,"slug":8,"type":15},{"name":4571,"slug":31,"type":15},"2026-07-18T05:47:10.468453"]