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","https:\u002F\u002Fgithub.com\u002Ftrpc\u002Ftrpc\u002Ftree\u002FHEAD\u002Fpackages\u002Fserver\u002Fskills\u002Fadapter-fastify","---\nname: adapter-fastify\ndescription: >\n Mount tRPC as a Fastify plugin with fastifyTRPCPlugin from\n @trpc\u002Fserver\u002Fadapters\u002Ffastify. Configure prefix, trpcOptions (router,\n createContext, onError). Enable WebSocket subscriptions with useWSS and\n @fastify\u002Fwebsocket. Set routerOptions.maxParamLength for batch requests.\n Requires Fastify v5+. FastifyTRPCPluginOptions for type-safe onError.\n CreateFastifyContextOptions provides req, res.\ntype: core\nlibrary: trpc\nlibrary_version: '11.16.0'\nrequires:\n - server-setup\nsources:\n - www\u002Fdocs\u002Fserver\u002Fadapters\u002Ffastify.md\n - examples\u002Ffastify-server\u002F\n---\n\n# tRPC — Adapter: Fastify\n\n## Setup\n\n```ts\n\u002F\u002F server.ts\nimport { initTRPC } from '@trpc\u002Fserver';\nimport {\n fastifyTRPCPlugin,\n FastifyTRPCPluginOptions,\n} from '@trpc\u002Fserver\u002Fadapters\u002Ffastify';\nimport type { CreateFastifyContextOptions } from '@trpc\u002Fserver\u002Fadapters\u002Ffastify';\nimport fastify from 'fastify';\nimport { z } from 'zod';\n\nfunction createContext({ req, res }: CreateFastifyContextOptions) {\n return { req, res };\n}\ntype Context = Awaited\u003CReturnType\u003Ctypeof createContext>>;\n\nconst t = initTRPC.context\u003CContext>().create();\n\nconst appRouter = t.router({\n greet: t.procedure\n .input(z.object({ name: z.string() }))\n .query(({ input }) => ({ greeting: `Hello, ${input.name}!` })),\n});\n\nexport type AppRouter = typeof appRouter;\n\nconst server = fastify({\n routerOptions: {\n maxParamLength: 5000,\n },\n});\n\nserver.register(fastifyTRPCPlugin, {\n prefix: '\u002Ftrpc',\n trpcOptions: {\n router: appRouter,\n createContext,\n onError({ path, error }) {\n console.error(`Error in tRPC handler on path '${path}':`, error);\n },\n } satisfies FastifyTRPCPluginOptions\u003CAppRouter>['trpcOptions'],\n});\n\n(async () => {\n try {\n await server.listen({ port: 3000 });\n console.log('Listening on http:\u002F\u002Flocalhost:3000');\n } catch (err) {\n server.log.error(err);\n process.exit(1);\n }\n})();\n```\n\n## Core Patterns\n\n### WebSocket subscriptions with @fastify\u002Fwebsocket\n\n```ts\nimport ws from '@fastify\u002Fwebsocket';\nimport {\n fastifyTRPCPlugin,\n FastifyTRPCPluginOptions,\n} from '@trpc\u002Fserver\u002Fadapters\u002Ffastify';\nimport fastify from 'fastify';\nimport { createContext } from '.\u002Fcontext';\nimport { appRouter, type AppRouter } from '.\u002Frouter';\n\nconst server = fastify({\n routerOptions: { maxParamLength: 5000 },\n});\n\n\u002F\u002F Register @fastify\u002Fwebsocket BEFORE the tRPC plugin\nserver.register(ws);\n\nserver.register(fastifyTRPCPlugin, {\n prefix: '\u002Ftrpc',\n useWSS: true,\n trpcOptions: {\n router: appRouter,\n createContext,\n keepAlive: {\n enabled: true,\n pingMs: 30000,\n pongWaitMs: 5000,\n },\n } satisfies FastifyTRPCPluginOptions\u003CAppRouter>['trpcOptions'],\n});\n\nserver.listen({ port: 3000 });\n```\n\nInstall: `npm install @fastify\u002Fwebsocket` (minimum version 3.11.0)\n\n### Type-safe onError with satisfies\n\n```ts\nserver.register(fastifyTRPCPlugin, {\n prefix: '\u002Ftrpc',\n trpcOptions: {\n router: appRouter,\n createContext,\n onError({ path, error, type, input }) {\n console.error(`[${type}] ${path}:`, error.message);\n },\n } satisfies FastifyTRPCPluginOptions\u003CAppRouter>['trpcOptions'],\n});\n```\n\nDue to Fastify plugin type inference limitations, use `satisfies FastifyTRPCPluginOptions\u003CAppRouter>['trpcOptions']` to get correct types on `onError` and other callbacks.\n\n### Limiting batch size with maxBatchSize\n\n```ts\nserver.register(fastifyTRPCPlugin, {\n prefix: '\u002Ftrpc',\n trpcOptions: {\n router: appRouter,\n createContext,\n maxBatchSize: 10,\n } satisfies FastifyTRPCPluginOptions\u003CAppRouter>['trpcOptions'],\n});\n```\n\nRequests batching more than `maxBatchSize` operations are rejected with a `400 Bad Request` error. Set `maxItems` on your client's `httpBatchLink` to the same value to avoid exceeding the limit.\n\n## Common Mistakes\n\n### HIGH Registering @fastify\u002Fwebsocket after tRPC plugin\n\nWrong:\n\n```ts\nserver.register(fastifyTRPCPlugin, {\n useWSS: true,\n trpcOptions: { router: appRouter, createContext },\n});\nserver.register(ws); \u002F\u002F too late!\n```\n\nCorrect:\n\n```ts\nserver.register(ws); \u002F\u002F register FIRST\nserver.register(fastifyTRPCPlugin, {\n useWSS: true,\n trpcOptions: { router: appRouter, createContext },\n});\n```\n\nThe WebSocket plugin must be registered before the tRPC plugin. Reverse order causes WebSocket routes to not be recognized.\n\nSource: www\u002Fdocs\u002Fserver\u002Fadapters\u002Ffastify.md\n\n### HIGH Missing maxParamLength for batch requests\n\nWrong:\n\n```ts\nconst server = fastify();\n```\n\nCorrect:\n\n```ts\nconst server = fastify({\n routerOptions: { maxParamLength: 5000 },\n});\n```\n\nFastify defaults to `maxParamLength: 100`. Batch requests from `httpBatchLink` encode multiple procedure names in the URL path parameter, which easily exceeds 100 characters and returns a 404.\n\nSource: www\u002Fdocs\u002Fserver\u002Fadapters\u002Ffastify.md\n\n### CRITICAL Using Fastify v4 with tRPC v11\n\nWrong:\n\n```json\n{ \"dependencies\": { \"fastify\": \"^4.0.0\" } }\n```\n\nCorrect:\n\n```json\n{ \"dependencies\": { \"fastify\": \"^5.0.0\" } }\n```\n\ntRPC v11 requires Fastify v5+. 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