Anyone know what is the request and response handler type in fastify?
Now I am just using 'any', typescript eslint gave me a warning:
fastify.post('/ac', async(req: any , res: any) => { 
- What version are you using?Manuel Spigolon– Manuel Spigolon2020-09-06 20:32:20 +00:00Commented Sep 6, 2020 at 20:32
- I am using version 3.Alvin– Alvin2020-09-09 08:30:29 +00:00Commented Sep 9, 2020 at 8:30
- @Alvin can you try with tslint instead of eslintRafael– Rafael2021-05-29 11:55:42 +00:00Commented May 29, 2021 at 11:55
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2 Answers
The appropriate types you're looking for are "FastifyRequest" and "FastifyReply", respectively.
They can be imported and implemented as shown below.
import { FastifyInstance, FastifyReply, FastifyRequest } from 'fastify'; fastify.post('/ac', async (req: FastifyRequest, res: FastifyReply) => { }); 
5 Comments
Alvin
When I try to access req.body.object, it prompted err at object - Property 'object' does not exist on type 'unknown'.ts(2339)
kevlarr
fastify.io/docs/latest/TypeScript/#request is helpful (the
type CustomRequest = FastifyRequest<{ Body: .. }> part) for getting the req body typed
eazy_beans
Updated url for above comment: fastify.io/docs/latest/Reference/TypeScript/#request
Eggcellentos
why was this so hard to find??
Melroy van den Berg
It's still the wrong answer, see my answer below.
The correct answer should be to use an interface (eg. IPostUser) on Body, no need to create a whole custom request object, just do:
interface IPostUser { username: string } fastify.post('/:id', async (req: FastifyRequest<{ Params: { id: number }; Body: IPostUser }>, reply) => { console.log(req.params.id) console.log(req.body) }) Or even better, you do not want to refine the types again in TypeScript if you also created a Fastify JSON schema. Yes, you really should use schemas!
In that case, you can better use Type Providers in Fastify, like the package @fastify/type-provider-json-schema-to-ts.
