Fastify + Typebox Example

incoming-request.dto.ts

import { Type, Static } from '@sinclair/typebox';

export const SendTextMessage = Type.Object({
  body: Type.String(),
  chatId: Type.Number(),
  options: Type.Optional(
    Type.Object({ previewUrl: Type.Optional(Type.Boolean()) }),
  ),
});

export type SendTextMessage = Static<typeof SendTextMessage>;

index.ts

import Fastify from 'fastify';
import { SendTextMessage } from './incoming-request.dto';

const fastify = Fastify();

fastify.post(
  '/message',
  {
    schema: SendTextMessage,
    handler: async (
      { body }: FastifyRequest<{ Body: SendTextMessage }>,
      reply: FastifyReply,
    ): Promise<void> => {
      reply.code(200).send({});
    },
  },
);

fastify.listen(3000, (err) => {
  if (err) throw err;
});