Fastify-mulipart schema validation with typebox

[mahendraHegde]

💬 Example for typescript + fastify-multipart + typebox schema validation

I'm using fastify-multipart for file upload, and other form data, but i dont see any example how to use the schema validation with typebox

any help would be appreciated

• node version: 14
• fastify version: >=3.18.0
• os: Mac
• fastify-multipart : ^4.0.7
• @sinclair/typebox: ^0.16.7

[Eomm]

What did you try so far? Are you having some errors?

I have not used this module

[mahendraHegde]

Thanks for the response @Eomm , At the time of posting the question i had no clue how to proceed, but later I checked the fastify-multipart's internal js implementation for schema validation, I ported the same to typebox, but i couldn't find the right way to handle file stream with typebox

const ImageUploadForm = Type.Object({
  image: Type.Object({
    encoding: Type.String(),
    filename: Type.String(),
    mimetype: Type.Optional(Type.String()),
    file: Type.Any(),  //any better way??
    type: Type.Optional(Type.String()),
  }),
  description: Type.Optional(
    Type.Object({
      value: Type.String(),
    })
  ),
});

export type ImageUploadFormType = Static<typeof ImageUploadForm>;

export const uploadPhotoSchema = {
  body: ImageUploadForm,
  response: {
    204: {},
  },
} as const;

now i can access req.body.image.file buffer.

the above validation is working. I'm looking for a better way to validate req.body.image.file , I'm not sure how to do it with typebox.

[climba03003]

the above validation is working. I'm looking for a better way to validate req.body.image.file , I'm not sure how to do it with typebox.

I think we should accept that validating multipart with files is not a great idea. As file is not a buffer string, there are no default type for ajv to accept or validate it. You may need a custom validator or keyword.

https://github.com/ajv-validator/ajv/issues/1555 https://github.com/ajv-validator/ajv/issues/1556