Nuxt 3 useFetch Post request: File object missing from server api route - post

Question

I am trying to post a file object to my nuxt 3 api route
Problem is:
Data from client has my file object
Data from server returns empty object
Screenshot of the issue
Where did my file object go?
const handleImageUpload = async (evt: Event) => {
const target = evt.target as HTMLInputElement
if (target.files) {
const file = target.files[0]
const upload: iUpload = {
name: file.name,
type: file.type,
file
}
console.log("data from client", upload)
try {
const { data, error } = await useFetch(constants.imageUploadApiUrl, {
headers: { "Content-type": "application/json" },
method: 'POST',
body: upload
})
console.log("data from server", data.value)
} catch (error) {
console.log(error)
}
}
}
constants.imageUploadApiUrl (api route) has the following
import { getQuery, readBody } from "h3"
import { iUpload } from "~~/helpers/interfaces"
export default defineEventHandler(async (event) => {
try {
const query = getQuery(event)
const body = await readBody(event) as iUpload
return { body }
} catch (error: any) {
return { error: error.message }
}
})
iUpload interface is this
export interface iUpload {
name: string;
type: string;
file: File;
}

Answer 1

I eventually got it working. Meanwhile it's using supabase as it's backend (forgot to mention that).
But here are the changes I made.
#1 - I added a utility function to convert the file to base64 string
export const getBase64 = (file: File) => {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => resolve(reader.result);
reader.onerror = error => reject(error);
});
}
#2 - I updated the handleImageUpload function like below. The only change being in the file key
const handleImageUpload = async (evt: Event) => {
const target = evt.target as HTMLInputElement
if (target.files) {
const fileObj = target.files[0]
const upload: iUpload = {
path: id(memberName(store.selected), '-'),
name: fileObj.name,
file: await getBase64(fileObj) as string, // <**=**
type: fileObj.type
}
console.log("data from client", upload)
try {
const { data, error } = await useFetch(constants.imageUploadApiUrl, {
headers: { "Content-type": "multipart/form-data" },
method: 'POST',
body: upload
})
console.log("data from server", data.value)
} catch (error) {
console.log(error)
}
}
}
#3 - Furthermore I updated the server route as follows:
export default defineEventHandler(async (event) => {
try {
const body = await readBody(event) as iUpload
const filePath = `${body.path}/${body.name}`
const res = await fetch(body.file)
const blob = await res.blob()
const response = await supabase.storage
.from("pictures")
.upload(filePath, blob, {
contentType: body.type,
upsert: true,
})
return {
data: response.data,
error: response.error?.message,
}
} catch (error: any) {
return { error: error.message }
}
})
#4 - Lastly I updated the policies on supabase storage bucket and storage object to the following:
supabase storage policy update