Develop Reference

Why can't I send a form data from axios?

I am consuming an api that asks me to send a filter series within a formData, when doing the tests from Postman everything works without problem, I tried with other libraries and it also works without problem, but when trying to do it from axios the information does not return with the filters.
This is the code I am using:
const axios = require('axios');
const FormData = require('form-data');
let data = new FormData();
data.append('filtro_grafica', '2,0,0,0');
let config = {
method: 'get',
url: 'https://thisismyurl/filter',
headers: {
'Authorization': 'JWT MYTOKEN',
...data.getHeaders()
},
data : data
};
axios(config)
.then((response) => {
console.log(JSON.stringify(response.data));
})
.catch((error) => {
console.log(error);
});

You can send Form-data using get method, but the most servers, will reject the form data.
However it is not recommended anymore. The reason is, first because it is visible in the URL and browsers can cache them in it’s history backstacks, and second reason is because browsers have some limitations over the maximum number of characters in url.
If you are to send only few fields/input in the forms you can use it but if you have multiple inputs you should avoid it and use POST instead.
At the end it depends on your own usecase. Technically both GET and POST are fine to send data to server.
replace get with post
const axios = require('axios');
const FormData = require('form-data');
let data = new FormData();
data.append('filtro_grafica', '2,0,0,0');
let config = {
method: 'post',
url: 'https://thisismyurl/filter',
headers: {
'Authorization': 'JWT MYTOKEN',
...data.getHeaders()
},
data : data
};
axios(config)
.then((response) => {
console.log(JSON.stringify(response.data));
})
.catch((error) => {
console.log(error);
});

Issue with sending FormData from backend

I have a component which processes and uploads images. Currently I process the image on my backend and then send it to my frontend and then upload it from there. I would like to do everything on my backend. The only issue is that the upload endpoint requires FormData() object. I found an npm package form-data which I'm using on my backend now, but I'm still getting error.
This is how it currently works:
// frontend logic:
const data = await uploadImage(img);
const file = new File([Buffer.from(data)], `img-${i}.webp`, {
type: "image/webp",
});
const formData = new FormData();
formData.append("path", "images");
formData.append("files", file, file.name);
await axios
.post("http://localhost:1338/api/upload", formData, {
headers: { authorization: `Bearer ${jwtToken}` },
})
.then(({ data }) => {
console.log(data);
})
.catch(console.log);
//
//
// backend logic:
const data = await processImage(img.url);
return data;
This is what im trying to do:
// frontend logic:
const data = await uploadImage(img);
//
//
// backend logic:
const data = await processImage(img.url);
const formData = new FormData();
formData.append("path", "images");
formData.append("files", data, "file.name");
await axios
.post("http://localhost:1338/api/upload", formData, {
headers: { authorization: `Bearer ${process.env.JWT_TOKEN}` },
})
.then(({ data }) => {
console.log(data);
})
.catch(console.log); // I get error: 413 Payload Too Large
I'm trying to do it with the same image which works with the first method. Perhaps I need to create a new File(), but I couldn't find any npm packages which worked for that. What should I do to get this working?

how to add file with formData in axios request using node.js [duplicate]

I have an API endpoint that lets the client post their csv to our server then post it to someone else server. I have done our server part which save uploaded file to our server, but I can't get the other part done. I keep getting error { message: 'File not found', code: 400 } which may mean the file never reach the server. I'm using axios as an agent, does anyone know how to get this done? Thanks.
// file = uploaded file
const form_data = new FormData();
form_data.append("file", fs.createReadStream(file.path));
const request_config = {
method: "post",
url: url,
headers: {
"Authorization": "Bearer " + access_token,
"Content-Type": "multipart/form-data"
},
data: form_data
};
return axios(request_config);
Update
As axios doc states as below and the API I'm trying to call requires a file
// data is the data to be sent as the request body
// Only applicable for request methods 'PUT', 'POST', and 'PATCH'
// When no transformRequest is set, must be of one of the following types:
// - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams
// - Browser only: FormData, File, Blob
// - Node only: Stream, Buffer
Is there any way to make axios send a file as a whole? Thanks.

The 2 oldest answers did not work for me. This, however, did the trick:
const FormData = require('form-data'); // npm install --save form-data
const form = new FormData();
form.append('file', fs.createReadStream(file.path));
const request_config = {
headers: {
'Authorization': `Bearer ${access_token}`,
...form.getHeaders()
}
};
return axios.post(url, form, request_config);
form.getHeaders() returns an Object with the content-type as well as the boundary.
For example:
{ "content-type": "multipart/form-data; boundary=-------------------0123456789" }

I'm thinking the createReadStream is your issue because its async. try this.
Since createReadStream extends the event emitter, we can "listen" for when it finishes/ends.
var newFile = fs.createReadStream(file.path);
// personally I'd function out the inner body here and just call
// to the function and pass in the newFile
newFile.on('end', function() {
const form_data = new FormData();
form_data.append("file", newFile, "filename.ext");
const request_config = {
method: "post",
url: url,
headers: {
"Authorization": "Bearer " + access_token,
"Content-Type": "multipart/form-data"
},
data: form_data
};
return axios(request_config);
});

This is what you really need:
const form_data = new FormData();
form_data.append("file", fs.createReadStream(file.path));
const request_config = {
headers: {
"Authorization": "Bearer " + access_token,
"Content-Type": "multipart/form-data"
},
data: form_data
};
return axios
.post(url, form_data, request_config);

In my case, fs.createReadStream(file.path) did not work.
I had to use buffer instead.
const form = new FormData();
form.append('file', fs.readFileSync(filePath), fileName);
const config = {
headers: {
Authorization: `Bearer ${auth.access_token}`,
...form.getHeaders(),
},
};
axios.post(api, form.getBuffer(), config);

I have made an interceptor you can connect to axios to handle this case in node: axios-form-data. Any feedback would be welcome.
npm i axios-form-data
example:
import axiosFormData from 'axios-form-data';
import axios from 'axios';
// connect axiosFormData interceptor to axios
axios.interceptors.request.use(axiosFormData);
// send request with a file in it, it automatically becomes form-data
const response = await axios.request({
method: 'POST',
url: 'http://httpbin.org/post',
data: {
nonfile: 'Non-file value',
// if there is at least one streamable value, the interceptor wraps the data into FormData
file: createReadStream('somefile'),
},
});
// response should show "files" with file content, "form" with other values
// and multipart/form-data with random boundary as request header
console.log(response.data);

I had a same issue, I had a "pdf-creator-service" for generate PDF document from html.
I use mustache template engine for create HTML document - https://www.npmjs.com/package/mustache
Mustache.render function returns html as a string what do I need to do to pass it to the pdf-generator-service ? So lets see my suggestion bellow
//...
async function getPdfDoc(props: {foo: string, bar: string}): Promise<Buffer> {
const temlateFile = readFileSync(joinPath(process.cwd(), 'file.html'))
mustache.render(temlateFile, props)
const readableStream = this.getReadableStreamFromString(htmlString)
const formData = new FormData() // from 'form-data'
formData.append('file', options.file, { filename: options.fileName })
const formHeaders = formData.getHeaders()
return await axios.send<Buffer>(
{
method: 'POST',
url: 'https://pdf-generator-service-url/pdf',
data: formData,
headers: {
...formHeaders,
},
responseType: 'arraybuffer', // ! important
},
)
}
getReadableStreamFromString(str: string): Readable {
const bufferHtmlString = Buffer.from(str)
const readableStream = new Readable() // from 'stream'
readableStream._read = () => null // workaround error
readableStream.push(bufferHtmlString)
readableStream.push(null) // mark end of stream
return readableStream
}

For anyone who wants to upload files from their local filesystem (actually from anywhere with the right streams architecture) with axios and doesn't want to use any external packages (like form-data).
Just create a readable stream and plug it right into axios request function like so:
await axios.put(
url,
fs.createReadStream(path_to_file)
)
Axios accepts data argument of type Stream in node context.
Works fine for me at least in Node v.16.13.1 and with axios v.0.27.2

Can't upload image using Angular's HttpClient

I am able to upload an image perfectly fine using the native fetch POST:
let formData = new FormData();
formData.append('file', event.target.files[0]);
console.log(event.target.files[0]);
fetch('http://localhost:8080/file/upload', {
method: 'POST',
headers:{
'Authorization': 'Bearer ' + JWT
},
body:formData
}).then(response => console.log(response));
However, when I try this using Angular's HttpClient, the request fails since the 'Content-Type': 'multipart/form-data' is not added.
My Angular code:
The file where I'm calling the service:
this.fileSaverService.uploadImage(event.target.files[0]).subscribe(
(data)=>{
console.log(data);
},
(error) => {
console.log(error);
}
);
The fileSaverService:
uploadImage(fileToUpload) {
const endpoint = 'http://localhost:8080/file/upload';
const formData: FormData = new FormData();
formData.append('file', fileToUpload);
return this.api
.post(endpoint, formData, { headers: {'Content-Type': 'multipart/form-data'} });
}
The this.api:
post(endpoint: string, body: any, reqOpts: any = {}) {
reqOpts.headers = this.handleHeaders(reqOpts.headers);
return this.http.post(endpoint, JSON.stringify(body), reqOpts);
}
If I add the header manually when using HttpClient, I get this header without the boundary:
However the native fetch adds this header automatically with the boundary if I don't specify a header and this works perfectly:
What are my options here?

There are two problems with the code in your question:
By setting Content-Type to multipart/form-data yourself, the serialisation of your FormData will not result in the correct header with boundaries being set behind the scenes.
In your post function, you have JSON.stringify(body), which is converting your FormData object into a JSON string. After doing this, you're simply attempting to POST a string rather than a complete FormData object.

why I use fetch to upload img in react don't have fileName?

I use fetch to upload images in react,my code is like below:
let formData = new FormData();
let file = {uri: imgdata, type: 'multipart/form-data', name: '2_resources.jpg'};
formData.append("name", "name");
formData.append("mobile", "18381307123");
formData.append("content", "123654");
formData.append("resources", file,"2_resources.jpg");//mind this line
fetch(Config.report,
{
mode: 'cors',
method: "POST",
body: formData
})
.then(res => res.json())
.then((data) => {
console.log(data)
}
).catch((err) => {
console.log(err)
}
);
but,run it I get the request :
I have look for FormData API document on https://developer.mozilla.org/en-US/docs/Web/API/FormData
it have write below:
and the fetch used is :"isomorphic-fetch": "^2.2.1"
what should I do to use fetch upload images? thanks.

You are adding the file to the FormData object incorrectly. isomorphic-fetch wraps github's fetch polyfill. Looking at their docs shows that it should be:
handleFileUpload(event) {
var formData = new FormData();
formData.append('fileName', event.target.files[0]);
fetch('http://your-domain/upload',
{
mode: 'cors',
method: 'POST',
body: formData
}).then(function (response) {
console.log('response: ', response);
});
}
The field name on the server will be whatever you use as the key when appending formData. In the above example it will be 'fileName'. I also don't think you need to set the content-type and file name yourself. It should get set automatically.
In the above example, 'event' is the event fired from the input tag when the user upload the file:
<input type="file" onChange={this.handleFileUpload}/>