not able to get file form the form data in flask server

Question

i am trying to upload a form data in js into my flask server but i am not getting file in the server.

My code in JS is:

 const form = document.forms.namedItem('fileinfo')
        form.addEventListener('submit', async (event) => {
            event.preventDefault()
            let formData = new FormData(form)
            formData.append('firstName', 'John')
            let file1 = document.getElementById('fileInput').files[0]
            console.log(formData)
            let response = await fetch('http://127.0.0.1:5000/stateUpload', {
                method: 'POST',
                body: formData,
            })
            let _response = await response.json()
        })

and this is my flask code:

@app.route("/stateUpload", methods=[ "POST"])
def stateUpload():
    _data = request.form.to_dict(flat=False)
     print("this is form data")
     print(_data)
     return "JSON File successfully uploaded"

This is my output in console in server when i press submit button:

this is form data
{'firstName': ['John']}

and this is my output in front end:

i am not able to get this file in the flask

score 0 · Accepted Answer · answered Oct 21 '22 at 09:17

In contrast to normal form fields, which can be accessed via request.form, it is necessary to use request.files on the server side in order to receive transmitted files. Here you can request an object of type FileStorage using the name of the form field.

@app.route("/stateUpload", methods=[ "POST"])
def stateUpload():
    _data = request.form.to_dict(flat=False)
    print("this is form data")
    print(_data)
    file = request.files.get('file')
    print(file)
    return "JSON File successfully uploaded"

The documentation for uploading files can be found here.

not able to get file form the form data in flask server

1 Answers1