uploading post json request and reading it on the server

Question

How do I send a json POST request using Javascript and read it on a flask server?

Last approach (reference):

const uploadjson = storeDictionary const url = "/uploadset/"+setName fetch(url, {method: 'POST', // or 'PUT' headers: { 'Content-Type': 'application/json', }, body: uploadjson}) .then((response) => response.json()) .then((data) => { console.log('Success:', uploadjson); }) .catch((error) => { console.error('Error:', error); console.log("Data:", uploadjson) });

It results in the following error message:

Here's a part of the python code (flask) I wrote with help from the documentation:

@app.route("/uploadset/<name>", methods=['GET','POST']) def uploads(name): if flask.request.method == "POST": print("Upload!") if 'id' in flask.session: if flask.session['id'] in client: sessid = flask.session['id'] if name != "": print("flask.request.files", flask.request.files) file = flask.request.files['file'] try: if processUploadedSet(): error = False success = True

This results into a "server didn't understand your request".

I found out that the flask server is the problem:

Here's the server log:

If I return an empty string on the server the request works 'fine'. How do I read json data using flask which was sent using the javascript?

"This json file..." - is a plain object. The only actual JSON in your question/script is the content of storeDictionary — Andreas
– Andreas, Commented Aug 16, 2022 at 16:13
"I made a site which looks like this:..." - Which is not relevant for the question. The markup on the other hand might contain some relevant information. — Andreas
– Andreas, Commented Aug 16, 2022 at 16:14
There's no such thing as a JSON object. You called an object "json file", both words are wrong. It's neither json nor a file, it's an object in memory. Doesn't matter, the issue is response.json() while the response isn't JSON — user5734311
– user5734311, Commented Aug 16, 2022 at 16:24
flask.request.files reads the files from multipart/form-data request, but the client sends a simple JSON request. You can read it with flask.request.get_json — user16540390
– user16540390, Commented Aug 16, 2022 at 16:46

france1 · Accepted Answer · 2022-08-17 13:53:58Z

You can read a json response in flask using flask.request.get_json

Simply replace file = flask.request.files['file']

with file = flask.request.get_json(cache=False)

Sending a json POST request is not the same as sending a file!

Collectives™ on Stack Overflow

uploading post json request and reading it on the server

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related