Get the data received in a Flask request

To get the raw data, use request.data. This only works if it couldn’t be parsed as form data, otherwise it will be empty and request.form will have the parsed data.

from flask import request
request.data

For URL query parameters, use request.args.

search = request.args.get("search")
page = request.args.get("page")

For posted form input, use request.form.

email = request.form.get('email')
password = request.form.get('password')

For JSON posted with content type application/json, use request.get_json().

data = request.get_json()

If you post JSON with content type application/json, use request.get_json() to get it in Flask. If the content type is not correct, None is returned. If the data is not JSON, an error is raised.

@app.route("/something", methods=["POST"])
def do_something():
    data = request.get_json()

To get the raw post body regardless of the content type, use request.get_data(). If you use request.data, it calls request.get_data(parse_form_data=True), which will populate the request.form MultiDict and leave data empty.

The raw data is passed in to the Flask application from the WSGI server as request.stream. The length of the stream is in the Content-Length header.

length = request.headers["Content-Length"]
data = request.stream.read(length)

It is usually safer to use request.get_data() instead.

Here’s an example of parsing posted JSON data and echoing it back.

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/foo', methods=['POST']) 
def foo():
    data = request.json
    return jsonify(data)

To post JSON with curl:

curl -i -H "Content-Type: application/json" -X POST -d '{"userId":"1", "username": "fizz bizz"}' http://localhost:5000/foo

Or to use Postman:

To parse JSON, use request.get_json().

@app.route("/something", methods=["POST"])
def do_something():
    result = handle(request.get_json())
    return jsonify(data=result)

To get JSON posted without the application/json content type, use request.get_json(force=True).

@app.route('/process_data', methods=['POST'])
def process_data():
    req_data = request.get_json(force=True)
    language = req_data['language']
    return 'The language value is: {}'.format(language)

To post JSON with jQuery in JavaScript, use JSON.stringify to dump the data, and set the content type to application/json.

var value_data = [1, 2, 3, 4];

$.ajax({
    type: 'POST',
    url: '/process',
    data: JSON.stringify(value_data),
    contentType: 'application/json',
    success: function (response_data) {
        alert("success");
    }   
});

Parse it in Flask with request.get_json().

data = request.get_json()

To get request.form as a normal dictionary , use request.form.to_dict(flat=False).

To return JSON data for an API, pass it to jsonify.

This example returns form data as JSON data.

@app.route('/form_to_json', methods=['POST'])
def form_to_json():
    data = request.form.to_dict(flat=False)
    return jsonify(data)

Here’s an example of POST form data with curl, returning as JSON:

$ curl http://127.0.0.1:5000/data -d "name=ivanleoncz&role=Software Developer"
{
  "name": "ivanleoncz", 
  "role": "Software Developer"
}

When posting form data with an HTML form, be sure the input tags have name attributes, otherwise they won’t be present in request.form.

@app.route('/', methods=['GET', 'POST'])
def index():
    print(request.form)
    return """
<form method="post">
    <input type="text">
    <input type="text" id="txt2">
    <input type="text" name="txt3" id="txt3">  
    <input type="submit">
</form>
"""

ImmutableMultiDict([('txt3', 'text 3')])

Only the txt3 input had a name, so it’s the only key present in request.form.

If the content type is recognized as form data, request.data will parse that into request.form and return an empty string.

To get the raw data regardless of content type, call request.get_data(). request.data calls get_data(parse_form_data=True), while the default is False if you call it directly.

If the body is recognized as form data, it will be in request.form. If it’s JSON, it will be in request.get_json(). Otherwise the raw data will be in request.data. If you’re not sure how data will be submitted, you can use an or chain to get the first one with data.

def get_request_data():
    return (
        request.args
        or request.form
        or request.get_json(force=True, silent=True)
        or request.data
    )

request.args contains args parsed from the query string, regardless of what was in the body, so you would remove that from get_request_data() if both it and a body should data at the same time.

Use request.get_json() to get posted JSON data.

data = request.get_json()
name = data.get('name', '')

Use request.form to get data when submitting a form with the POST method.

name = request.form.get('name', '')

Use request.args to get data passed in the query string of the URL, like when submitting a form with the GET method.

request.args.get("name", "")

request.form etc. are dict-like, use the get method to get a value with a default if it wasn’t passed.

Here’s an example of posting form data to add a user to a database. Check request.method == "POST" to check if the form was submitted. Use keys from request.form to get the form data. Render an HTML template with a <form> otherwise. The fields in the form should have name attributes that match the keys in request.form.

from flask import Flask, request, render_template

app = Flask(__name__)

@app.route("/user/add", methods=["GET", "POST"])
def add_user():
    if request.method == "POST":
        user = User(
            username=request.form["username"],
            email=request.form["email"],
        )
        db.session.add(user)
        db.session.commit()
        return redirect(url_for("index"))

    return render_template("add_user.html")

<form method="post">
    <label for="username">Username</label>
    <input type="text" name="username" id="username">
    <label for="email">Email</label>
    <input type="email" name="email" id="email">
    <input type="submit">
</form>

@app.route('/addData', methods=['POST'])
def add_data():
     data_in = mongo.db.Data
     id = request.values.get("id")
     name = request.values.get("name")
     newuser = {'id' : id, 'name' : name}
     if voter.find({'id' : id, 'name' : name}).count() > 0:
            return "Data Exists"
     else:
            data_in.insert(newuser)
            return "Data Added"

When writing a Slack bot, which is supposed to send JSON data, I got a payload where the Content-Type was application/x-www-form-urlencoded.

I tried request.get_json() and it didn’t work.

@app.route('/process_data', methods=['POST'])
def process_data():
   req_data = request.get_json(force=True)

Instead I used request.form to get the form data field that contained JSON, then loaded that.

from flask import json

@ app.route('/slack/request_handler', methods=['POST'])
def request_handler():
   req_data = json.loads(request.form["payload"])

request.data

This is great to use but remember that it comes in as a string and will need iterated through.

Import request:

from flask import request

URL query parameters:

name = request.args.get("name")
age = request.args.get("age")

Form Input:

name = request.form.get('name')
age = request.form.get('age')

OR (use indexing if you know the key exists, specify the name of input fields)

name = request.form['name']
age = request.form['age']

JSON Data (for content type application/json)

data = request.get_json()

Try – >

from flask import request

@app.route('/', methods=['GET', 'POST'])
def parse_request():
    if request.method == 'POST':
       data = request.form.get('data')

You can get request data from

1. request.form for form data, this includes form and file data,
2. request.json and request.get_json for JSON data
3. request.headers for headers
4. request.args to get query params

They’re all like a dictionary, use request.form['name'] if you know the key exists, or request.form.get('name') if it is optional.

I just faced the same need. I have to save information in case of any unexpected situation. So, I use the following formula:

Info = "%s/%s/%s" % (request.remote_addr, repr(request), repr(session))

repr(request) will give a string representation of the basic information. You could add user-agent data with:
request.headers.get(‘User-Agent’)

I also save the session continent as it could contain valuable information

With all these good answers, is still couldn’t find why it didn’t work for me.
The solution was in debugging.
Though this is not "THE" answer, this is a link to the video that helped me debug my work on vscode, and therefore find the right way to get the data passed from ajax

https://www.youtube.com/watch?v=rD5SqP1nj1o