python – Get the data received in a Flask request

python – Get the data received in a Flask request

The docs describe the attributes available on the request object (from flask import request) during a request. In most common cases request.data will be empty because its used as a fallback:

request.data Contains the incoming request data as string in case it came with a mimetype Flask does not handle.

• request.args: the key/value pairs in the URL query string
• request.form: the key/value pairs in the body, from a HTML post form, or JavaScript request that isnt JSON encoded
• request.files: the files in the body, which Flask keeps separate from form. HTML forms must use enctype=multipart/form-data or files will not be uploaded.
• request.values: combined args and form, preferring args if keys overlap
• request.json: parsed JSON data. The request must have the application/json content type, or use request.get_json(force=True) to ignore the content type.

All of these are MultiDict instances (except for json). You can access values using:

• request.form[name]: use indexing if you know the key exists
• request.form.get(name): use get if the key might not exist
• request.form.getlist(name): use getlist if the key is sent multiple times and you want a list of values. get only returns the first value.

To get the raw data, use request.data. This only works if it couldnt be parsed as form data, otherwise it will be empty and request.form will have the parsed data.

from flask import request
request.data

python – Get the data received in a Flask request

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()