POST method to upload file with json object in python flask app

Question

I am stuck in a problem where I am trying to build single API which will upload file along with json object. I need this API to create webhook.

Using multi part, I am able to upload file and in option filed I am able to send json object.

In flask app when I am trying to retrieve json object its converting as blob type. I tried to convert it base64 then again converting into string but whole process is not working.

Let me know if anyone has good solution I can combine file and json object together and fetch it by flask python app.

zz is the variable in my code where I am trying to store my json object. name is the field where I am passing my json object with file.

Thanks in advance.

My current code

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER @app.route('/upload/',methods = ['POST']) def upload(): customer_name='abc' if request.method == 'POST': zz=base64.b64encode(request.files['name'].read()) try: file = request.files['file'] if file: file.filename=customer_name+'_'+str(datetime.now())+'.'+file.filename.split('.')[-1] filename = secure_filename(file.filename) path=os.path.join(app.config['UPLOAD_FOLDER'], filename) file.save(path) return jsonify({ 'status':success, 'junk_data':[], 'message':error }) except Exception as err: logger.error(str(datetime.now())+' '+str(err)) return jsonify({ 'status':False, 'junk_data':[], 'message':str(err) }) if __name__ == '__main__': app.run(host='localhost',debug=True, use_reloader=True,port=5000)

Ashish Gupta · Accepted Answer · 2019-07-01 07:15:53Z

I have got the answer after lot R&D.

request format

//user any client-side content-type:multipart/form-data file: file need to upload data: {"name":"abc","new_val":1}

python code to fetch from request object

data=json.loads(request.form.get('data')) file = request.files['file']

Jethro Sandoval · Accepted Answer · 2019-06-26 07:01:37Z

Just send the file and json at once and let request handle the rest. You can try the code below:

Server side:

import json import os from flask import Flask, request from werkzeug import secure_filename app = Flask(__name__) @app.route('/test_api',methods=['GET','POST']) def test_api(): uploaded_file = request.files['document'] data = json.load(request.files['data']) filename = secure_filename(uploaded_file.filename) uploaded_file.save(os.path.join('path/where/to/save', filename)) print(data) return 'success' if __name__ == '__main__': app.run(host='localhost', port=8080)

Client Side:

import json import requests data = {'test1':1, 'test2':2} filename = 'test.txt' with open(filename, 'w') as f: f.write('this is a test file\n') url = "http://localhost:8080/test_api" files = [ ('document', (filename, open(filename, 'rb'), 'application/octet')), ('data', ('data', json.dumps(data), 'application/json')), ] r = requests.post(url, files=files) print(r)

I have tied with this solution. request.files['data'] its showing <FileStorage: 'blob' ('application/json')> not able to convert it back to json
If you have NameError: name 'secure_filename' is not defined. There are two solutions: 1. Change from werkzeug import secure_filename to from werkzeug.utils import secure_filename 2. pip install -U Werkzeug==0.16.0

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