Requesting JSON input from Postman to run API

I am new to Postman.I have build Machine learning model and trying to predict the new data using api.I am using below code :

import pandas as pd
from flask import Flask,request,jsonify
import pickle

app = Flask(__name__)

@app.route('/model_prediction', methods = ['POST'])
def model_prediction():
    
    dic_data = request.form 
    file_path= dic_data["file_path"]
    print(file_path)
    input_data = request.json
    print(input_data)
    prediction_data = pd.DataFrame(input_data)
    prediction_data =prediction_data.T
    print(prediction_data)
    
    with open(file_path+'/decisiontree.pkl','rb') as f:
            model = pickle.load(f)
        
    prediction = model.predict(prediction_data)
    
    return jsonify('preidiction is :',prediction)

if __name__ == "__main__":
    app.run(debug=True)

While running this API on Postman, I want to get two input. One is file_path and another data in json format.Below is screenshot of how I am passing the values :

with the above process I am getting the below error as :

I am not able to identify the error here and got stuck.Can someone please help me to resolve this issue.

You cannot mix-and-match request.form and request.json. You can use one or the other, but not both at the same time. For a REST API, you should only use request.json. You can easily do this by accepting two keys: file_path and data. So you can do something like this in Postman using a "raw" body format:

{
    "file_path": "/path/to/the/file",
    "data": [ ...all the numbers here ... ]
}

Now in your code, you can access request.json['file_path'] and request.json['data'] to get each of these.

Although, I highly recommend against allowing the user to specify the file_path in the JSON. How are they supposed to know the path of a file on the server? And if they do, this opens a security risk because they can try to read a file anywhere in the system.