The provided code is a Flask-based API application that exposes...

September 4, 2025 at 10:25 AM

from flask import Flask, request, jsonify
import math
 
app = Flask(__name__)
 
@app.route("/emi-calc-endpoint", methods=["POST"])
def emi_calc():
    data = request.json.get("values", {})
    amount = data.get("amount")
    interest = data.get("interest")
    tenure = data.get("tenure")
 
    try:
        P = float(amount)
        R = float(interest) / 12 / 100  # Monthly interest rate
        N = int(tenure)  # Number of months
 
        # EMI Formula
        emi = (P * R * math.pow(1 + R, N)) / (math.pow(1 + R, N) - 1)
 
        return jsonify({
            "version": "7.2",
            "data": {
                "emi_result": f"₹ {emi:.2f}",
                "rate": f"{interest}% pa"
            }
        })
    except Exception as e:
        return jsonify({"error": str(e)}), 400
 
 
if __name__ == "__main__":
    app.run(debug=True)
    
    #What will be the request with example.

The provided code is a Flask-based API application that exposes an endpoint /emi-calc-endpoint for calculating the Equated Monthly Installment (EMI) for a loan based on the principal loan amount, annual interest rate, and tenure (number of months).

Here's a breakdown of how the code works:

Key Points:

Endpoint:
- /emi-calc-endpoint: Expects a POST request with data in JSON format.
- The data should include three key parameters: amount (loan principal), interest (annual interest rate as a percentage), and tenure (loan tenure in months).
Logic:
- The EMI is calculated using the formula: [ EMI = \frac{P \cdot R \cdot (1 + R)^N}{(1 + R)^N - 1} ] Where:
  - (P) = principal loan amount.
  - (R) = monthly interest rate = (annual interest rate / 12 / 100).
  - (N) = loan tenure in months.
Response:
- On success, the response includes:
```
{
  "version": "7.2",
  "data": {
    "emi_result": "₹ {calculated_emi}",
    "rate": "{interest}% pa"
  }
}
```
- On failure (e.g., missing input data or invalid format), it returns an error with a status code of 400 and an error message.

Example Request:

A sample client request to the /emi-calc-endpoint would look like this:

HTTP Request

POST /emi-calc-endpoint HTTP/1.1
Content-Type: application/json
Host: localhost:5000

{
    "values": {
        "amount": 500000,      // Loan amount in currency units
        "interest": 7.5,       // Annual interest rate in percentage
        "tenure": 60           // Tenure in months
    }
}

Example Data in JSON Format:

{
    "values": {
        "amount": 500000,
        "interest": 7.5,
        "tenure": 60
    }
}

Example Response:

If the input is valid, the response returned by the API will look like:

JSON Response

{
  "version": "7.2",
  "data": {
    "emi_result": "₹ 10137.37",
    "rate": "7.5% pa"
  }
}

This means that for a loan amount of ₹500,000 at an annual interest rate of 7.5% over 60 months (5 years), the calculated EMI is ₹10,137.37 per month.

Error Handling:

If invalid data is sent, the response might contain:

Example Error Response:

{
  "error": "could not convert string to float: 'invalid_amount'"
}

This indicates either invalid data or a missing input in the request payload. The HTTP status code in this case would be 400.

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