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Explanation

Flask allows applications to handle exceptions globally instead of returning unstructured error pages.

Code:

@app.errorhandler(404)
def not_found(error):
    return {'error': 'Resource not found'}, 404

Explanation

Custom error handlers can return consistent JSON responses for REST APIs.

Code:

@app.errorhandler(500)
def server_error(error):
    return {
        'error': 'Internal server error'
    }, 500

Explanation

abort() can stop request processing and return a specific HTTP error status.

Code:

from flask import abort

@app.get('/users/<int:id>')
def get_user(id):
    if id != 101:
        abort(404)
    return {'id': id}

Explanation

Application code can catch known exceptions and return meaningful error responses.

Code:

@app.route('/divide')
def divide():
    try:
        result = 10 / 0
        return {'result': result}
    except ZeroDivisionError:
        return {'error': 'Cannot divide by zero'}, 400

Explanation

A consistent error format makes it easier for frontend applications to process API errors.

Code:

{
  "error": "VALIDATION_ERROR",
  "message": "Email is required",
  "status": 400
}