Please help urgent

I am new to voiceflow and im following a tutorial , i am basing my test off a real cleaning company and im making a feature where the ai can collect information adn send it to a crm for "staff" to confirm a price , however i am getting a problem when testing , even if i dont put in a valid number , the ai continues its questions , ive tried everything to try fix this with fallbacks , conidtions , etc but nothing has worked it wither always falls back or always goes forward not matter what the user actually says , currently i have it back to where the oringal problem laid so i dont get confused , so there is only one lien of script in the javascript codeblock that says bedroom_number = Number(bedroom_number) , and default goes to next question , fail goes to last utterance , again tho ill say this only makes it so whatever the user says it goes forward none the less , urgentr help please anyone

SSalvation I am new to voiceflow and im following a tutorial , i am basing my test off a re...

Tico | Voiceflow Assistant•11/30/25, 9:22 PM

I can help you fix the number validation issue! The problem is that your current setup only converts the input to a number but doesn't actually validate whether it's a valid number before proceeding.

The Issue

When you use bedroom_number = Number(bedroom_number)bedroom_number = Number(bedroom_number), JavaScript will convert invalid inputs (like "abc") to NaNNaN (Not a Number), but your condition step doesn't check for this. The flow continues regardless because the conversion always "succeeds" technically.

Solution: Proper Number Validation

Here's how to fix it using a Code Step followed by a Condition Step:

Code Step - Validate the Input

// Assumes bedroom_number variable already exists from user input
bedroom_number = bedroom_number.trim();

// Convert to number
var bedroom_num = Number(bedroom_number);

// Check if it's a valid number and positive
if (isNaN(bedroom_num) || bedroom_num <= 0 || !Number.isInteger(bedroom_num)) {
  is_valid_bedroom = false;
} else {
  is_valid_bedroom = true;
  bedroom_number = bedroom_num;
}

// Assumes bedroom_number variable already exists from user input
bedroom_number = bedroom_number.trim();

// Convert to number
var bedroom_num = Number(bedroom_number);

// Check if it's a valid number and positive
if (isNaN(bedroom_num) || bedroom_num <= 0 || !Number.isInteger(bedroom_num)) {
  is_valid_bedroom = false;
} else {
  is_valid_bedroom = true;
  bedroom_number = bedroom_num;
}

Important: Create the is_valid_bedroomis_valid_bedroom variable in Voiceflow before this code step (set it to

false

false

initially).

Condition Step - Route Based on Validation

After the code step, add a Condition Step:

If is_valid_bedroomis_valid_bedroom equals
```
true
```
```
true
```
â Continue to next question
Else â Go back to ask for bedroom number again (fallback)

## Alternative: Use Capture Step with Rules

For a simpler approach, use the Capture Step with built-in validation:

Add a Capture Step
Create a custom entity for bedroom_numberbedroom_number
In the Rules field, add: "The bedroom number must be a positive whole number between 1 and 20""The bedroom number must be a positive whole number between 1 and 20"
Enable Automatically Reprompt so it asks again if validation fails

This approach handles validation automatically without needing code!

Key Points

Number()Number() converts anything, even invalid inputs (returns NaNNaN)

Tico | Voiceflow Assistant•11/30/25, 9:22 PM

Always check with isNaN()isNaN() to verify it's actually a number
Use Number.isInteger()Number.isInteger() if you need whole numbers only
Create validation variables before using them in code steps

Resources:

Try the code validation approach above, and let me know if you need help implementing it!

Voiceflow

JavaScript step

Run custom JavaScript to manipulate variables or control logic.

Voiceflow

Condition step

Creating Conditional Paths
In conversational AI design, controlling the flow and logic of interactions is crucial for delivering effective user experiences. Conditions allow you to add flexibility and dynamic decision-making to your conversation flows using "if-then" logic, allowing you to branch thâ¦

Voiceflow

Capture step

âï¸This feature is part of the old way to build using Voiceflow.Although this feature remains available, we recommend using the Agent step and Tool step to build modern AI agents. Legacy features, such as the Capture step and Intents often consume more credits and lead to a worse user experience.
Intâ¦

TTico | Voiceflow Assistant - Always check with `isNaN()` to verify it's actually a number - Use `Number.isI...

SalvationOP•11/30/25, 9:24 PM

where do i create the is_valid_bedroom variable?