Input Validation vs Webhooks
Both are commonly confused. Here is a side-by-side breakdown of what each one does, when to reach for it, and when it would be the wrong choice.
Input Validation
Validation = checking data is correct (email has @). Sanitization = removing danger (no tags). Use BOTH — validation catches mistakes, sanitization stops attacks.
Read full block →Webhooks
Webhooks = automatic notifications from one app to another when something happens. Like getting a text when your package arrives instead of refreshing the tracking page all day.
Read full block →When to use each
Use Input Validation when
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You accept ANY data from users
Forms, search boxes, API endpoints, file uploads — if a user can type or send something, you need to validate it. Never trust input you didn't create.
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Data will be stored or displayed
Before saving to a database or showing on a page, validate. Bad data in your database causes bugs forever. Bad data on your page can even attack other users (XSS).
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You're building any login or signup flow
Email must be real. Password must meet requirements. Username can't have special characters. These validations protect your users and your system.
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You process payments or sensitive data
Credit card numbers have specific formats. Social security numbers have rules. Validating these fields catches typos before expensive payment failures.
Use Webhooks when
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You need to know when something happens in another app
Customer paid? Order shipped? Pull request merged? Webhooks tell you immediately. Perfect for payment notifications, shipping updates, or syncing data between services.
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You want real-time reactions
Send a welcome email the instant someone signs up. Update inventory the moment an order is placed. Webhooks let you react in real-time, not on a 5-minute delay.
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You're connecting to a third-party service
Stripe, GitHub, Shopify, Twilio: almost every major service supports webhooks. They are the standard way to receive updates from external platforms.
When to avoid each
Avoid Input Validation when
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Data comes from your own code
If you're passing data between functions you wrote, you don't need to validate again. Validation is for untrusted input — external data you can't control.
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You're over-validating
Don't reject valid data with overly strict rules. Not all phone numbers are 10 digits. Not all names use only letters. Validate for safety, not arbitrary formatting.
Avoid Webhooks when
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You only need data once
If you just need to fetch a user's profile one time, use a regular API call. Webhooks are for ongoing notifications, not one-time lookups.
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You control both systems
If you own both the sender and receiver, you might prefer direct function calls, message queues, or database triggers. Webhooks shine when connecting separate services.
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You're building a tiny script
A simple script that runs once doesn't need webhook infrastructure. Keep it simple. Poll if you only need data occasionally.