// security check

SQL injection scanner for beginners

Short answer

SQL injection happens when user input gets pasted directly into a database query, letting an attacker rewrite that query to read, change, or delete your data. If your app builds queries by string-concatenation instead of parameterized queries, it's likely vulnerable. CodeCheck safely tests your live endpoints and shows you where.

Check my app — free

A SQL injection scanner checks whether attackers can smuggle commands into your database through ordinary form fields and URLs. It remains one of the most damaging web vulnerabilities because a single injectable field can expose your entire database.

You don't need a security background to understand the risk. If your code ever glues user input into a query string — the pattern AI tools reach for when you ask them to "filter by name" — that input can break out and run its own SQL.

The vulnerable pattern (and the safe one)

Injection comes from building queries by concatenation. The fix is parameterized queries, where the database treats input strictly as data, never as code:

Vulnerable vs. safe

// VULNERABLE — input becomes part of the query
db.query("SELECT * FROM users WHERE email = '" + email + "'");

// SAFE — input is a parameter, never executed as SQL
db.query("SELECT * FROM users WHERE email = $1", [email]);

How CodeCheck tests it safely

CodeCheck sends benign, non-destructive probes to your parameterized endpoints and watches how the app responds — error signatures, boolean differences, and (only in opt-in active mode on verified domains) timing tests. It never runs DROP or destructive payloads.

How to protect your app

A few habits close almost every injection hole:

Always use parameterized queries or a query builder / ORM — never string concatenation.
If you use Supabase or Firebase client libraries, you get parameterization for free; the risk is in custom API routes.
Validate and constrain input types (a numeric id should be a number).
Return generic error messages so responses don't leak database structure.

Frequently asked questions

How do I test my website for SQL injection?

The safe way is an automated scanner that sends non-destructive probes and analyzes the responses. CodeCheck does this against your live endpoints without running any destructive queries, and reports which inputs are injectable and how to fix them. Manual testing risks damaging your own data.

Can vibe-coded apps get SQL injection?

Yes. If your app has custom API routes that build database queries from user input by concatenation, it can be injectable regardless of how it was written. Apps that use only Supabase/Firebase client libraries are usually safe from injection because those libraries parameterize queries for you.

Will scanning for SQL injection break my database?

Not with CodeCheck's standard scan — it only sends read-only, non-destructive probes. Tests that could touch state are opt-in, require you to verify domain ownership, and are still bounded and non-destructive.

See exactly what's exposed — in about a minute.

Paste your link. CodeCheck checks your live app the way a hacker would and hands you the fix in plain English. Free to start, no card.