SQL Injection Vulnerability Pattern Scanner

Scan your own code for SQL injection vulnerable patterns free online. Detects unsafe string concatenation in queries before they reach production. Code review, not an attack tool.

Paste your code to scan for SQL injection patterns

How to Use This Tool

Paste your codeAdd the source code that builds and runs SQL queries

Click Scan for Vulnerable PatternsText is checked for string concatenation into queries

Fix flagged linesReplace concatenation with parameterized queries

Catching SQL Injection Before It Ships, Not Testing It Against Live Systems

SQL injection remains one of the most consistently dangerous and well-documented web vulnerabilities, decades after it was first identified. The actual underlying mistake is almost always the same: building a SQL query by directly concatenating untrusted input into the query text, rather than passing that input as a separate, properly typed parameter that the database driver handles safely regardless of its content.

This tool scans pasted source code -- yours, during a code review -- for the textual patterns that indicate this concatenation mistake, across the syntax conventions of several common languages. It performs no live testing against any database or website; it only reads the text you provide.

The Fix Is Almost Always Parameterized Queries

Every mainstream database driver and ORM supports parameterized queries (prepared statements with placeholders), and switching from string concatenation to this pattern closes the vulnerability category entirely for that query, regardless of what characters an attacker tries to inject -- the database driver guarantees the parameter is treated strictly as data, never as executable query syntax.

Why This Tool Deliberately Stops at Static Scanning

A tool that actually sends crafted injection payloads against live database-backed endpoints is an attack tool by function, regardless of how it's framed, and could be misused against systems the person running it has no authorization to test. Scanning pasted source code for vulnerable patterns serves the same defensive goal -- finding problems before they reach production -- without that risk, which is why this tool is built this way deliberately.

Frequently Asked Questions

No. This is a static code review tool -- you paste your own source code, and it scans the text for patterns known to indicate SQL injection vulnerabilities, like string concatenation building a query. It never connects to any database or sends any request to any server. It is a defensive code review aid, not an attack tool.

The core problem is building a SQL query by directly concatenating untrusted input into the query string, like 'SELECT * FROM users WHERE name = "' + userInput + '"'. If userInput contains SQL syntax, it gets interpreted as part of the query rather than as a literal value, letting an attacker manipulate the query's logic.

Parameterized queries (also called prepared statements). Instead of building a query string with concatenation, you write the query with placeholders and pass user input as separate parameters -- the database driver handles keeping that input as data, never as executable SQL syntax, regardless of what characters it contains.

No. It flags common textual patterns associated with vulnerable code, which catches a meaningful share of real-world cases, but it cannot understand full program logic or every possible way a query might be constructed indirectly. Treat a clean scan as a useful first pass, not a complete security audit.

A tool that sends crafted SQL injection payloads against live websites is functionally an attack tool regardless of stated intent, and could be used against systems the user doesn't have permission to test. A static code scanner that only reads pasted source text serves the legitimate defensive purpose -- finding your own vulnerable code before it ships -- without that risk.