SQL Injection Pattern Checker

SQL injection (SQLi) is the #1 web security vulnerability (OWASP Top 10). It occurs when user-supplied input is inserted directly into a SQL query without proper sanitization. An attacker can manipulate the query to bypass authentication (OR 1=1), extract all database records (UNION SELECT), delete data (DROP TABLE), or even execute OS commands on the database server. A single vulnerable input field can compromise an entire database.

A parameterized query (also called a prepared statement) separates the SQL code from the data. Instead of building a string like 'SELECT * FROM users WHERE id=' + userId, you write 'SELECT * FROM users WHERE id = ?' and pass userId as a separate parameter. The database driver handles escaping and quoting, making it structurally impossible for the data to be interpreted as SQL code. This is the gold standard defense.

This tool checks for common injection patterns: UNION SELECT attacks (data extraction), Boolean-based blind injection (OR 1=1, AND 1=2), comment injection (-- , #, /**/), stacked queries (semicolons), tautologies and always-true conditions, common SQLi function calls (SLEEP, BENCHMARK, WAITFOR, LOAD_FILE, INTO OUTFILE), and encoded/obfuscated variants. It's educational and not a replacement for a full security scanner.

No. This tool only analyzes the text you paste — it detects SQL injection patterns in the string itself. No network requests are made, no database is connected. It's a learning and code review aid to spot suspicious patterns in query strings or user input values before they reach your database layer.

First-order injection happens immediately — the malicious input is used in a query right away. Second-order (or stored) injection is more subtle: the malicious input is stored in the database safely, but then later retrieved and used unsanitized in a different query. Second-order injection is why you should always use parameterized queries when reading data back out of the database, not just when writing.

Modern ORMs (Sequelize, Prisma, SQLAlchemy, ActiveRecord) use parameterized queries by default, making them safe for standard operations. However, they become vulnerable when you use raw query escape hatches: Sequelize.literal(), cursor.execute(f'... {val}'), or .where('column = ' + val). Always treat raw SQL fragments inside an ORM as a red flag and pass values as bind parameters instead.