SQL Injection Tester

Educational tool to understand SQL injection attacks and learn how to prevent them with parameterized queries

All processing happens in your browser. No data is uploaded.

Offline Ready

SQL Injection Tester

Educational tool to understand SQL injection attacks and learn how to prevent them with parameterized queries

🔒All processing happens in your browser. No data is uploaded.

Educational Tool

This tool is for educational and defensive security purposes only. It demonstrates how SQL injection works and how to write safe parameterized queries. Never use these techniques against systems you do not own.

Query Template

SELECT (Login)

User Input (Simulated)

Enter simulated user input to see how it affects the SQL query...

Common SQL Injection Payloads

Vulnerable Query (String Concatenation)

UNSAFE - Do not use in production

SELECT * FROM users WHERE username = 'user_input_here' AND password = 'pass123'

Safe Parameterized Alternatives

Node.js (mysql2)

const [rows] = await connection.execute(
  'SELECT * FROM users WHERE username = ? AND password = ?',
  [username, password]
);

Python (psycopg2)

cursor.execute(
    "SELECT * FROM users WHERE username = %s AND password = %s",
    (username, password)
)

Java (PreparedStatement)

PreparedStatement ps = conn.prepareStatement(
    "SELECT * FROM users WHERE username = ? AND password = ?"
);
ps.setString(1, username);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();

C# (SqlParameter)

using var cmd = new SqlCommand(
    "SELECT * FROM users WHERE username = @user AND password = @pass",
    connection
);
cmd.Parameters.AddWithValue("@user", username);
cmd.Parameters.AddWithValue("@pass", password);

PHP (PDO)

$stmt = $pdo->prepare(
    'SELECT * FROM users WHERE username = :user AND password = :pass'
);
$stmt->execute(['user' => $username, 'pass' => $password]);

SQL Injection Prevention Best Practices

Always use parameterized queries (prepared statements) instead of string concatenation for SQL.

Use an ORM (Sequelize, SQLAlchemy, Entity Framework) which generates parameterized queries automatically.

Apply the principle of least privilege: database accounts should have only the permissions they need.

Use allowlists for dynamic identifiers like column names and table names that cannot be parameterized.

Implement input validation as a defense-in-depth measure, but never rely on it as the sole protection.

Enable WAF (Web Application Firewall) rules and monitor logs for SQL injection attempt patterns.