SQL Injection Defense Guide

Learn SQL injection vulnerabilities and secure coding practices to protect your databases

Security Education Tool - For Defensive Learning

This educational tool demonstrates SQL injection vulnerabilities so developers can understand, identify, and prevent them in their applications. Learn secure coding practices including parameterized queries, input validation, and ORM usage.

For Authorized Security Testing and Education Only

This tool is intended for security professionals, developers, and students learning about web application security. You must only test systems you own or have explicit written authorization to test. Unauthorized access to computer systems is illegal. By using this tool, you agree to our Responsible Use Policy and Disclaimer.

Payload Categories

Authentication Bypass Payloads

Basic OR Bypass
' OR '1'='1

Classic authentication bypass using always-true condition

Comment Bypass
admin'--

Comments out password check, logs in as admin

OR True with Comment
' OR 1=1--

Combines OR with comment to bypass auth

Double Dash Comment
admin'/*

Uses multi-line comment for bypass

Hex Encoded
WAF Bypass
' OR 0x31=0x31--

Uses hex encoding to bypass basic filters

NULL Byte
WAF Bypass
admin'%00

NULL byte termination bypass

Custom Payload Builder

Payload Encoding

URL Encoded
-
Double URL Encoded
-
Hex Encoded
-
Unicode Encoded
-

Prevention Methods

Parameterized Queries
// Safe - using prepared statements
const stmt = db.prepare('SELECT * FROM users WHERE id = ?');
stmt.get(userId);
String Concatenation
// UNSAFE - vulnerable to SQLi
const query = `SELECT * FROM users WHERE id = '${userId}'`;
db.query(query);
ORM/Query Builder
// Safe - using ORM
User.findOne({ where: { id: userId } });
Input Validation
// Additional layer - validate input type
if (!Number.isInteger(parseInt(userId))) {
  throw new Error('Invalid ID');
}

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