SQL Injection Escaper & Sanitizer
A free online database security sanitization assistant. Instantly escape dangerous syntax control characters (such as single quotes, double quotes, hyphens, and semicolons) to secure SQL query parameters and demonstrate input sanitization principles. Compare raw template queries with secured SQL output strings. Deeply educational and helpful for preventing XSS and SQL injection vulnerabilities.
Query Variables Input
Use {email} and {password} as placeholder variables.
Try classic SQLi payloads like: secret' OR '1'='1 or admin' --
Vulnerable vs Sanitized Execution
SELECT * FROM users WHERE email = 'admin@builtitdev.com' AND password = 'secret' OR '1'='1';
Notice how the input quotes completed the string segment and allowed inject commands like OR '1'='1 to be analyzed as actual SQL logic, bypassing auth loops completely!
SELECT * FROM users WHERE email = 'admin@builtitdev.com' AND password = 'secret\' OR \'1\'=\'1';
By escaping control characters, quotes are treated as literal text values inside the database engine, stopping the query interpreter from executing them as separate instructions.
Dangerous SQL Injection Characters
| Target | Escaped | Reasoning & Security Impact |
|---|---|---|
| ' | \' | Terminates string literals in SQL commands (classic entry point for SQLi). |
| " | \" | Terminates double-quoted string literals in databases like MySQL. |
| ; | \; | SQL statement terminator. Prevents attackers from chaining malicious queries (e.g. SELECT followed by DROP TABLE). |
| -- | \-\- | SQL comment prefix. Escaping it prevents attackers from commenting out the remainder of the query (e.g. skipping password checks). |
| /* | \/\* | Block comment opener. Used by attackers to bypass filters or disable query fragments. |
| # | \# | Inline comment in MySQL. Escaped to prevent skipping the rest of the statement. |
Industry Standard: Parameterized Queries
// Secure Parameterized Query (Node.js pg-pool / mysql2 example)
const query = 'SELECT * FROM users WHERE email = $1 AND password = $2;';
const values = [email, password]; // Parameters are sent separately from statement
db.query(query, values, (err, res) => { ... });When using prepared statements, the driver sends the query template with placeholders (e.g. $1, ?) first, telling the SQL database what instructions to run.
The user-supplied values are sent in a separate network packet afterwards, preventing any injected characters from ever altering the parsed compilation tree.
Related Security Tools
Password Generator
Generate strong, random passwords with custom rules.
Password Strength Checker
Analyse password entropy, crack time and strength score instantly.
Text Encryptor / Decryptor
Encrypt and decrypt text with AES-256-GCM in your browser.