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SQL Injection | SQL & Databases Tutorial

Learn about SQL Injection in this comprehensive SQL & Databases development tutorial. The deadliest vulnerability.

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01Never concatenate inputs

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If you build an insert string in Node like this: `"INSERT INTO users (name) VALUES ('" + req.body.name + "')"`, you have created a SQL Injection vulnerability. If a user types `'); DROP TABLE users; --` as their name, the database will execute it and delete your table. ALWAYS use Parameterized Queries (e.g., `VALUES ($1)`).

If you build an insert string in Node like this: "INSERT INTO users (name) VALUES ('" + req.body.name + "')", you have created a SQL Injection vulnerability. If a user types '); DROP TABLE users; -- as their name, the database will execute it and delete your table. ALWAYS use Parameterized Queries (e.g., VALUES ($1)).