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SQL Validator and Syntax Checker

Validate and format your SQL queries instantly supporting JOINs, CTEs, and complex statements.

Made with ❤️ for devs, the StrongDM way: fast, simple, secure.

How to Use This Tool

1. Enter Your SQL Query: Paste or type any SQL query into the input box—supports SELECT, JOIN, CTE, INSERT, and more.

2. Validate: Click “Validate SQL” to check your query for syntax errors using a live SQLite engine.

3. Generate a Sample: Need inspiration? Click “Generate Sample” to auto-fill a complex, realistic SQL query.

4. Format Your SQL: Click “Format SQL” to clean up and prettify your query with consistent indentation and spacing.

5. View the Query Plan: Click “EXPLAIN Plan” to see how the database would process your query, helpful for optimization.

6. Reset the Tool: Click “Reset” to clear the editor and start from scratch.

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SQL Validator and Syntax Checker: FAQ

This tool helps you check SQL query syntax in real time. It’s ideal for developers, analysts, and database admins who want to ensure queries are error-free before running them in production.
It supports most common SQL constructs like SELECT, JOIN, INSERT, UPDATE, DELETE, GROUP BY, ORDER BY, and WITH (CTEs). The tool is backed by an in-browser SQLite engine, so syntax must be valid within SQLite’s dialect.
No. Everything runs entirely in your browser using WebAssembly. Your queries are never sent to a server or stored anywhere.
Yes, as long as those table names match the built-in sample schema (like employees, departments, orders, etc.). The tool is designed to simulate real query scenarios using pre-defined tables.

You’ll get a “no such table” error. This isn’t a syntax issue—it just means the tool doesn’t know about the table. You can only validate against the in-memory schema.

It uses SQLite’s EXPLAIN QUERY PLAN to show how the database engine would interpret and execute your query. It’s helpful for understanding performance implications.
Yes, for syntax validation and learning purposes. But remember: it doesn't check permissions, indexes, or runtime data. Always test critical queries in your staging environment first.
Absolutely not. All processing happens locally. Your queries are private and never leave your device.
Not yet—but we're working on a version that lets you define your own schema directly in the tool for even deeper validation.

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