Is this tool safe and legal to use?

Yes. It is strictly defensive and educational. It only analyzes the text you paste and explains the risks -- it never connects to, scans, or runs anything against a database. A prominent disclaimer notes that you should never use these techniques against systems you do not own or have explicit permission to test.

What is the difference between Analyze and Reference mode?

Analyze mode takes a query or code snippet and produces a severity-graded risk report with findings, a score out of 100, and a parameterized secure rewrite. Reference mode is a learning catalog: it lists the major injection classes -- tautology / auth bypass, UNION-based, error-based, boolean-blind, time-blind, stacked queries, and second-order -- and for each shows a representative example, why it works, and the concrete defense.

What construction issues does Analyze mode detect?

It checks for string concatenation and interpolation (+ quotes, ${...}, f-strings, %s, .format()), an odd number of single or double quotes, comment sequences, OR 1=1 patterns, UNION SELECT, time-based functions like SLEEP and WAITFOR DELAY, multiple statements separated by semicolons, hex encoding, dynamic table or column names, and whether any validation, escaping, or parameter placeholders are present.

How is the risk score computed?

Each detected vulnerability adds a weight to the score -- 30 for critical, 20 for high, 10 for medium, and 5 for low -- and the total is capped at 100. The summary cards count findings per severity, and any detection marks the query as at risk. A score of 0 with no findings means no obvious vulnerabilities were detected.

Why does my safe query still get flagged?

The "Missing Input Validation" check looks for evidence of validation, escaping, or placeholders such as ? or $1. A parameterized query that uses placeholders will satisfy it, but a plain SELECT with no parameters and no validation keywords can still be flagged as a reminder to parameterize. The checks are heuristic, so always review findings in context.

How do I actually prevent SQL injection?

Use parameterized queries or prepared statements so user input is bound as a value and can never change the query structure -- this stops the vast majority of injection. Add allowlist validation for any dynamic identifiers (table or column names), run the database under a least-privilege account, and prefer a well-maintained ORM such as Prisma, SQLAlchemy, or TypeORM that parameterizes by default. The Analyze mode generates a parameterized rewrite for node (mysql2), Python (sqlite3), and TypeScript (Prisma) you can copy.

SQL Injection Tester

A defensive, educational SQL injection tester. Analyze a query or code snippet for injection risk — get a severity-graded report and a parameterized secure rewrite — or browse a categorized reference of injection classes (tautology, UNION, error-based, blind, stacked) with the concrete defense for each. Runs entirely in your browser and never touches a real database.

About this ToolHow it works, benefits & use cases

This is a defensive, educational SQL injection tester with two modes. In Analyze mode it inspects a SQL query or a snippet of application code and reports the injection weaknesses it finds, then shows you how to rewrite it safely. It looks at how queries are constructed: it flags string concatenation and template interpolation (+ "...", ${...}, f-strings, %s, .format()), unbalanced quotes, comment sequences, OR 1=1 patterns, UNION SELECT, time-based blind techniques (SLEEP, WAITFOR DELAY, BENCHMARK, pg_sleep), stacked queries, hex encoding, dynamic table or column names, and the absence of any validation or placeholders. Each finding carries a severity and an example attack, and the whole query gets a weighted risk score out of 100 with severity-graded summary cards and an overall verdict. In Reference mode it presents a categorized catalog of the major injection classes -- tautology / authentication bypass, UNION-based, error-based, boolean-blind, time-blind, stacked queries, and second-order -- and for each one explains what it is, shows a representative example, says why it works, and gives the concrete defense. It is strictly for defensive and educational use, runs entirely in your browser, and never connects to a database.

How to Use

1Stay in Analyze mode to test a query, or switch to Reference to browse the injection-class catalog.
2In Analyze mode, click an example (Classic OR Injection, Comment-based, UNION-based, Stacked Queries, Time-based Blind, or Boolean-based Blind) to load a sample, or paste your own query or code.
3Press "Test for Vulnerabilities" to run the construction-focused checks.
4Read the verdict banner, the risk score out of 100, and the severity-graded summary cards, then review each finding for its severity and example attack.
5Apply the Remediation guidance and copy the secure parameterized rewrite from the output panel.
6In Reference mode, filter by category and read the why-it-works / defense pair for each injection class.

Key Benefits

Two modes: a query risk analyzer and a categorized defensive reference
Analyzes query construction (concatenation, interpolation) -- not just payloads
Detects unbalanced quotes, comments, OR 1=1, UNION, stacked, and time-based patterns
Severity-graded summary cards plus a weighted 0-100 risk score and clear verdict
Each finding lists severity and a concrete example attack
Generates a parameterized secure rewrite you can copy
Reference catalog pairs each injection class with its concrete defense
Defensive and educational, fully in-browser -- nothing is uploaded and no database is touched

Common Use Cases

Reviewing a query-building function during a security-focused code review
Checking whether legacy code concatenates user input into SQL
Generating a safe parameterized rewrite to replace a flagged query
Teaching the difference between safe placeholders and string interpolation
Learning the major injection classes and how to defend against each
Quickly triaging a query pasted from a pull request before merging

For educational and defensive use only. This tool analyzes text you paste to teach you how injection works and how to prevent it. It never connects to or runs anything against a database. Do not use these techniques against systems you do not own or have explicit permission to test.

SQL query or code snippet

Paste the query or the code that builds it. Concatenation and interpolation are exactly what we look for.

Load example:

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SQL Injection Tester

How to Use

Key Benefits

Common Use Cases

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