SQL Parameter Binding Previewer
Fill placeholders (?, :id, @username) in a SQL query with escaped parameter values
Paste a SQL query that uses positional (?) or named (:id, @username) placeholders, supply your parameter values, and see the fully bound statement with quotes properly escaped — exactly what you'd want when reading a log line or debugging a query by hand.
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How to use
- Select your database: MySQL, PostgreSQL, or SQLite.
- Choose how you want to enter parameters — ordered list, key=value pairs, or JSON — and fill in the values.
- Paste the original SQL statement containing the placeholders into the input box.
- Read the final query with escaping applied in the results panel below, then copy it.
FAQ
- Will a ? inside a string literal get replaced too?
- No. A character-by-character tokenizer skips over string literals ('...'), line comments (--), and block comments (/* */), so those characters are left untouched and your query stays intact.
- Does this protect against SQL injection?
- No — this is a text-level binding previewer, nothing more. In production code you should always use prepared statements and your database driver's native parameter binding, both for security and for performance.
- Can I bind an array value into an IN clause parameter?
- Yes — in JSON input mode, if you supply an array as the value, the tool automatically expands it into IN (?, ?, ?) with one placeholder per element, escaping each value individually. Just keep in mind that in your actual server code, you'll still need to confirm your database driver supports array binding that way.