Querylapse

Querylapse

Tables

This tool is designed for a laptop or desktop screen. It works here, but the tables will be cramped.

See what SQL actually does.

Write a query, press Run, and watch SQLite build the answer one clause at a time. Guess before each step — that is how it sticks.

MESSAGE

Ready.

Write a query above and press Run.

Things to notice

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Querylapse

Starting SQLite in your browser…

Keyboard shortcuts

Ctrl/⌘ + Enter: Run the query
→ or Space: Next step
←: Previous step
Shift + → / ←: Jump a whole clause
Home: Back to the start
Tab in the editor: Insert two spaces
?: This panel
Esc: Close menus

Tip: click a segment of the progress bar to jump straight to that clause.

SQLite engine not found

This app runs SQLite inside your browser using sql.js, which ships as two files. Put them in the vendor/ folder next to index.html:

vendor/sql-wasm.js
vendor/sql-wasm.wasm

Get them from the sql.js releases (inside dist/), or from the npm package (npm pack sql.js).

Alternatively, for development, run node server.mjs and open the address it prints — it uses Node's built-in SQLite instead.

Also note: browsers block Web Workers on file:// pages. Serve the folder with any static server, e.g. python3 serve.py.