Mike Zupperlearn

Branch from DuckDB, course 1 of 3

SQL in the Browser: DuckDB WASM from Scratch

Put a real SQL engine in a browser tab. Build the data layer of an analytics app on DuckDB compiled to WebAssembly — a worker, a database file that survives reloads, prepared statements, window functions, and a SQL console you write yourself. Free and text-first.

Level
intermediate
Lessons
9
Price
Free

Stops on this branch

9 lessons, about 8 hours.

From DuckDB, Aug 15, 2026

  1. 1A SQL Engine in a Browser Tab45 min
  2. 2Move the Database Off the Main Thread50 min
  3. 3A Table and Twenty Thousand Rows45 min
  4. 4Persistence and the Reload That Costs Nothing50 min
  5. 5Prepared Statements and the IN Clause50 min
  6. 6Pagination That Stays Constant55 min
  7. 7Aggregates and Window Functions55 min
  8. 8PIVOT, and Where Parameters Stop Working45 min
  9. 9A Query Surface of Your Own60 min

Terminus A 34 MB wasm SQL engine, about 7.7 MB gzipped, in a browser tab.

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