A real SQLite database, running in this tab against your browser's origin-private file system. Queries execute locally in a Web Worker — nothing is uploaded, and the data survives a reload.
return is shown alongside — an array of rows becomes a
table, anything else becomes JSON.
Pick an example or write your own query, then press Run query. Rows that share a shape come back as a table; anything else as JSON.
++id, name, age, city, *tags, [name+age]++id, friendId, created
*tags matches any element of the array;
[name+age] is one index over both fields.