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HTML

              
                <div id="cbwrap">
  <!-- DOES NOT MATTER -->
  <h1 id="cbtitle">Javascript SQLite</h1>
  <p>Open the console.</p>
</div>
              
            
!

CSS

              
                /* (X) DOES NOT MATTER */
* { box-sizing: border-box; }
body {
  font-family: arial, sans-serif;
  padding: 0; margin: 0; border: 0;
  min-height: 100vh;
  display: flex; justify-content: center; align-items: center;
  background: url(https://images.unsplash.com/photo-1644325349124-d1756b79dd42?crop=entropy&cs=srgb&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2OTQ4NzUzNTZ8&ixlib=rb-4.0.3&q=85);
  background-size: cover;
  background-position: center;
  backdrop-filter: blur(10px);
}
#cbwrap {
  background: rgba(255, 255, 255, 0.9);
  width: 600px; padding: 20px;
  border-radius: 10px;
}
#cbtitle {
  margin-bottom: 40px;
  text-transform: uppercase;
}
#cbinfo {
  padding: 10px; margin-top: 40px;
  font-weight: 700; text-align: center;
}
#cbinfo a {
  text-decoration: none; padding: 5px;
  color: #fff; background: #a91616;
}
              
            
!

JS

              
                var demo = {
  // (A) INITIALIZE
  db     : null,           // database object
  cache  : null,           // storage cache object
  cname  : "SQLDB",        // cache storage name
  dbname : "/demo.sqlite", // database storage name
  init : async () => {
    // (A1) STORAGE CACHE + SQLJS
    demo.cache = await caches.open(demo.cname);
    const SQL = await initSqlJs({
      locateFile: filename => `https://cdnjs.cloudflare.com/ajax/libs/sql.js/1.8.0/${filename}`
    });

    // (A2) ATTEMPT TO LOAD DATABASE FROM STORAGE CACHE
    demo.cache.match(demo.dbname).then(async r => {
      // (A2-1) NOT FOUND - CREATE A NEW DATABASE
      if (r==undefined) {
        demo.db = new SQL.Database();
        demo.db.run(`CREATE TABLE events (
          id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
          date TEXT NOT NULL,
          text TEXT NOT NULL
        )`);
        demo.db.run("CREATE INDEX date ON events (date)");
        await demo.export();
        await demo.run();
        demo.get();
      }

      // (A2-2) LOAD EXISTING DATABASE
      else {
        const buf = await r.arrayBuffer();
        demo.db = new SQL.Database(new Uint8Array(buf));
        demo.get();
      }
    });
  },

  // (B) EXPORT TO CACHE STORAGE
  export : async () => await demo.cache.put(
    demo.dbname, new Response(demo.db.export())
  ),

  // (C) DEMO - INSERT/UPDATE EVENT
  run : async () => {
    // (C1) INSERT
    demo.db.run(
      `INSERT INTO events (date, text) VALUES (?,?), (?,?), (?,?)`, [
      "2077-06-05 00:00:00", "First event.",
      "2077-06-06 00:00:00", "Second event.",
      "2077-06-07 00:00:00", "Third event."
    ]);

    // (C2) UPDATE
    demo.db.run(
      `UPDATE events SET date=?, text=? WHERE id=?`,
      ["2077-06-06 00:00:00", "Second event EDITED.", 2]
    );

    // (C3) DELETE
    demo.db.run("DELETE FROM events WHERE id=?", [1]);

    // (C4) "COMMIT"
    await demo.export();
  },

  // (D) DEMO - GET EVENT
  get : () => {
    // (D1) GET SINGLE ENTRY
    let stmt = demo.db.prepare("SELECT * FROM events WHERE id=$id"),
        res = stmt.getAsObject({$id:2});
    console.log(res);

    // (D2) GET MULTIPLE ENTRIES
    stmt = demo.db.prepare(
      `SELECT * FROM events
       WHERE date BETWEEN $start AND $end`);
    stmt.bind({$start:"2077-06-01 00:00:00", $end:"2077-06-08 00:00:00"})
    while (stmt.step()) { 
      res = stmt.getAsObject();
      console.log(res);
    }
  }
};

// (E) GO!
window.addEventListener("load", demo.init);
              
            
!
999px

Console