Question 1

How to persist sql.js database across page reloads?

Accepted Answer

You need to serialize the database to a binary format and save it to IndexedDB or localStorage, then reload it on startup. sql.js doesn't provide built-in persistence, so this requires custom implementation.

Question 2

sql.js vs IndexedDB: which is better for browser storage?

Accepted Answer

Use sql.js for complex SQL queries and relational data management; IndexedDB is better for simple key-value storage with built-in persistence. sql.js offers more powerful querying but lacks automatic persistence.

Question 3

What browsers support sql.js?

Accepted Answer

sql.js relies on WebAssembly, so it works in modern browsers like Chrome, Firefox, Safari, and Edge that support WebAssembly. Older browsers without WebAssembly support will not work.

Question 4

How to import an existing SQLite .db file into sql.js?

Accepted Answer

Load the .db file as an ArrayBuffer using FileReader or fetch, then use sql.js's API to open it. This allows seamless migration from server-side SQLite databases to the browser.

Question 5

Can sql.js handle large datasets without crashing?

Accepted Answer

It depends on browser memory limits; for very large datasets, you might need to chunk data or optimize queries. sql.js can process large data but may cause memory issues if not managed carefully.

Question 6

Is sql.js production-ready for enterprise applications?

Accepted Answer

Yes, it's stable and used in production for data-intensive apps, but ensure you handle persistence, memory, and error recovery to avoid data loss or performance bottlenecks.

sql.js

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