# SQLite Wasm

SQLite Wasm conveniently wrapped as an ES Module.

## Installation

```bash
npm install @sqlite.org/sqlite-wasm
```

## Bug reports

> [!Warning]
>
> This project wraps the code of [SQLite Wasm](https://sqlite.org/wasm/doc/trunk/index.md) with _no_
> changes, apart from added TypeScript types. Please do _not_ file issues or feature requests
> regarding the underlying SQLite Wasm code here. Instead, please follow the
> [SQLite bug filing instructions](https://www.sqlite.org/src/wiki?name=Bug+Reports). Filing
> TypeScript type related issues and feature requests is fine.

## Node.js support

> [!Warning]
>
> Node.js is currently only supported for in-memory databases without persistence.

## Usage

There are two ways to use SQLite Wasm:

- [in a worker](#in-a-worker-with-opfs-if-available)
- [in the main thread](#in-the-main-thread-without-opfs)

Only the worker versions allow you to use the origin private file system (OPFS) storage back-end.

### In a worker (with OPFS if available):

> [!Warning]
>
> For this to work, you need to set the following headers on your server:
>
> `Cross-Origin-Opener-Policy: same-origin`
>
> `Cross-Origin-Embedder-Policy: require-corp`

```js
// In `main.js`.
const worker = new Worker('worker.js', { type: 'module' });
```

```js
// In `worker.js`.
import sqlite3InitModule from '@sqlite.org/sqlite-wasm';

const start = (sqlite3) => {
  console.log('Running SQLite3 version', sqlite3.version.libVersion);
  const db =
    'opfs' in sqlite3
      ? new sqlite3.oo1.OpfsDb('/mydb.sqlite3')
      : new sqlite3.oo1.DB('/mydb.sqlite3', 'ct');
  console.log(
    'opfs' in sqlite3
      ? `OPFS is available, created persisted database at ${db.filename}`
      : `OPFS is not available, created transient database ${db.filename}`,
  );
  // Your SQLite code here.
};

const initializeSQLite = async () => {
  try {
    console.log('Loading and initializing SQLite3 module...');
    const sqlite3 = await sqlite3InitModule();
    console.log('Done initializing. Running demo...');
    start(sqlite3);
  } catch (err) {
    console.error('Initialization error:', err.name, err.message);
  }
};

initializeSQLite();
```

The `db` object above implements the
[Object-Oriented API #1](https://sqlite.org/wasm/doc/trunk/api-oo1.md).

### In the main thread (without OPFS):

```js
import sqlite3InitModule from '@sqlite.org/sqlite-wasm';

const start = (sqlite3) => {
  log('Running SQLite3 version', sqlite3.version.libVersion);
  const db = new sqlite3.oo1.DB('/mydb.sqlite3', 'ct');
  // Your SQLite code here.
};
const initializeSQLite = async () => {
  try {
    console.log('Loading and initializing SQLite3 module...');
    const sqlite3 = await sqlite3InitModule();
    console.log('Done initializing. Running demo...');
    start(sqlite3);
  } catch (err) {
    console.error('Initialization error:', err.name, err.message);
  }
};

initializeSQLite();
```

The `db` object above implements the
[Object-Oriented API #1](https://sqlite.org/wasm/doc/trunk/api-oo1.md).

## Usage with vite

If you are using [vite](https://vitejs.dev/), you need to add the following config option in
`vite.config.js`:

```js
import { defineConfig } from 'vite';

export default defineConfig({
  server: {
    headers: {
      'Cross-Origin-Opener-Policy': 'same-origin',
      'Cross-Origin-Embedder-Policy': 'require-corp',
    },
  },
  optimizeDeps: {
    exclude: ['@sqlite.org/sqlite-wasm'],
  },
});
```

Check out a [sample project](https://stackblitz.com/edit/vitejs-vite-ttrbwh?file=main.js) that shows
this in action.

## Demo

See the [demo](https://github.com/sqlite/sqlite-wasm/tree/main/demo) folder for examples of how to
use this in the main thread and in a worker. (Note that the worker variant requires special HTTP
headers, so it can't be hosted on GitHub Pages.) An example that shows how to use this with vite is
available on [StackBlitz](https://stackblitz.com/edit/vitejs-vite-ttrbwh?file=main.js).

## Projects using this package

See the list of [npm dependents](https://www.npmjs.com/browse/depended/@sqlite.org/sqlite-wasm) for
this package.

## Deploying a new version

(These steps can only be executed by maintainers.)

1. Manually trigger the [GitHub Actions workflow](../../actions/workflows/build-wasm.yml). By
   default, it uses the latest SQLite tag. This pull request will contain the latest `sqlite3.wasm`
   and related bindings.

2. Once the above pull request is validated and merged, update the version number in `package.json`,
   reflecting the current [SQLite version number](https://sqlite.org/download.html) and add a build
   identifier suffix like `-build1`. The complete version number should read something like
   `3.41.2-build1`.

## Building the SQLite Wasm locally

1. Build the Docker image:

   ```bash
   docker build -t sqlite-wasm-builder:env .
   ```

2. Run the build:

   **Unix (Linux/macOS):**

   ```bash
   docker run --rm \
     -e SQLITE_REF="master" \
     -v "$(pwd)/out":/out \
     -v "$(pwd)/src/bin":/src/bin \
     sqlite-wasm-builder:env build
   ```

   **Windows (PowerShell):**

   ```powershell
   docker run --rm `
     -e SQLITE_REF="master" `
     -v "${PWD}/out:/out" `
     -v "${PWD}/src/bin:/src/bin" `
     sqlite-wasm-builder:env build
   ```

   **Windows (Command Prompt):**

   ```cmd
   docker run --rm ^
     -e SQLITE_REF="master" ^
     -v "%cd%/out:/out" ^
     -v "%cd%/src/bin:/src/bin" ^
     sqlite-wasm-builder:env build
   ```

## Running tests

The test suite consists of Node.js tests and browser-based tests (using Vitest Browser Mode). Tests
aim to sanity-check the exported scripts. We test for correct exports and **very** basic
functionality.

1. Install dependencies:

   ```bash
   npm install
   ```

2. Install Playwright browsers (required for browser tests):

   ```bash
   npx playwright install chromium --with-deps --no-shell
   ```

3. Run all tests:

   ```bash
   npm test
   ```

## Deprecations

The Worker1 and Promiser1 APIs are, as of 2026-04-15, deprecated. They _will not be removed_, but
they also will not be extended further. It is their author's considered opinion that they are too
fragile, too imperformant, and too limited for any non-toy software, and their use is _actively
discouraged_. The "correct" way to use this library is documented in [Usage](#usage) section above.

## License

Apache 2.0.

## Acknowledgements

This project is based on [SQLite Wasm](https://sqlite.org/wasm), which it conveniently wraps as an
ES Module and publishes to npm as
[`@sqlite.org/sqlite-wasm`](https://www.npmjs.com/package/@sqlite.org/sqlite-wasm).