README.md

SQLite Wasm

SQLite Wasm conveniently wrapped as an ES Module.

Warning

This project wraps the code of SQLite Wasm 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. Filing TypeScript type related issues and feature requests is fine.

Installation

npm install @sqlite.org/sqlite-wasm

Usage

There are three ways to use SQLite Wasm:

• in the main thread with a wrapped worker (🏆 preferred option)
• in a worker
• in the main thread

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

In a wrapped 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

import { sqlite3Worker1Promiser } from '@sqlite.org/sqlite-wasm';

const log = (...args) => console.log(...args);
const error = (...args) => console.error(...args);

(async () => {
  try {
    log('Loading and initializing SQLite3 module...');

    const promiser = await new Promise((resolve) => {
      const _promiser = sqlite3Worker1Promiser({
        onready: () => {
          resolve(_promiser);
        },
      });
    });

    log('Done initializing. Running demo...');

    let response;

    response = await promiser('config-get', {});
    log('Running SQLite3 version', response.result.version.libVersion);

    response = await promiser('open', {
      filename: 'file:mydb.sqlite3?vfs=opfs',
    });
    const { dbId } = response;
    log(
      'OPFS is available, created persisted database at',
      response.result.filename.replace(/^file:(.*?)\?vfs=opfs$/, '$1'),
    );
    // Your SQLite code here.
  } catch (err) {
    if (!(err instanceof Error)) {
      err = new Error(err.result.message);
    }
    error(err.name, err.message);
  }
})();

The promiser object above implements the Worker1 API.

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

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

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

const log = (...args) => console.log(...args);
const error = (...args) => console.error(...args);

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

log('Loading and initializing SQLite3 module...');
sqlite3InitModule({
  print: log,
  printErr: error,
}).then((sqlite3) => {
  log('Done initializing. Running demo...');
  try {
    start(sqlite3);
  } catch (err) {
    error(err.name, err.message);
  }
});

The db object above implements the Object Oriented API #1.

In the main thread (without OPFS):

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

const log = (...args) => console.log(...args);
const error = (...args) => console.error(...args);

const start = function (sqlite3) {
  log('Running SQLite3 version', sqlite3.version.libVersion);
  const db = new sqlite3.oo1.DB('/mydb.sqlite3', 'ct');
  // Your SQLite code here.
};

log('Loading and initializing SQLite3 module...');
sqlite3InitModule({
  print: log,
  printErr: error,
}).then((sqlite3) => {
  try {
    log('Done initializing. Running demo...');
    start(sqlite3);
  } catch (err) {
    error(err.name, err.message);
  }
});

The db object above implements the Object Oriented API #1.

Usage with vite

If you are using vite, you need to add the following config option in vite.config.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 that shows this in action.

Demo

See the 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.

Projects using this package

See the list of npm dependents for this package.

Deploying a new version

(These steps can only be executed by maintainers.)

1. Update the version number in package.json reflecting the current SQLite version number and add a build identifier suffix like -build1. The complete version number should read something like 3.41.2-build1.
2. Run npm run build to build the ES Module. This downloads the latest SQLite Wasm binary and builds the ES Module.
3. Run npm run deploy to commit the changes, push to GitHub, and publish the new version to npm.

License

Apache 2.0.

Acknowledgements

This project is based on SQLite Wasm, which it conveniently wraps as an ES Module and publishes to npm as @sqlite.org/sqlite-wasm.