mysqljs vs Sequelize
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A pure JavaScript MySQL client for Node.js that talks directly to MySQL servers.
Open source · MIT
A Node.js and TypeScript ORM for working with SQL databases using JavaScript objects.
The short answer
Choose mysqljs if you need…
- Node.js backend developers who need to query a MySQL database
- Teams that want a pure JavaScript driver with no native compilation step
- Projects that already run MySQL and want a widely used Node.js client
Choose Sequelize if you need…
- Node.js backend developers who use a relational SQL database
- TypeScript teams that want typed database models
- Projects that may switch between PostgreSQL, MySQL, SQLite or MSSQL
- Developers who want transactions and relations without writing raw SQL for every query
Side-by-side
| mysqljs | Sequelize | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 18.6k | 30.3k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | JavaScript | TypeScript |
| Last code update | 2 years ago | 5 days ago |
What each one is
mysqljs
This is a Node.js library that lets JavaScript code connect to a MySQL database and run queries. It is written entirely in JavaScript and implements the MySQL wire protocol itself, so it does not depend on a separate native MySQL driver. Developers use it to read and write data from Node.js server applications.
Sequelize
Sequelize is an object-relational mapper (ORM) for Node.js. It lets developers read and write rows in SQL databases such as PostgreSQL, MySQL, MariaDB, SQLite and Microsoft SQL Server through JavaScript or TypeScript code instead of hand-written SQL. The README describes it as promise-based, with transaction support, relations, eager and lazy loading, and read replication.
Best for
mysqljs
- Node.js backend developers who need to query a MySQL database
- Teams that want a pure JavaScript driver with no native compilation step
- Projects that already run MySQL and want a widely used Node.js client
Sequelize
- Node.js backend developers who use a relational SQL database
- TypeScript teams that want typed database models
- Projects that may switch between PostgreSQL, MySQL, SQLite or MSSQL
- Developers who want transactions and relations without writing raw SQL for every query
Strengths
mysqljs
- Pure JavaScript implementation with no native build dependency
- Widely used, with about 18,600 GitHub stars at the time of metadata capture
- Open source under the MIT license
Sequelize
- Supports many SQL databases, including PostgreSQL with JSON and JSONB support
- Written in TypeScript and published under the permissive MIT license
- Has a long history, a large star count and an active contributor community
Not ideal for
mysqljs
- People who are not writing Node.js code, since it is a JavaScript library
- Projects that need a newer, actively promoted driver, because the README was not sufficient to confirm current maintenance status beyond the last push date
- Users of other databases such as PostgreSQL, which need a different client
Sequelize
- Projects that don't use a SQL database, since Sequelize is built for relational databases
- Developers who prefer writing raw SQL and want minimal abstraction
- Teams that need a stable release right now, since the README highlights active work on the next major version and links to a v7 alpha guide
Trade-offs
mysqljs
- The README provided was truncated, so detailed feature and API coverage could not be fully verified here
- No formal release is listed, so users must rely on the repository's current code or package registry versions
- Being a low-level driver, it leaves query building and schema design to the developer
Sequelize
- The README asks for new maintainers and notes that the next major version is still being finalized
- Two major versions are documented (v6 stable, v7 alpha), so users must pick one and follow its guide
- Feature details beyond the README summary are not covered in the text provided
Getting started
Sequelize
Install the core package (from the npm badge link)
npm install @sequelize/coreFrequently asked questions
What is the difference between mysqljs and Sequelize?
mysqljs: A pure JavaScript MySQL client for Node.js that talks directly to MySQL servers. Sequelize: A Node.js and TypeScript ORM for working with SQL databases using JavaScript objects. mysqljs suits node.js backend developers who need to query a mysql database, while Sequelize suits node.js backend developers who use a relational sql database.
Are mysqljs and Sequelize free?
mysqljs: Free and open source. Sequelize: Free and open source.
Is mysqljs or Sequelize more popular?
Sequelize has more GitHub stars (30.3k) than mysqljs (18.6k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to mysqljs and Sequelize?
Other options people compare them with include TypeORM, Kysely, knex.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.