Helmet is middleware for Express applications that secures them by setting various HTTP headers.
HTTP headers provide a first line of defense against common web vulnerabilities, but developers often miss which headers to set or misconfigure them. Helmet automatically applies a suite of header-setting middleware functions to Express apps, each addressing specific security concerns. Rather than requiring developers to manually research and implement individual headers, Helmet bundles sensible defaults that follow security best practices and can be customized per application needs.
Helmet suits any Express-based web application where security is a concern, from small projects to large production systems. It is particularly valuable for teams without dedicated security expertise, as it reduces the cognitive load of security header configuration. The tool integrates as standard middleware and can be adopted incrementally, enabling or disabling specific header protections as needed.
The project maintains a steady stream of updates addressing new security considerations and compatibility with evolving Express versions. Maintenance activity shows consistent attention to reported issues and pull requests. The codebase is written in TypeScript, providing type safety for developers integrating the middleware into their applications.
