Setting up a dev environment

Swagger UI includes a development server that provides hot module reloading and unminified stack traces, for easier development.


  • git, any version
  • NPM 6.x

Generally, we recommend following guidelines from Node.js Releases to only use Active LTS or Maintenance LTS releases.

Current Node.js Active LTS:

  • Node.js 12.x
  • NPM 6.x

Current Node.js Maintenance LTS:

  • Node.js 10.x
  • NPM 6.x

Unsupported Node.js LTS that should still work:

  • Node.js 8.13.0 or greater
  • NPM 6.x


  1. git clone
  2. cd swagger-ui
  3. npm install
  4. npm run dev
  5. Wait a bit
  6. Open http://localhost:3200/

Bonus points

  • Swagger UI includes an ESLint rule definition. If you use a graphical editor, consider installing an ESLint plugin, which will point out syntax and style errors for you as you code.
    • The linter runs as part of the PR test sequence, so don't think you can get away with not paying attention to it!