Setting up a dev environment

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

Prerequisites

git, any version
Node.js >=20.3.0 and npm >=9.6.7 are the minimum required versions that this repo runs on, but we always recommend using the latest version of Node.js.

Steps

git clone https://github.com/swagger-api/swagger-ui.git
cd swagger-ui
npm install
npm run dev
Wait a bit
Open http://localhost:3200/

Using your own local api definition with local dev build

You can specify a local file in dev-helpers/dev-helper-initializer.js by changing the url parameter. This local file MUST be located in the dev-helpers directory or a subdirectory. As a convenience and best practice, we recommend that you create a subdirectory, dev-helpers/examples, which is already specified in .gitignore.

replace

1
url: "https://petstore.swagger.io/v2/swagger.json",

with

1
url: "./examples/your-local-api-definition.yaml",

Files in dev-helpers should NOT be committed to git. The exception is if you are fixing something in index.html, oauth2-redirect.html, dev-helper-initializer.js, or introducing a new support file.

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!