swagger-storage

Persist the request bodies you type into Swagger UI's "Try it out" panel, and automatically re-seed them the next time you open the docs — across page refreshes and server restarts.

Values are stored in the browser's localStorage, namespaced by a token unique to your project (generated automatically on npm install), so multiple Swagger projects served from the same origin/port never mix up each other's data.

Install

npm install swagger-storage

On install, a postinstall script generates a unique token and writes it to your package.json:

{
  "swaggerStorage": {
    "token": "b3f1c9d2-..."
  }
}

Commit this. It's what gives your project a stable identity in localStorage.

Usage

Drop-in replacement for swagger-ui-express:

const express = require('express')
const swaggerStorage = require('swagger-storage/express')
const swaggerDocument = require('./swagger.json')

const app = express()
app.use('/api-docs', swaggerStorage.serve, swaggerStorage.setup(swaggerDocument))

app.listen(3000)

That's it. Type a value into a request body field under "Try it out," refresh the page (or restart the server), and it comes back.

How it works

• setup() reads your project's token from package.json and injects it into the Swagger UI page, along with a small browser script.
• That script watches Swagger UI's internal state for request-body changes and writes them to localStorage under a key like swagger-storage:<token>:<method>:<path>.
• On page load, it reads back any saved values for the current spec's operations and re-seeds them into Swagger UI before you interact with the page.

Options

setup() has the same signature as swagger-ui-express's setup() — pass a swaggerOptions object as usual. One extra option:

swaggerStorage.setup(swaggerDocument, {
  swaggerStorageToken: 'custom-token' // overrides the token read from package.json
})

Scope (v1)

• Only swagger-ui-express is supported (not swagger-ui-react or plain CDN embeds).
• Only the request body is persisted — not query/path parameters, headers, auth, or the selected server/content-type.
• Storage is localStorage, so it's per-browser, per-origin. Data doesn't sync across machines or browsers.

Requirements

• swagger-ui-express >= 4 as a peer dependency.
• npm (the postinstall token generation relies on INIT_CWD, which is npm-specific; pnpm/yarn users can set swaggerStorage.token in package.json manually, or pass swaggerStorageToken explicitly).

License

MIT