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MinIO speaks the S3 API with AWS Signature V4 against your own server endpoint (e.g. http://localhost:9000). MinIO is self-hosted, so the endpoint is required and path-style addressing is used by default. Credentials (access key + secret key from the MinIO Console) are created the same way in both runtimes, see MinIO Credentials.

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Node (server-side)

pnpm add @struktoai/mirage-node

import { MinIOResource, MountMode, Workspace } from '@struktoai/mirage-node'

const minio = new MinIOResource({
  bucket: process.env.MINIO_BUCKET!,
  endpoint: process.env.MINIO_ENDPOINT!,
  accessKeyId: process.env.MINIO_ACCESS_KEY!,
  secretAccessKey: process.env.MINIO_SECRET_KEY!,
})

const ws = new Workspace({ '/bucket/': minio }, { mode: MountMode.READ })
const res = await ws.execute('ls /bucket/')
console.log(res.stdoutText)

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Browser (presigned URLs)

pnpm add @struktoai/mirage-browser
The browser MinIOResource is secret-free, your backend signs each operation using your MinIO keys and returns a URL. MinIO accepts AWS Signature V4, so @aws-sdk/s3-request-presigner works, pointed at your MinIO endpoint.

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1. Server: sign URLs with the MinIO endpoint

import {
  CopyObjectCommand,
  DeleteObjectCommand,
  GetObjectCommand,
  HeadObjectCommand,
  ListObjectsV2Command,
  PutObjectCommand,
  S3Client,
} from '@aws-sdk/client-s3'
import { getSignedUrl } from '@aws-sdk/s3-request-presigner'

const client = new S3Client({
  region: 'us-east-1',
  endpoint: process.env.MINIO_ENDPOINT,
  forcePathStyle: true,
  credentials: {
    accessKeyId: process.env.MINIO_ACCESS_KEY!,
    secretAccessKey: process.env.MINIO_SECRET_KEY!,
  },
})
const BUCKET = process.env.MINIO_BUCKET!

app.post('/presign/minio', async (req, res) => {
  const { path, op, opts } = req.body
  const key = path.replace(/^\/+/, '')
  const ttl = typeof opts?.ttlSec === 'number' ? opts.ttlSec : 300
  let cmd
  switch (op) {
    case 'GET':    cmd = new GetObjectCommand({ Bucket: BUCKET, Key: key }); break
    case 'PUT':    cmd = new PutObjectCommand({ Bucket: BUCKET, Key: key, ContentType: opts?.contentType }); break
    case 'HEAD':   cmd = new HeadObjectCommand({ Bucket: BUCKET, Key: key }); break
    case 'DELETE': cmd = new DeleteObjectCommand({ Bucket: BUCKET, Key: key }); break
    case 'LIST':   cmd = new ListObjectsV2Command({
      Bucket: BUCKET,
      Prefix: opts?.listPrefix,
      Delimiter: opts?.listDelimiter,
      ContinuationToken: opts?.listContinuationToken,
    }); break
    case 'COPY':   cmd = new CopyObjectCommand({
      Bucket: BUCKET,
      Key: key,
      CopySource: `${BUCKET}/${opts?.copySource}`,
    }); break
  }
  res.json({ url: await getSignedUrl(client, cmd, { expiresIn: ttl }) })
})
MinIO uses path-style URLs (forcePathStyle: true), virtual-hosted style requires extra DNS setup on a self-hosted server.

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2. Browser: wire it up

import { MinIOResource, MountMode, Workspace } from '@struktoai/mirage-browser'

const minio = new MinIOResource({
  bucket: 'my-bucket',
  endpoint: 'http://localhost:9000',
  presignedUrlProvider: async (path, op, opts) => {
    const r = await fetch('/presign/minio', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ path, op, opts }),
    })
    const { url } = await r.json()
    return url
  },
})

const ws = new Workspace({ '/bucket/': minio }, { mode: MountMode.READ })
endpoint on the browser config is only used for display/logging; the actual endpoint is baked into the presigned URLs your backend returns.

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3. CORS

MinIO answers CORS preflights for all origins by default, so local dev typically works without configuration. To restrict origins, set the server environment variable and restart MinIO: 
MINIO_API_CORS_ALLOW_ORIGIN=http://localhost:5173,https://app.example.com
See the MinIO resource docs for the equivalent Python wiring.