workos
Cloudflare Workers with "nodejs_compat" error: Dynamic require of "buffer/index.js" is not supported
"@workos-inc/node": "7.59.0"
Getting an error after enabling "nodejs_compat" compatibility flag in wrangler.jsonc. Full stack trace:
error running node_modules/.vite/deps_app/@workos-inc_node.js?v=54cb8c7e
Error: Dynamic require of "buffer/index.js" is not supported
at node_modules/.vite/deps_app/chunk-UP2VWCW5.js:9:9
at ../../node_modules/.pnpm/[email protected]/node_modules/iron-webcrypto/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1610:29)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]_/node_modules/iron-session/edge/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1902:24)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/common/iron-session/edge-iron-session-provider.js (node_modules/.vite/deps_app/@workos-inc_node.js:2148:18)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/index.worker.js (node_modules/.vite/deps_app/@workos-inc_node.js:12311:40)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at node_modules/.vite/deps_app/@workos-inc_node.js:12362:16
error running worker/hono/api.ts
Error: Dynamic require of "buffer/index.js" is not supported
at node_modules/.vite/deps_app/chunk-UP2VWCW5.js:9:9
at ../../node_modules/.pnpm/[email protected]/node_modules/iron-webcrypto/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1610:29)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]_/node_modules/iron-session/edge/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1902:24)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/common/iron-session/edge-iron-session-provider.js (node_modules/.vite/deps_app/@workos-inc_node.js:2148:18)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/index.worker.js (node_modules/.vite/deps_app/@workos-inc_node.js:12311:40)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at node_modules/.vite/deps_app/@workos-inc_node.js:12362:16
error running worker/index.ts
Error: Dynamic require of "buffer/index.js" is not supported
at node_modules/.vite/deps_app/chunk-UP2VWCW5.js:9:9
at ../../node_modules/.pnpm/[email protected]/node_modules/iron-webcrypto/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1610:29)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]_/node_modules/iron-session/edge/dist/index.js (node_modules/.vite/deps_app/@workos-inc_node.js:1902:24)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/common/iron-session/edge-iron-session-provider.js (node_modules/.vite/deps_app/@workos-inc_node.js:2148:18)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at ../../node_modules/.pnpm/@[email protected][email protected][email protected][email protected][email protected]_/node_modules/@workos-inc/node/lib/index.worker.js (node_modules/.vite/deps_app/@workos-inc_node.js:12311:40)
at __require2 (node_modules/.vite/deps_app/chunk-UP2VWCW5.js:15:50)
at node_modules/.vite/deps_app/@workos-inc_node.js:12362:16
7:23:52 PM [vite] Internal server error: Dynamic require of "buffer/index.js" is not supported
at async ProxyServer.fetch (node_modules/miniflare/src/workers/core/proxy.worker.ts:173:11)
Important note: it is an issue when running locally on miniflare only. Here is my current workaround for local development:
export const createWorkOSClient = async (env: Env): Promise<IWorkOS> => {
if (env.MOCK_WORKOS === 'true') {
return new WorkOSLocalDevMock()
}
const { WorkOS } = await import('@workos-inc/node')
return new WorkOS(env.WORKOS_API_KEY, {
clientId: env.WORKOS_CLIENT_ID,
})
}
@josephbuchma was this working in an earlier version of @workos-inc/node?
I am getting the same thing and happens specifically if I am using cloudflare/vite-plugin.
@TannerPerrien I think I've tried to downgrade the version, but not sure. Fortunately I found the workaround relatively quickly, because I don't have bandwidth for debugging this.
+1 experiencing this issue.
Any chance we can see your WorkOSLocalDevMock() implementation? @josephbuchma
Sorry for not adding more details about the mock. I abandoned that idea because mocking that class turned out to be very cumbersome. Instead I just lifted the localhost auth logic to the HTTP handlers.
const devAuthDefault = {
authenticated: false,
userId: 2,
user: {
object: 'user',
id: 'user_XXXXXXXXXXXXXXXXXXXXXXXXXX',
email: '[email protected]',
emailVerified: true,
firstName: 'Yosyp',
profilePictureUrl:
'https://workoscdn.com/images/v1/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX-Ho',
lastName: 'Buchma',
lastSignInAt: '2025-07-13T09:57:12.188Z',
createdAt: '2025-07-12T12:26:34.635Z',
updatedAt: '2025-07-13T09:57:12.188Z',
externalId: '2',
metadata: {},
},
}
let devAuth: typeof devAuthDefault | null = null
export const getDevAuth = (requestUrl: string) => {
if (requestUrl.startsWith('http://localhost') && !devAuth) {
devAuth = devAuthDefault
}
return devAuth
}
// Auth TRPC router
export const authAPIRouter = t.router({
// Handle auth callback
handleCallback: t.procedure
.input(z.object({ code: z.string() }))
.mutation(async ({ input, ctx }): Promise<{ user: User; ok: boolean }> => {
if (!input.code) {
throw new TRPCError({ code: 'BAD_REQUEST', message: 'No code provided' })
}
// LOCALHOST AUTH WORKAROUND:
const devAuth = getDevAuth(ctx.req.url)
if (devAuth) {
devAuth.authenticated = true
return {
ok: true,
user: devAuth.user as User,
}
}
// ^^^^^^^^^^^^^^^^^^^ I added similar block for all auth-related endpoints (and in auth middleware as well)
Hi all, since this issue appears to be more to the Cloudflare vite plugin than to @workos-inc/node, I have opened an issue there as well.
Feel free to comment/react for visibility 😄
@josephbuchma @ivogt
I downgraded the specific dependency causing the issue, iron-webcrypto, and it appears to be working fine with the vite plugin.
In my package.json
...
"overrides": {
"iron-webcrypto": "1.2.0"
},
...
@josephbuchma @ivogt
I downgraded the specific dependency causing the issue,
iron-webcrypto, and it appears to be working fine with the vite plugin.In my package.json
... "overrides": { "iron-webcrypto": "1.2.0" }, ...
Thank you. This has been huge pain. I had to move to rest api calls to work around that.