Error: Cannot find module 'ms-identity-javascript-nodejs-tutorial\1-Authentication\1-sign-in\App\node_modules\msal-node-wrapper\dist\index.js'. Please verify that the package.json has a valid "main" entry

[sarathys]

Which version of Microsoft.Identity.Client are you using?
"@azure/msal-node": "^2.7.0"

Note that to get help, you need to run the latest version.

Repro

cd ms-identity-javascript-nodejs-tutorial\1-Authentication\1-sign-in\App
npm install
npm start

Expected behavior
nodejs server starts and listens on port 4000 (as per the sample)

Actual behavior
Get this error

msal-node-tutorial-signin@1.0.0 start
node server.js

node:internal/modules/cjs/loader:502
throw err;
^

Error: Cannot find module 'C:\git\ms-identity-javascript-nodejs-tutorial\1-Authentication\1-sign-in\App\node_modules\msal-node-wrapper\dist\index.js'. Please verify that the package.json has a valid "main" entry
at tryPackage (node:internal/modules/cjs/loader:494:19)
at Function._findPath (node:internal/modules/cjs/loader:795:18)
at Function._resolveFilename (node:internal/modules/cjs/loader:1235:27)
at Function._load (node:internal/modules/cjs/loader:1075:27)
at TracingChannel.traceSync (node:diagnostics_channel:322:14)
at wrapModuleLoad (node:internal/modules/cjs/loader:219:24)
at Module.require (node:internal/modules/cjs/loader:1340:12)
at require (node:internal/modules/helpers:138:16)
at Object. (C:\git\ms-identity-javascript-nodejs-tutorial\1-Authentication\1-sign-in\App\app.js:9:32)
at Module._compile (node:internal/modules/cjs/loader:1565:14) {
code: 'MODULE_NOT_FOUND',
path: '\\?\C:\git\ms-identity-javascript-nodejs-tutorial\1-Authentication\1-sign-in\App\node_modules\msal-node-wrapper\package.json',
requestPath: 'msal-node-wrapper'
}

Node.js v22.12.0

[wbqtac]

got the same error. Actually, I first download the sample code provided by azure portal, and then follow the docs find this tutorial code. Neither works.

[nandbit]

I managed to make it work using the following steps.

In the ms-identity-javascript-nodejs-tutorial/1-Authentication/1-sign-in/App directory run:

1. npm install
2. cd node_modules/msal-node-wrapper
3. npm run build

Now the dist folder should be present in the node_modules/msal-node-wrapper

4. cd back into ms-identity-javascript-nodejs-tutorial/1-Authentication/1-sign-in/App
5. npm start

This should start the server on (by the tutorial default) port 4000.

[san]

@nandbit is correct. In addition, you can update postinstall line in package.json file to run build also.

- "postinstall": "cd ../../../Common/msal-node-wrapper && npm install"
+ "postinstall": "cd ../../../Common/msal-node-wrapper && npm install && npm run build"