How to solve this Error: Cannot find module 'ibm-watson' - node.js

Question

I have installed ibm-watson using "npm install ibm-watson" command
I can see the folder and its file in the node_modules folder, but still showing this error.
Node version - v10.15.3
const watson = require('ibm-watson');
const { IamAuthenticator } = require('ibm-watson/auth');
const { BasicAuthenticator } = require('ibm-watson/auth');
// to get an IAM Access Token
const authorization = new watson.AuthorizationV1({
authenticator: new IamAuthenticator({ apikey: 'fakekey-1234' }),
});
authorization.getToken(function (err, token) {
if (!token) {
console.log('error: ', err);
} else {
// Use your token here
}
});
Other modules are importing fine, Only this module not importing.
internal/modules/cjs/loader.js:584
throw err;
^
Error: Cannot find module 'ibm-watson'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
at Function.Module._load (internal/modules/cjs/loader.js:508:25)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:22:18)
at Object.<anonymous>

Answer 1

I've just faced this issue. I did not install the correct version of the package. Please check the apidocs for Node to see the correct version of IBM Watson npm package that you need. for me I needed 5.6.0.
You can install it with the following command:
npm install ibm-watson#^5.6.0

Answer 2

As you are getting a token, I am going to guess that you are using Speech To Text. As the comments have suggested the failing line is const watson = require('ibm-watson'); because it isn't exported. Instead you would use, as per the API documentation - https://cloud.ibm.com/apidocs/speech-to-text/speech-to-text?code=node#authentication:
const SpeechToTextV1 = require('ibm-watson/speech-to-text/v1');
const { IamAuthenticator } = require('ibm-watson/auth');
const { IamTokenManager } = require('ibm-watson/auth');
If it's not STT that you are using then the other services work the same way when requiring ibm-watson. Links to the API Docs can be found here - https://cloud.ibm.com/apidocs

Answer 3

I faced the same problem.　
After reading the code, I understood.
There is only sdk.ts file, not index.ts file.
https://github.com/watson-developer-cloud/node-sdk
// const watson = require('ibm-watson');
const watson = require('ibm-watson/sdk');
But I still got the error.
Eventually it worked if I wrote the following
import AuthorizationV1 from 'ibm-watson/authorization/v1'
import { IamAuthenticator } from 'ibm-watson/auth'
const apikey = '********'
const authorization = new AuthorizationV1({
url: 'https://iam.cloud.ibm.com/identity/token',
authenticator: new IamAuthenticator({ apikey }),
})
authorization.getToken(function (err, token) {
if (!token) {
console.log('error: ', err);
} else {
// Use your token here
}
});
But there is a CORS problem. I don't know any more.
The answer was written here. I need to do it on the server side
https://github.com/watson-developer-cloud/node-sdk/issues/884#issuecomment-515050023