How to create JWT for Google service account using Node.js? - node.js

Question

According to this guide i have successfully create JWT for Google service account using Java example and it's worked. However, these lines are still "magical" for me:
GoogleCredential credential = GoogleCredential.fromStream(resourceAsStream);
PrivateKey privateKey = credential.getServiceAccountPrivateKey();
But i can't repeat it using Node.js. Postman says "Could not get any response".
Here is my code.
const jwt = require('jsonwebtoken');
const TOKEN_DURATION_IN_SECONDS = 3600;
const issueJWT = (
issuedAt = Math.floor(Date.now() / 1000),
serviceAccount = require('path/to/service-account.json')
) =>
jwt.sign(
{
'iss': serviceAccount.client_email,
'sub': serviceAccount.client_email,
'aud': `https://${SERVICE_NAME}/${API_NAME}`,
'iat': issuedAt,
'exp': issuedAt + TOKEN_DURATION_IN_SECONDS,
},
serviceAccount.private_key,
{
algorithm: 'RS256',
header: {
'kid': serviceAccount.private_key_id,
'typ': 'JWT',
'alg': 'RS256',
},
}
);
Onlinde decoder show same header and body for tokens created using Node.js and Java.
So, i assume that signatures are different.
Via jwt from java:
curl --header "Authorization: Bearer {jwt-from-java}" https://bigtableadmin.googleapis.com/v2/projects/{project-name}/instances -v
>
* schannel: client wants to read 102400 bytes
* schannel: encdata_buffer resized 103424
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: encrypted data got 836
* schannel: encrypted data buffer: offset 836 length 103424
* schannel: decrypted data length: 773
* schannel: decrypted data added: 773
* schannel: decrypted data cached: offset 773 length 102400
* schannel: encrypted data length: 34
* schannel: encrypted data cached: offset 34 length 103424
* schannel: decrypted data length: 5
* schannel: decrypted data added: 5
* schannel: decrypted data cached: offset 778 length 102400
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: decrypted data buffer: offset 778 length 102400
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 778
* schannel: decrypted data buffer: offset 0 length 102400
< HTTP/1.1 200 OK
< Content-Type: application/json; charset=UTF-8
< Vary: X-Origin
< Vary: Referer
< Date: Sat, 21 Jul 2018 00:11:31 GMT
< Server: ESF
< Cache-Control: private
< X-XSS-Protection: 1; mode=block
< X-Frame-Options: SAMEORIGIN
< X-Content-Type-Options: nosniff
< Alt-Svc: quic=":443"; ma=2592000; v="44,43,39,35"
< Accept-Ranges: none
< Vary: Origin,Accept-Encoding
< Transfer-Encoding: chunked
<
{
"instances": [
...
]
}
* Connection #0 to host bigtableadmin.googleapis.com left intact
Via jwt from node.js:
curl --header "Authorization: Bearer {jwt-from-node}" https://bigtableadmin.googleapis.com/v2/projects/{project-name}/instances -v
>
* schannel: client wants to read 102400 bytes
* schannel: encdata_buffer resized 103424
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: encrypted data got 836
* schannel: encrypted data buffer: offset 836 length 103424
* schannel: decrypted data length: 773
* schannel: decrypted data added: 773
* schannel: decrypted data cached: offset 773 length 102400
* schannel: encrypted data length: 34
* schannel: encrypted data cached: offset 34 length 103424
* schannel: decrypted data length: 5
* schannel: decrypted data added: 5
* schannel: decrypted data cached: offset 778 length 102400
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: decrypted data buffer: offset 778 length 102400
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 778
* schannel: decrypted data buffer: offset 0 length 102400
< HTTP/1.1 401 Unauthorized
< WWW-Authenticate: Bearer realm="https://accounts.google.com/"
< Vary: X-Origin
< Vary: Referer
< Content-Type: application/json; charset=UTF-8
< Date: Sat, 21 Jul 2018 00:08:58 GMT
< Server: ESF
< Cache-Control: private
< X-XSS-Protection: 1; mode=block
< X-Frame-Options: SAMEORIGIN
< X-Content-Type-Options: nosniff
< Alt-Svc: quic=":443"; ma=2592000; v="44,43,39,35"
< Accept-Ranges: none
< Vary: Origin,Accept-Encoding
< Transfer-Encoding: chunked
<
{
"error": {
"code": 401,
"message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
"status": "UNAUTHENTICATED"
}
}
* Connection #0 to host bigtableadmin.googleapis.com left intact
How can i create JWT for Google service account using Node.js?

Answer 1

So from the error message it looks like this is not a JWT specific issue. This Google Groups post shows that the issue is due an incorrect CURL command being used. Check the curl command syntax and access token placement to make sure it is valid.

Answer 2

Suddenly, now it's works without any changes in code.