Question

MongooseServerSelectionError: self signed certificate in certificate chain

Why am I getting this error: MongooseServerSelectionError: self signed certificate in certificate chain.

I’m using mongoose (v6.8.3) to connect to my mongodb database. As far as I know my code should work just fine:

let options = {
  useNewUrlParser: true,
  useUnifiedTopology: true,
};
const dbCertPath = path.resolve('./ca-certificate.crt');

if (envVars.CA_CERT) {
  fs.writeFileSync(dbCertPath, envVars.CA_CERT);
  options = {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    ssl: true,
    sslCA: `${dbCertPath}`,
  };
}

mongoose
  .connect(mongodbUrl, options)
  .then(() => {
    logger.info('Connected to MongoDB');
  })
  .catch((error) => {
    logger.error(error);
  });

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alexdo
Site Moderator
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January 28, 2023

Hello @ricardodolnl

This seems be to an expected behavior since MongoDB does more strict validation on SSL certificate.

A similar error was reported in GitHub which you can check here. There is also a proposed quick if which you can also try to implement

https://github.com/Automattic/mongoose/issues/9147

Hope that this helps!