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}`,

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

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Site Moderator
Site Moderator badge
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

Hope that this helps!

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up

card icon
Get our biweekly newsletter

Sign up for Infrastructure as a Newsletter.

Sign up
card icon
Hollie's Hub for Good

Working on improving health and education, reducing inequality, and spurring economic growth? We’d like to help.

Learn more
card icon
Become a contributor

You get paid; we donate to tech nonprofits.

Learn more
Welcome to the developer cloud

DigitalOcean makes it simple to launch in the cloud and scale up as you grow – whether you’re running one virtual machine or ten thousand.

Learn more ->
DigitalOcean Cloud Control Panel
Get started for free

Enter your email to get $200 in credit for your first 60 days with DigitalOcean.

New accounts only. By submitting your email you agree to our Privacy Policy.

© 2023 DigitalOcean, LLC.