Sometimes, we want to add custom certificate authority (CA) to Node.js.

In this article, we’ll look at how to add custom certificate authority (CA) to Node.js.

How to add custom certificate authority (CA) to Node.js?

To add custom certificate authority (CA) to Node.js, we can call https.globalAgent.options.ca.push with the certificate file.

For instance, we write

const trustedCa = [
  '/etc/pki/tls/certs/ca-bundle.crt',
  '/path/to/custom/cert.crt'
];

https.globalAgent.options.ca = [];
for (const ca of trustedCa) {
  https.globalAgent.options.ca.push(fs.readFileSync(ca));
}

We loop through the path strings in trustedCa with a for-of loop.

Then we call https.globalAgent.options.ca.push to push the certificate file that we read into memory with fs.readFileSync.

We set https.globalAgent.options.ca to an array before calling push so its value is always an array.

Conclusion

To add custom certificate authority (CA) to Node.js, we can call https.globalAgent.options.ca.push with the certificate file.