I have generated the SSL using openssl using the following commands. Which have generated the cert and key file but where do I get the ca-bundle file. I need the ca-bundle file to include in nodejs application else it is showing not secure warning.

openssl genrsa -out server-key.pem 1024
openssl req -new -key server-key.pem -out server-csr.pem
openssl x509 -req -in server-csr.pem -signkey server-key.pem -out server-cert.pem

my server's code

const options = {
    key: fs.readFileSync("path-to-key"),
    cert: fs.readFileSync("path-to-crt"),
    ca: [fs.readFileSync("path-to-ca-bundle"), fs.readFileSync("path-to-crt")],
    requestCert: false,
    rejectUnauthorized: false
}
const server = https.createServer(options, app);