How to fix Error: No certificates were found (TLS certificate not configured) in Node.js

# Check if files exist
ls -la /path/to/your/cert.pem
ls -la /path/to/your/key.pem

# On Windows, use dir instead
dir C:\\path\\to\\cert.pem

const fs = require('fs');
const https = require('https');
const path = require('path');

// BAD: Relative path
const options = {
  cert: fs.readFileSync('cert.pem'),
  key: fs.readFileSync('key.pem'),
};

// GOOD: Absolute path using path.join with __dirname
const options = {
  cert: fs.readFileSync(path.join(__dirname, '../certs/cert.pem')),
  key: fs.readFileSync(path.join(__dirname, '../certs/key.pem')),
};

// GOOD: Full absolute path
const options = {
  cert: fs.readFileSync('/etc/ssl/certs/cert.pem'),
  key: fs.readFileSync('/etc/ssl/private/key.pem'),
};

# Check current file permissions
ls -l /path/to/cert.pem
ls -l /path/to/key.pem

# Ensure the file is readable (owner must have read permission)
chmod 644 /path/to/cert.pem
chmod 600 /path/to/key.pem  # Key should be more restricted

# If running as a different user, ensure they own the files or belong to right group
chown nodeuser:nodeuser /path/to/cert.pem
chown nodeuser:nodeuser /path/to/key.pem

const fs = require('fs');
const https = require('https');
const path = require('path');

try {
  const cert = fs.readFileSync(path.join(__dirname, 'cert.pem'));
  const key = fs.readFileSync(path.join(__dirname, 'key.pem'));

  const options = { cert, key };
  const server = https.createServer(options, (req, res) => {
    res.writeHead(200);
    res.end('Hello HTTPS!');
  });

  server.listen(443, () => console.log('HTTPS server running'));
} catch (err) {
  console.error('Failed to load certificates:', err.message);
  process.exit(1);
}

# Check if certificate is in PEM format (should start with -----BEGIN)
head -1 /path/to/cert.pem
# Should output: -----BEGIN CERTIFICATE-----

# Check if key is in PEM format
head -1 /path/to/key.pem
# Should output: -----BEGIN RSA PRIVATE KEY----- or -----BEGIN PRIVATE KEY-----

# Convert DER certificate to PEM
openssl x509 -inform DER -in cert.der -out cert.pem

# Convert DER key to PEM
openssl rsa -inform DER -in key.der -out key.pem

const fs = require('fs');
const https = require('https');
const path = require('path');

const certPath = process.env.CERT_PATH || path.join(__dirname, 'cert.pem');
const keyPath = process.env.KEY_PATH || path.join(__dirname, 'key.pem');

try {
  const options = {
    cert: fs.readFileSync(certPath),
    key: fs.readFileSync(keyPath),
  };

  const server = https.createServer(options, handler);
  server.listen(process.env.PORT || 443);
} catch (err) {
  console.error(`Certificate loading failed: ${err.message}`);
  console.error(`Looked for cert at: ${certPath}`);
  console.error(`Looked for key at: ${keyPath}`);
  process.exit(1);
}

export CERT_PATH=/etc/ssl/private/cert.pem
export KEY_PATH=/etc/ssl/private/key.pem