Troubleshooting

Common Issues and Solutions

1. OpenSSL Error on npm start

Error: Error: error:0308010C:digital envelope routines::unsupported

Solution: The project already includes the fix in package.json:

NODE_OPTIONS='--openssl-legacy-provider' ng serve

2. Module Not Found Errors

Solution: Clear cache and reinstall:

rm -rf node_modules package-lock.json
npm cache clean --force
npm install

3. Port Already in Use

Error: Port 4200 is already in use

Solution: Kill the process or use a different port:

# Kill process on port 4200 (Unix/Mac)
lsof -ti:4200 | xargs kill -9

# Or use different port
ng serve --port 4300

4. CORS Errors

Issue: API requests blocked by CORS policy

Solution:

• Configure backend to allow frontend origin
• Use proxy configuration during development:

Create proxy.conf.json:

{
  "/api": {
    "target": "https://api.onmarket.id",
    "secure": true,
    "changeOrigin": true
  }
}

Update angular.json:

"serve": {
  "options": {
    "proxyConfig": "proxy.conf.json"
  }
}

5. JWT Token Expired

Issue: Session expired errors

Solution:

• Token verification happens on each protected route
• User is automatically redirected to login
• No manual intervention needed

6. WebSocket Connection Issues

Issue: Socket.io connection fails

Solution:

• Check if WebSocket server is running
• Verify JWT token is valid
• Check network connectivity
• Verify API_ONMARKET_SERVER URL

7. Angular Material Theme Not Applied

Solution: Ensure custom-theme.scss is imported in angular.json:

"styles": [
  "src/custom-theme.scss",
  "src/styles.scss"
]

8. Build Memory Issues

Error: JavaScript heap out of memory

Solution: Increase Node.js memory limit:

export NODE_OPTIONS="--max-old-space-size=4096"
npm run build