1. function validateConfig(config) {
  2. // Validate required fields
  3. if (!config.appName || typeof config.appName !== 'string' || config.appName.trim() === '') {
  4. return "Error: appName is required and must be a non-empty string.";
  5. }
  7. if (!config.logLevel || typeof config.logLevel !== 'string' || !['error', 'warn', 'info', 'debug', 'trace'].includes(config.logLevel.toLowerCase())) {
  8. return "Error: logLevel must be one of: error, warn, info, debug, trace.";
  9. }
  11. if (!config.logFile || typeof config.logFile !== 'string' || config.logFile.trim() === '') {
  12. return "Error: logFile is required and must be a non-empty string.";
  13. }
  15. if (!config.database.host || typeof config.database.host !== 'string' || config.database.host.trim() === '') {
  16. return "Error: database.host is required and must be a non-empty string.";
  17. }
  19. if (!config.database.port || typeof config.database.port !== 'number' || config.database.port < 1 || config.database.port > 65535) {
  20. return "Error: database.port must be a number between 1 and 65535.";
  21. }
  23. if (!config.database.user || typeof config.database.user !== 'string' || config.database.user.trim() === '') {
  24. return "Error: database.user is required and must be a non-empty string.";
  25. }
  27. if (!config.database.password || typeof config.database.password !== 'string' || config.database.password.trim() === '') {
  28. return "Error: database.password is required and must be a non-empty string.";
  29. }
  32. // Validate optional fields (if present)
  33. if (config.apiKey && typeof config.apiKey !== 'string' || config.apiKey.trim() === '') {
  34. return "Error: apiKey must be a non-empty string.";
  35. }
  37. if (config.timeout && typeof config.timeout !== 'number' || config.timeout <= 0) {
  38. return "Error: timeout must be a number greater than 0.";
  39. }
  42. return null; // Configuration is valid
  43. }

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