JavaScript Error Handling: Strategies for Production Code
Try/catch is just the start. Here is how I structure error handling to actually help debugging instead of hiding problems. Error handling is the part of programming I used to neglect most. Throwing a try/catch around everything and logging the error felt sufficient until I had to debug production issues at 2 AM. Since then, I have developed a more deliberate approach to error handling that prioritizes debuggability and user experience. Throwing Meaningful Errors The built-in Error class is fine for generic errors, but I create custom error subclasses for different failure categories. This lets me catch specific error types and let others propagate. The error message should describe what went wrong and include relevant context. the input that caused the failure, the expected state, the actual state. class ValidationError extends Error { constructor(field, message) { super(message); this.name = 'ValidationError'; this.field = field; } } class NetworkError extends Error { constructor(url, status) { super('Request to ' + url + ' failed with status ' + status); this.name = 'NetworkError'; this.url = url; this.status = status; } } Custom errors carry structured data that error handlers can use to make decisions.…