_Index

Introduction to Error Handling in REST APIs

Learn error handling fundamentals for REST APIs including consistent error responses, appropriate HTTP status codes, and developer-friendly error messages.

HTTP Status Codes Overview — Choosing the Right Code

Learn HTTP status code categories for REST APIs including 2xx success, 3xx redirection, 4xx client errors, and 5xx server errors with appropriate usage.

2xx Success Codes — Standard Response Status Codes

Learn HTTP 2xx success status codes for REST APIs including 200 OK, 201 Created, 202 Accepted, and 204 No Content with proper usage.

3xx Redirection Codes — Redirecting Clients to New URLs

Learn HTTP 3xx redirection status codes for REST APIs including 301 Moved Permanently, 302 Found, 303 See Other, and 304 Not Modified.

4xx Client Errors — Bad Requests and Client Mistakes

Learn HTTP 4xx client error status codes for REST APIs including 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, and 422 Validation Error.

5xx Server Errors — Handling Server Failures

Learn HTTP 5xx server error status codes for REST APIs including 500 Internal Server Error, 502 Bad Gateway, 503 Service Unavailable, and 504 Gateway Timeout.

Error Response Format — RFC 7807 Problem Details

Learn RFC 7807 Problem Details for REST API error responses including standardized fields for type, title, status, detail, and instance.

Validation Errors — Field-Level Error Reporting

Learn validation error handling in REST APIs with field-level error reporting, structured validation details, and consistent error code patterns.

Authentication Errors — 401 and 403 Responses

Learn authentication and authorization error handling in REST APIs including 401 Unauthorized for missing auth and 403 Forbidden for insufficient permissions.

Not Found Errors — Handling Missing Resources

Learn not-found error handling in REST APIs including 404 responses, resource identification, and search suggestions for missing resources.

Conflict Errors — Handling Duplicate and State Conflicts

Learn conflict error handling in REST APIs including 409 Conflict for duplicate resources, stale versions, and business rule violations.

Rate Limit Errors — 429 Too Many Requests

Learn rate limit error handling in REST APIs including 429 Too Many Requests, Retry-After headers, rate limit headers, and client retry strategies.

Error Middleware — Global Error Handlers in Express and FastAPI

Learn global error middleware patterns for Express.js and FastAPI including custom error classes, error factories, and consistent error response formatting.

Error Logging — Structured Error Logging for APIs

Learn structured error logging for REST APIs including log levels, context enrichment, request IDs, and integration with logging platforms.

Error Monitoring — Tracking Errors with Sentry

Learn error monitoring for REST APIs using Sentry including error tracking, performance monitoring, release tracking, and alert configuration.

Error Handling Project — Complete Error System

Apply everything learned to build a comprehensive error handling system with custom error classes, middleware, validation, logging, and monitoring.