MockServer Blog — API Mocking Guides, Developer Tips & JSON Tools

Apr 21, 2026 4 min read

API Rate Limiting Explained: What It Is and How to Handle It

Almost every public API has rate limits. Learn what they are, why they exist, the different strategies APIs use to enforce them, and how to handle rate limit errors gracefully in your code.

Apr 21, 2026 3 min read

Postman vs Mock API Tools: Which One Should You Use?

Postman and mock API tools both appear in developer workflows, but they solve different problems. Here's how they compare and when to use each one.

Apr 20, 2026 3 min read

JSON Schema Explained: How to Validate API Responses Like a Pro

JSON Schema lets you define the exact structure your API should return and automatically validate every response against it. Here's how it works and why your team should be using it.

Apr 20, 2026 3 min read

What Is a Webhook? How They Work and How to Test Them Locally

Webhooks power everything from payment notifications to GitHub CI triggers. Learn what they are, how they differ from REST APIs, and how to test them during local development.

Apr 20, 2026 4 min read

How to Use Mock APIs in React Applications

Step-by-step guide to integrating mock API endpoints into your React app using fetch and axios — so you can build UI components without waiting for a real backend.

Apr 19, 2026 4 min read

How to Simulate API Errors and Edge Cases in Frontend Development

Real APIs don't always return 200. Learn how to simulate 400, 401, 404, 500 errors and empty states in your frontend so your app handles failure gracefully before it ships.

Apr 19, 2026 4 min read

What Is CORS and How to Fix CORS Errors in Your API

CORS errors are one of the most common frustrations in web development. Here's exactly what causes them, what the browser is doing, and how to fix them once and for all.

Mar 30, 2026 7 min read

What Is API Authentication? OAuth, API Keys, and JWT Explained

Not sure which API authentication method to use? This plain-English guide explains API keys, JWT, and OAuth 2.0 — and when to use each one.

Mar 29, 2026 7 min read

HTTP Status Codes Explained: The Complete Developer Reference

Every HTTP response comes with a status code. This complete reference explains what every status code means, when to use it, and how to handle it in your application.

Mar 23, 2026 3 min read

What Is an API Endpoint? A Clear Guide for Beginners

Confused about API endpoints? This beginner-friendly guide explains what an API endpoint is, how it works, and how to create one with examples.