How to Share API Collections With Your Team
Learn how to share API collections with your team: shared vs local workspaces, sharing environments safely, and migrating with import/export.
How to Upload Files via API: Multipart & Base64
Learn how to upload files via API: multipart/form-data vs Base64 in JSON, when to use each, and how to send file uploads correctly.
How to Automate API Testing (Without the Headaches)
Learn how to automate API testing: add assertions, group requests, drive them with data, and run them repeatably so regressions surface early.
WebSocket vs REST: When to Use Each
WebSocket vs REST: one holds a connection open for real-time, the other is request/response. Learn when to use each, with practical examples.
API Throttling vs Rate Limiting: The Difference
Throttling smooths traffic; rate limiting caps it and returns 429. Learn the difference between API throttling and rate limiting, with clear examples.
API Rate Limiting: How to Handle 429 Errors
Learn how API rate limiting works, what HTTP 429 and Retry-After mean, and how to handle and test rate limits without getting your client blocked.
How to Test an API: A Step-by-Step Guide
New to API testing? Learn how to test an API step by step: send a request, inspect the response, assert on it, and then automate the run.
How to Run API Tests in CI/CD (with Reports)
Learn how to run API tests in CI/CD: trigger tests on every push, gate deploys on failures, and publish reports your team can read.
How to Configure Proxy Settings for API Requests
Learn how to configure proxy settings for API requests: route calls through a proxy host and port, handle corporate proxies, and debug traffic.
How to Auto-Generate API Documentation
Learn how to auto-generate API documentation from your requests and example responses, and publish docs your team can actually use.
How to Build API Automation Flows (Visual Guide)
Learn how to build API automation flows: chain requests, extract variables, and add conditions so a whole scenario runs from start to finish.
How to Run API Tests from the Command Line
Learn how to run API tests from the command line, with Newman and beyond, so your test suite fits cleanly into scripts and CI pipelines.
How to Set Up API Monitoring (Step by Step)
Learn how to set up API monitoring: schedule requests, assert on the results, track uptime and latency, and get alerted the moment an API breaks.
API Load and Performance Testing: A Practical Guide
A practical guide to API load and performance testing: virtual users, p50/p95/p99 latency, finding the breaking point, and the right tools.
How to Test gRPC Services and APIs
Learn how to test gRPC services: invoke methods from a .proto contract, assert on typed responses, and use tools like grpcurl and ghz.
How to Test WebSocket APIs (Tools & Techniques)
Learn how to test WebSocket APIs: open a connection, send and assert on messages, and use the tools that make real-time testing manageable.
How to Chain API Requests (Pass Data Between Calls)
Learn how to chain API requests: capture a value such as a token from one response and reuse it in the next request, with no copy-paste.
How to Write API Tests and Assertions
Learn how to write API tests and assertions that check status codes, response bodies, and schemas, so broken contracts fail loudly and early.
Pre-request and Post-response Scripts in API Testing
Learn how pre-request and post-response scripts work in API testing: prepare data before a call, then validate or extract values after it.
How to Use Environment Variables in API Requests
Learn how to use environment variables in API requests to switch between dev, staging, and prod cleanly, and to keep secrets out of your requests.
Variables in API Testing: Scopes & Precedence
Master variables in API testing: the five scopes, how precedence resolves name conflicts, and how to read and write variables from scripts.
The Best API Testing Tools in 2026 (by Category)
The best API testing tools in 2026, grouped by category: clients, automation, load, and contract testing, so you can pick the right tool for the job.
How to Use Bearer Tokens for API Authentication
Learn how Bearer token authentication works, how to send the Authorization header correctly, and how to capture and refresh tokens when testing APIs.
How to Set Up API Key Authentication
Learn how to set up API key authentication the right way: header vs query string, key generation and rotation, and keeping keys out of logs.
API Key vs OAuth: Which Should You Use?
API keys are simple; OAuth 2.0 is scoped and revocable. Compare API key vs OAuth on security, lifetime, and use cases to pick the right one.
OAuth vs JWT: What's the Difference?
OAuth and JWT solve different problems: one is a protocol, the other a token format. Learn the real difference and when to use each.
OAuth 2.0 Flows Explained (With Examples)
Authorization Code, PKCE, Client Credentials, Device Code: understand every OAuth 2.0 flow, which one to use, and which flows are now deprecated.
API Authentication Methods: A Complete Guide
API keys, Bearer tokens, JWT, OAuth 2.0, Basic auth: compare every API authentication method, when to use it, and how to implement it correctly.
gRPC vs REST: When to Use Which Protocol
gRPC vs REST compared: transport, payloads, streaming, and typing. Learn which protocol fits your API and how to work with each one.
GraphQL vs REST: How to Choose and Test Both
GraphQL or REST? Compare how each handles queries, over-fetching, and tooling, then learn how to test both kinds of API effectively.
Webhooks vs APIs: What's the Difference?
Webhooks push events to you; APIs wait to be polled. Learn the difference between webhooks and APIs, when to use each, and how to test both.
How to Fix 401 Unauthorized Errors When Testing APIs
A 401 means your request isn't authenticated. Learn what causes 401 Unauthorized errors, how to read the response, and how to fix them fast.
How to Fix CORS Errors When Testing APIs
CORS errors blocking your API tests? Learn what triggers them, how to read the preflight request, and the fastest ways to fix CORS when testing APIs.
How to convert OpenAPI spec to an API collection
Easily convert your OpenAPI spec into a fully organized API collection with Requestly—no manual setup required for fast and accurate testing.
Kanishk Rawat · Feb 11, 2026
API Design Guide: Key Principles, Best Practices & Steps
Clear, actionable guide to API design covering key principles, essential best practices, and step-by-step processes for building robust APIs.
Parth Bhardwaj · Oct 17, 2025
Understanding API Endpoints in Detail
Explore the different types of API endpoints, their structure, security, and best practices for designing and managing APIs in this detailed guide.
Parth Bhardwaj · Oct 17, 2025
Choosing the Best REST API Client Tools for Your Project
Discover how to choose the best REST API client tools for your project with key features, comparison tips, and top tool recommendations
Parth Bhardwaj · Oct 17, 2025
How Cyrisma Managed 125K APIs with Requestly
Cyrisma improved API management with Requestly's API client, boosting security, reducing errors, and accelerating development. Learn how they did it
Sagar Soni · Feb 19, 2025
How to Test FastAPI Efficiently with Requestly API Client
Efficiently test your FastAPI endpoints with Requestly API Client for seamless debugging and optimizing your API development workflow.
Dinesh Thakur · Feb 13, 2025
Hopscotch vs Bruno vs Requestly: Which One Is Best for You?
Compare Hopscotch, Bruno, and Requestly to find the best API client. Explore features, performance, and pricing to choose the right tool for you
Dinesh Thakur · Jan 29, 2025
Hopscotch vs Insomnia vs Requestly: Which One Is Best for You?
Compare Hopscotch, Insomnia, and Requestly to find the best API client. Explore features, performance, and pricing to choose the right tool for you
Dinesh Thakur · Jan 29, 2025
Insomnia vs Bruno vs Requestly: Which One Is Best for You?
Compare Insomnia, Bruno, and Requestly to find the best API client. Explore features, performance, and pricing to choose the right tool for you
Dinesh Thakur · Jan 29, 2025
Postman vs Bruno vs Requestly: Which One Is Best for You?
Compare Postman, Bruno, and Requestly to find the best API client. Explore features, performance, and pricing to choose the right tool for you
Dinesh Thakur · Jan 29, 2025
Postman vs Insomnia vs Requestly: Which One Is Best for You?
Compare Postman, Insomnia, and Requestly to find the best API client. Explore features, performance, and pricing to choose the right tool for you
Dinesh Thakur · Jan 29, 2025