ModHeader

Use ModHeader. The ModHeader Chrome extension helps developers test API requests with a header editor and debug website in Chrome.

Open Source. The source code can be found here: https://github.com/Ahorm/open-modheader Use ModHeader to turn Chrome into a focused workspace for editing HTTP request and response fields during real work. It helps an API tester check behavior fast, without opening a heavy desktop stack. When testing API flows, you can change one value, reload the page, and see a clearer result for a login, route, or feature state. 🧩 Quick Header Checks ⚡ Run a quick HTTP header test before you blame code, cache, login state, or network noise. ⚡ Keep the ModHeader Chrome extension ready for release reviews, partner demos, support cases, and internal audits. ⚡ Use test API checks in the same browser where the product already lives, so the result feels tied to real product use. 💪 Why Teams Choose ModHeader ✓ ModHeader is made for teams that want control without clutter. ✓ The ModHeader extension gives you a simple place to prepare values, compare outcomes, and document what changed. ✓ It supports API testing with a clean rhythm that fits daily work. ✓ Small checks stay simple, so they do not become long investigations. 🛠️ How It Works 1. Open the page or service path you want to inspect. 2. Add a rule with the header editor, then keep the scope narrow and easy to review. 3. Confirm the result with an HTTP header tester before sharing notes. 4. Save a useful setup, so the next review starts faster and begins from proven steps. A busy team does not need more mystery. It needs a visible path from change to outcome. A REST API client may show the call, while a REST client application helps organize deeper checks across projects, teams, and release cycles. 📋 Practical Workflow Benefits ✅ Cut repeated setup during staging, support, and launch review. ✅ Keep each rule tied to a clear task, so normal browsing stays clean. ✅ Switch between roles, regions, and partner states with less manual typing. ✅ Capture evidence that engineers, QA, and support can understand at once. ✅ Remove temporary work after the session, so the next check starts fresh and does not rely on memory. Some defects hide in small details. A missing value can break access, change content, or send a user down the wrong path. This is where careful browser work and a REST client together can make the cause easier to see before the issue spreads. 🔍 Common Use Cases ▸ Reproduce customer reports without rebuilding every account from scratch. ▸ Review a feature flag before wider rollout, then note the exact result. ▸ Check region logic during localization work, pricing review, or partner QA. ▸ Compare staging and production behavior with fewer moving parts. ▸ Support demos where one controlled change proves the workflow. ▸ Teach newer teammates how request changes affect visible pages, so learning feels concrete. 🚦 Strong Release Support ⚡ The Mod Header Chrome extension is useful when release pressure is high and clarity matters. ⚡ Pair it with REST API testing tools for deeper service review. ⚡ Return to the browser to confirm the user-facing effect. ⚡ Keep discussion practical, with evidence close to the screen people already trust. 🌠 Built for Daily Development ✦ Use ModHeader Chrome for fast browser-side checks during active development. ✦ Bring a REST tool into the process when a service needs a direct call. ✦ Keep profiles for common projects, environments, or review patterns. ✦ Share short steps instead of long threads with unclear screenshots. ✦ Protect work habits by keeping changes focused, limited, and easy to remove. ✦ Help support teams speak from proof, not memory or guesswork. ✦ Give product reviewers a calmer way to verify launch details before meetings and share clear notes. 🛡️ Clear Context and Sensible Control ◆ ModHeader fits well beside API testing tools when a team needs both speed and context. ◆ It gives each user a clearer browser view while other utilities handle deeper checks. ◆ Security and privacy stay practical through focused habits. ◆ Keep changes limited, remove them after review, and avoid sharing more context than the task needs. You do not need a complex setup to start. Add ModHeader, create a small rule, refresh, and compare the page against the expected state. When the pattern is useful, keep it for later; when it is done, remove it, so personal sessions stay separate from work sessions. 🚀 Get Started with ModHeader * Use ModHeader when you want cleaner checks, sharper notes, and less friction between discovery and fix. * Add the ModHeader extension to your Chrome workflow for releases, demos, support reviews, and daily investigation. * Keep each check focused, so routine work does not become a long project. * Use it for fast triage and careful verification. * Help teams speak from the same facts.