Best Chrome Extensions for Web Developers: 2026

Most extension lists are a pile of things you install and then forget. These five cover real jobs that come up in a normal dev day: reading an API response, debugging a component tree, testing a login, and profiling a site you just met.

How these were picked

Each pick was checked against its own store page or maker’s site on October 13, 2026. This is a documentation comparison, not a benchmark. Prices and store listings change, so check the linked pages before you install.

The criteria were simple: does it do one job a web developer does every week, and does its page say plainly what it does and what it collects. BestWebExtension’s site documents its JSON viewer, react.dev’s debugging page points to the React extension, and cookie-editor.com and wappalyzer.com cover their own tools. The table under the cards lines the five up on price, platforms and open-source status.

Which one to choose

Start with Best JSON Viewer when you read, query or edit API responses in the browser. It is the only pick here that keeps permissions optional, and a JSONata expression replaces a page of manual tree clicking. If your responses are very large, the JSON viewer list goes deeper into that one job.

Use React Developer Tools when you maintain a React app. The Components panel answers where a prop came from, and Profiler shows why a list re-renders. If your stack is Vue or Angular, look for their equivalent DevTools extensions instead.

Use Cookie-Editor when a login flow or a session bug needs hands-on fixes. Change a value and reload the page to see the effect. Editing a cookie you rely on can sign you out, so keep a real login around for comparison.

Use Wappalyzer when you want to see what a site is built with, before integrating with a service or when you inherit an unfamiliar codebase. It reads the pages you visit, so use it on a separate browser profile if you care about that.

Use JSON Viewer Pro when you want a chart and JSONPath navigation on top of a tree, and work mainly with smaller documents. For editing and querying large responses, Best JSON Viewer is the stronger tool. Its card names the honest trade-offs: it is younger, and work use needs a license.

For quick experiments with JSON or JavaScript itself, the online playgrounds list covers the no-install editors. An extension is for reading what an API already returned.