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Best Developer Chrome Extensions (2026)

Developers live in the browser. These extensions cover debugging, formatting, testing and documentation without slowing you down.

Short answer

Web Developer is the classic toolbar for debugging. JSON Viewer formats API responses, and Copy as Markdown speeds up docs.

How we picked

  • • Saves real dev time
  • • Low overhead
  • • Reliable across sites
  • • Free or freemium
  • • Actively maintained

At a glance

#ExtensionBest forRatingUsersPricing
1Web DeveloperDebugging toolkit4.51M+
Free
2JSON FormatterAPI debugging4.32M+
Free
3Web ScraperData extraction4.1800K+
Freemium

Ratings and install counts are synced daily from each extension's Chrome Web Store listing.

  1. Web Developer Chrome extension logo

    1. Web Developer

    CSS, forms, images and cookie tools in one toolbar.

    Best for: Debugging toolkit

    4.5~1M+ users
    Free
    View ExtensionAlternativesStore
  2. JSON Formatter Chrome extension logo

    2. JSON Formatter

    Formats JSON responses so you can read and search them.

    Best for: API debugging

    4.3~2M+ users
    Free
    View ExtensionAlternativesStore
  3. Web Scraper Chrome extension logo

    3. Web Scraper

    Extract structured data from any page without code.

    Best for: Data extraction

    4.1~800K+ users
    Freemium
    View ExtensionAlternativesStore

What to know before choosing

A JSON formatter and a screenshot tool cover most daily debugging needs; add a scraper when you work with data.

Keep dev extensions minimal — every content script runs on every page you open.

Compare the shortlist head-to-head

Narrowed it to two? These side-by-side comparisons settle it with a feature table and a verdict.

Wappalyzer vs JSON FormatterStack detection for recon work against readable API responses in the browser.React Developer Tools vs JSON FormatterBoth are developer tools extensions people shortlist together — see how ratings, install base, pricing and day-to-day use differ.All comparisonsThe full compare hub, grouped by category.

Alternatives to the top picks

Web Developer alternativesClosest replacements for Web Developer, ranked by fit.JSON Formatter alternativesClosest replacements for JSON Formatter, ranked by fit.Web Scraper alternativesClosest replacements for Web Scraper, ranked by fit.

Frequently asked questions

What Chrome extensions do developers need?

JSON Formatter, Web Developer and a screenshot tool are the core three.