Best API, JSON & HTTP tools Chrome extensions (2026)
The 20 most-used API, JSON & HTTP tools on the Chrome Web Store, ranked by real store users. Listings rated under 3 stars on 20+ ratings are left out. JSON viewers and formatters, REST/GraphQL clients, request builders, CORS unblockers, header modifiers, webhook and cURL helpers.
Top 20 API, JSON & HTTP tools, ranked
- 1
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
≈800K users3.4★ from 298 ratingsUpdated 3 months ago4 permissions - 2
XSLT Polyfill
Applies an XSLT polyfill to all XML documents.
≈90K users4.2★ from 10 ratingsUpdated 10 days agoNo special permissions - 3
Nextsense XML Signing Component
Signing XML document.
≈50K users4.8★ from 24 ratingsUpdated 3 months ago1 permissions - 4
User-Agent Switcher
Switch between popular useragent strings from toolbar popup!
≈30K users4.3★ from 106 ratingsUpdated 10 months ago4 permissions - 5
JSON Beautifier and Editor
Display JSON objects by transforming them into Syntax editable highlighted HTML to validate, format, and save
≈30K users4.8★ from 56 ratingsUpdated 7 weeks ago4 permissions - 6
Gooreplacer
A browser extension to block/redirect URLs and modify headers
≈10K users3.7★ from 24 ratingsUpdated 9 months ago6 permissions - 7
Former2 Helper
Helps avoid CORS issues with former2.com
≈10K users4.9★ from 7 ratingsUpdated 8 months ago6 permissions - 8
URL Blocker
Block URLs by RegEx blacklist
≈10K users4.0★ from 50 ratingsUpdated 14 months ago4 permissions - 9
XML Formatter
Format your XML so that it is indented correctly for easier reading.
≈10K users3.3★ from 7 ratingsNot updated for 3+ years3 permissions - 10
CodeBeautify
All Developer Friendly tools at your finger tips such as JSON Formatter, XML Viewer, SQL Formatter, Numbers to Words converters
≈10K users5.0★ from 16 ratingsNot updated for 3+ yearsNo special permissions - 11
Web Monitor
Tracking website updates, get instant alerts via notification, emails, webhook
≈10K users4.6★ from 107 ratingsUpdated 6 months ago8 permissions - 12
Gmail POP Sync
Fetch and synchronize your external POP accounts at the frequency you select.
≈10K users3.7★ from 42 ratingsUpdated 18 months ago4 permissions - 13
Share your Garmin Connect workout
Download and share your Garmin Connect workouts as JSON files. Import workouts shared by friends directly into your account.
≈10K users4.3★ from 73 ratingsUpdated 5 months ago3 permissions - 14
Descarga Masiva Facturas XML CFDI SAT México
Descarga masivamente los CFDI (XML y PDF) del SAT México
≈10K users4.8★ from 34 ratingsUpdated 3 months ago3 permissions - 15
Asin Grabber Light
Fetch Amazon Standard Identification Numbers (ASINs).
≈9K users3.4★ from 39 ratingsUpdated 5 months ago3 permissions - 16
XLSDEAL GSTR-N
Quick GSTR-N JSON data download/View/Update from the GST Portal || Developed by gst.xlsdeal.com
≈6K users5.0★ from 36 ratingsUpdated 9 months ago13 permissions - 17
XSwitch-v3
A tool for redirecting URLs and allowing CORS to make the local development experience easy and happy.
≈4K users5.0★ from 6 ratingsUpdated 5 weeks ago5 permissions - 18
白无常AI 图片提示词与生图助手
在网页图片上右键提取中英文提示词，并使用用户自备 API Key 生成参考图片。
≈4K users4.9★ from 18 ratingsUpdated 4 months ago3 permissions - 19
XSLT Browser Support - XSLT Polyfill, XML Viewer & Tester
An XSLT polyfill for Chrome: renders styled XML, RSS feeds and sitemaps, restores XSLTProcessor, plus an XML viewer and XSLT tester.
≈3K users5.0★ from 4 ratings5 permissions - 20
XML Manager: Descarga automática SRI
Extensión para automatizar la descarga de comprobantes electrónicos del SRI
≈3K users5.0★ from 264 ratingsUpdated 12 days ago6 permissions
API, JSON & HTTP tools: questions
What is the most popular API, JSON & HTTP tools Chrome extension?
Allow CORS: Access-Control-Allow-Origin is the most used, with ≈800K users and a 3.4-star rating. XSLT Polyfill is next with ≈90K users.
Which API, JSON & HTTP tools extension has the best rating?
Of the listings with 100+ ratings, XML Manager: Descarga automática SRI rates highest: 5.0 out of 5 from 264 ratings.
Are these API, JSON & HTTP tools still maintained?
2 of the 20 listed here were updated in the last 30 days. Each card shows how recently it was updated.