JaSON

A simple, easy to use HTTP client to send API requests from within Chrome and see formatted, syntax highlighted responses.

JaSON: Easy-to-use HTTP Client Chrome Extension

"JaSON" is a free, open-source Chrome extension that acts as a simple HTTP client. It's perfect for testing and debugging a variety of APIs and web services. With automatic cookie support for handy authentication, a variety of HTTP methods, dark or light themes, and a history of previous requests, JaSON provides an easy, efficient experience. It also formats input/output and supports multiple content types, making it truly adaptable to a multitude of testing needs.
Install from Chrome Web Store

Extension stats

Manifest V2
Users: 7,000+
Rating: 4.37
(38)
Version: 5.0.25 (Last updated: 2021-04-23)
Creation date: 2020-06-28
Permissions:
  • http://*/*
  • https://*/*
Size: 1.89M
Full description: See detailed description

Other platforms

Not available on Android
Not available on Firefox
Not available on Edge

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Easy to use interface
  • Useful for testing API with JSON responses
  • Remembers previous requests
Cons
  • Doesn't work for some users
  • Could use more polish
  • Doesn't work for XML
  • Doesn't format JSON response in a readable way
Most mentioned
  • Useful for testing API with JSON responses
  • Easy to use interface
  • Doesn't work for some users
User reviews
This extension provided exactly what I was looking for - the ability to test an API which responds to HTTP POST requests with JSON responses. One feature I love is that it remembers previous requests which makes it very easy to fire off an earlier request again or change the JSON body of the request and then do the same. Excellent!
by Mark Pearson, 2022-12-15

I honestly love this extension <3
by Gilbert Lopah, 2022-09-09

Just doing what he has to do.
by Semen Orlov, 2022-04-29
View all user reviews

Extension safety

Risk impact

JaSON requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
  • Low ******* ****** ** *** ********* ********
Risk likelihood

We don't have sufficient data to confidently determine the risk likelihood of JaSON. Use it at your own risk.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* ********* ** * ******* ********* ** ****** *** *****
  • Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details

Promo images

JaSON small promo image
Small promo image

Similar extensions

Here are some Chrome extensions that are similar to JaSON: