JaSON

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

What is JaSON?

"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.

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Extension stats

By: Shane Bell

View on Chrome Web Store

Users: 8,000+

Rating: 4.37 (38)

Version: 5.0.25 (Last updated: 2021-04-23)

Creation date: 2020-06-28

Risk impact: Moderate risk impact

Risk likelihood: Very low risk likelihood

Manifest version: 2

Permissions:

http://*/*
https://*/*

Size: 1.89M

Email: sh*****@gmail.com

URLs: Privacy policy

Ranking

# 11550 ▼ 21

Other rankings

#781 in Developer Tools ▼ 1

#86 in source code keyword 26 ▲ 4

#183 in performance keyword 12 ▼ 7

#190 in request keyword 20 ▲ 4

#206 in policy keyword 10 ▼ 4

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Other platforms

Not available on Firefox

Not available on Edge

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Extension summary

Analyze keywords

Great for testing and debugging JSON and XML APIs, RESTful APIs, GraphQL APIs, web services, web applications and more.

Cookie support: Automatically sends cookies from Chrome. This is extremely handy for APIs which require authentication. Simply authenticate via your browser as normal and JaSON will send cookies for requests which match.

HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS

Dark/light theme: Change the colour theme to suit your work environment.

Request history: Keeps request history with full text search. Individual history items can be deleted, or marked as a "favourite" for easy access. History from previous versions of JaSON will be automatically migrated. Stores history in IndexedDB for improved performance.

Formatted input/output:

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 Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.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

Recent reviews

Benny Meade, 2024-05-18

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!