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

Latest Version

Version
5.0.25
Update
April 23, 2021
Size
1.8MiB
Developer
Category
Users
8,000+
Rating
4.36842 ★
Manifest Version
2
Web Store Status
Languages Support
English (United States)
See more
Permissions
Http://*/*
Https://*/*
See more

JaSON Extension

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:
Provides an IDE like experience when editing request body and headers. Automatically formats request/response body syntax and colour based on content type.

Content type:
Supports JSON, XML, and form encoded data by default. Additional content types can be used by setting a custom content type header.

New and improved:
Completely re-written, new styling, layout, colours, additional features and improved performance.

100% open source
Source code is available from GitHub.

Privacy policy
https://github.com/shanebell/JaSON/blob/master/privacy-policy.md
Read more

Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "name": "JaSON", "version": "5.0.25", "manifest_version": 2, "description": "A simple, easy to use HTTP client to send API requests from within Chrome and see formatted, syntax highlighted responses.", "background": { "scripts": ["background.js"], "persistent": false }, "browser_action": { "default_title": "JaSON", "default_icon": { "128": "jason-128x128.png", "256": "jason-256x256.png", "512": "jason-256x256.png" } }, "icons": { "128": "jason-128x128.png", "256": "jason-256x256.png", "512": "jason-256x256.png" }, "permissions": [ "http://*/*", "https://*/*" ]}
Read more

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User reviews

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Mark Pearson (ID: 000000961f493468) Voted 5 ★ - Updated 12/15/2022 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!

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Gilbert Lopah (ID: 0000005e10235855) Voted 5 ★ - Updated 09/09/2022 I honestly love this extension <3

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Semen Orlov (ID: 000000d618ddfe83) Voted 5 ★ - Updated 04/29/2022 Just doing what he has to do.

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Chan Go (ID: 0000000a8c1cfb8b) Voted 5 ★ - Updated 02/08/2018 Genial

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Developer C C (ID: 00000000d16b6f92) Voted 5 ★ - Updated 02/08/2018 Altamente recomendable