JaSON

4.5(

38 ratings

)

Extension Developer Tools4,000 users

Overview

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

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

4.5 out of 5
38 ratings
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Details

Version
5.1.0
Updated
July 2, 2026
Flag concern
Offered by
Shane Bell
Size
1.11MiB
Languages
English (United States)
Developer
Email
shane.bell@gmail.com
Non-trader
This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

JaSON has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.

JaSON handles the following:

User activity

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

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