Postman

https://www.getpostman.com/

Postman on Chrome is the most efficient way to test, develop and document APIs. Create complex requests, go back in time and view results in a beautiful way. Postman has more than 80 features to help you at every step.

Postman helps you be extremely efficient while working with APIs.

With Postman, you can construct simple as well as complex requests quickly, save them for later use and analyze the response sent by the API. Postman can dramatically cut down the time required to test and develop APIs. Postman adapts itself for individual developers, small teams or big organizations equally well.

Features

Create requests quickly

• - Compact layout
• - HTTP requests with file upload support
• - Formatted API responses for JSON and XML
• - Open responses as an HTML file in a new window
• - HATEOAS support
• - Image previews
• - Request history
• - Basic and OAuth 1.0 helpers
• - Autocomplete for URL and header values
• - Key/value editors for adding parameters or header values. Works for URL parameters too.
• - Use environment variables to easily shift between settings. Great for testing production, staging or local setups.
• - Use Global variables for values which are common throughout APIs
• - Use the quick look feature to preview variables and their values before you use them
• - Keyboard shortcuts to maximize your productivity

Document and share APIs

• - Use collections to organize requests and share them quickly using URLs.
• - Document requests inside collections. You can even store entire HTML notes. Postman uses Bootstrap so you can use it too to style your notes.
• - Download and share collections with your team of developers.
• - Improved collection editing in 0.6.3

Collections

Collections can be any group of requests. You can save any kind of request by clicking the 'Add to collection' button. While saving the request you can also add a name and a note. There is no limit on the size of the notes so it can be as detailed as possible. Collections can be downloaded and shared as a file.

Oh also, Postman is open sourced under the Apache License 2.0. Feel free to contribute at https://github.com/a85/POSTMan-Chrome-Extension.

Note on permissions

The "Your data on all websites" permission is required to actually send a request to a domain. It's not used for anything else. It's not a new permission and Postman has required it since it was launched.