Flog

What is IMG·2·JSON

IMG·2·JSON is a simple Google App Engine python application which extracts metadata from images and returns the results as a JSON string.

Live Demo

Run the demo — 640x480 Photo with EXIF data

How do I use it?

To use IMG·2·JSON all you need to do is perform a request for the fetcher-script URL hosted on Google App Engine.

Request Parameters

url

(required) The URL of the image

callback

A callback function string. This will wrap around the returned JSON, allowing you to execute callbacks when you receive the response

Response Parameters

url

The URL of the image this metadata belongs to

mimeType

The detected mime–type of the image

width

Width of the image in pixels

height

Height of the image in pixels

byteSize

The file size of the image in bytes

exif

Any EXIF metadata extracted from the image (such as Camera Manufacturer, Model, Orientation, Date, GPS position, etc)

Example Usage

Build up the request URL

The first step is to build up the request URL:
http://img2json.appspot.com/go/?callback=myCallbackMethod& ↵
  url=http://assets.flog.co.nz/favicon.png

In the URL above note the callback function set to "myCallbackMethod" and the URL set to "…favicon.png"

Request the URL and read the response

The result JSON returned by this request correctly identifies the images associated metadata and encloses the JSON object in the callback method:

myCallbackMethod({
	url: "http://assets.flog.co.nz/favicon.png",
	mimeType: "image/png",
	width: 16,
	height: 16,
	byteSize: 524,
	exif: {}
});

Credits

This application was written by Adam Burmister (www.flog.co.nz) in half an hour as a way to learn some Python and Google App Engine.