@magnet.me/site-diff

Site diff

Pull a web page, select a part based on a selector, and check whether it changed with respect to the previous hash.

To query without a previous hash: http://site-diff/changed?url=https%3A%2F%2Fmagnet.me%2F&selector=body

To query with a previous hash: http://site-diff/changed?url=https%3A%2F%2Fmagnet.me%2F&selector=body&hash=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Then return a json object so the caller can see whether it should take action.

{
  "hashes": {
     "previous": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
     "new": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
  },
  "changed": false,
  "empty": false,
  "found": "",
  "prerendered": true,
  "selector": "#currentPageInfo",
  "url": "https://magnet.me/sdfdsf"
}

Optionally pass in a PRERENDER_URL env var to ensure that the content is passed through a prerender service. That way any Javascript can be executed so dynamic pages can be crawled as well.