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resolve urls, links to a dat key





More info on active projects and modules at


resolve urls, links to a dat key using common methods

npm travis standard


  • Common dat key representations (dat://, etc.)
  • URLs with keys in them (
  • hyperdrive-key or dat-key headers
  • Url to JSON http request that returns {key: <dat-key>}
  • Dat-DNS resolution (via dat-dns)


npm install dat-link-resolve


var datResolve = require('dat-link-resolve')

datResolve(link, function (err, key) {
  console.log('found key', key)


datResolve(link, callback(err, key))

Link can be string or buffer.

Resolution order:

  1. Validate buffers or any strings with 64 character hashes in them via dat-encoding
  2. Check headers in http request
  3. Check JSON request response for key
  4. Dat-DNS resolution via dat-dns

Refering to dats

Trying to tighten up a bit dat-link-resolve (and its dependencies dat-dns and dat-decode). I am noticing a few inconsistencies as I'm writing dat-shell.

Ideally, I'd like to launch dat-shell like this:

$ dat-shell dat://40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9+5/path4

and have it open the dat at version 5 and change directory to /path4.

Currently dat-shell fails somewhere in dat-link-resolve.


Note that dat-link-resolve also supports other methods, such as detection of dat keys in paths and http headers.


  • Plain: 40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9
  • DNS:

With version

  • Plain: 40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9+5
  • DNS:

With scheme

  • https: https://40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9/
  • dat: dat://

With path

  • https: 40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9/path1
  • dat:


  • 40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9+5/path3
  • dat://40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9+5/path4
  • https://40a7f6b6147ae695bcbcff432f684c7bb5291ea339c28c1755896cdeb80bd2f9/path5 (^1)
  • (^2)


  1. browsers expect http and https schemes with traditional hostname, not a dat key
  2. browsers expect http and https schemes with traditional hostname, no +5 (version) support


Contributions welcome! Please read the contributing guidelines first.