Swarm-js NPM | npm.io

Disclaimer

This library isn't activelly maintained as I moved on to other things. If you'd like to maintain it, please let me know. For now, I think I can point to Erebos: https://erebos.js.org/

Swarm.js

This library allows you to interact with the Swarm network from JavaScript.

Getting started

Install
```
npm install swarm-js
```

Import

// Loads the Swarm API pointing to the official gateway
const swarm = require("swarm-js").at("http://swarm-gateways.net");

Examples

Uploads

With JSON:

Raw data:

const file = "test file"; // could also be an Uint8Array of binary data
swarm.upload(file).then(hash => {
  console.log("Uploaded file. Address:", hash);
})

Directory:

To upload a directory, just call swarm.upload(directory), where directory is an object mapping paths to entries, those containing a mime-type and the data (Uint8Array or UTF-8 String).

const dir = {
  "/foo.txt": {type: "text/plain", data: "file 0"},
  "/bar.txt": {type: "text/plain", data: "file 1"}
};
swarm.upload(dir).then(hash => {
  console.log("Uploaded directory. Address:", hash);
});

From disk:

On Node.js:

swarm.upload({
  path: "/path/to/thing",      // path to data / file / directory
  kind: "directory",           // could also be "file" or "data"
  defaultFile: "/index.html"}) // optional, and only for kind === "directory"
  .then(console.log)
  .catch(console.log);

On browsers:

// only works inside an event
document.onClick = function() {
  swarm.upload({pick: "file"}) // could also be "directory" or "data"
    .then(alert);
};

Downloads

With JSON:

Raw data:

const fileHash = "a5c10851ef054c268a2438f10a21f6efe3dc3dcdcc2ea0e6a1a7a38bf8c91e23";
swarm.download(fileHash).then(array => {
  console.log("Downloaded file:", swarm.toString(array));
});

Directory:

const dirHash = "7e980476df218c05ecfcb0a2ca73597193a34c5a9d6da84d54e295ecd8e0c641";
swarm.download(dirHash).then(dir => {
  console.log("Downloaded directory:");
  for (let path in dir) {
    console.log("-", path, ":", dir[path].data.toString());
  }
});

To disk:

On Node.js:

swarm.download("DAPP_HASH", "/target/dir")
  .then(path => console.log(`Downloaded DApp to ${path}.`))
  .catch(console.log);

On browser:
(Just link the Swarm URL.)

SwarmHash

console.log(swarm.hash("unicode string áéíóú λ"));
console.log(swarm.hash("0x41414141"));
console.log(swarm.hash([65, 65, 65, 65]));
console.log(swarm.hash(new Uint8Array([65, 65, 65, 65])));

For more examples, check out examples.