This is the Ethereum JavaScript API which connects to the Generic JSON RPC spec.
You need to run a local or remote Ethereum node to use this library.
Please read the documentation for more.
npm install web3
yarn add web3
Note: works only in the Browser for now. (PR welcome).
meteor add ethereum:web3
Use the prebuild dist/web3.min.js
, or
build using the web3.js repository:
npm run-script build
Then include dist/web3.js
in your html file.
This will expose Web3
on the window object.
Or via jsDelivr CDN
<script src="https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js"></script>
UNPKG
<script src="https://unpkg.com/web3@latest/dist/web3.min.js"></script>
// in node.js
var Web3 = require('web3');
var web3 = new Web3('ws:https://localhost:8546');
console.log(web3);
> {
eth: ... ,
shh: ... ,
utils: ...,
...
}
Additionally you can set a provider using web3.setProvider()
(e.g. WebsocketProvider):
web3.setProvider('ws:https://localhost:8546');
// or
web3.setProvider(new Web3.providers.WebsocketProvider('ws:https://localhost:8546'));
There you go, now you can use it:
web3.eth.getAccounts().then(console.log);
We support types within the repo itself. Please open an issue here if you find any wrong types.
You can use web3.js
as follows:
import Web3 from 'web3';
const web3 = new Web3('ws:https://localhost:8546');
If you are using the types in a commonjs
module like for example a node app you just have to enable esModuleInterop
in your tsconfig
compile option, also enable allowSyntheticDefaultImports
for typesystem compatibility:
"compilerOptions": {
"allowSyntheticDefaultImports": true,
"esModuleInterop": true,
....
Documentation can be found at read the docs.
sudo apt-get update
sudo apt-get install nodejs
sudo apt-get install npm
Build only the web3.js package
npm run-script build
Or build all sub packages as well:
npm run-script build-all
This will put all the browser build files into the dist
folder.
npm test
The contribution guidelines are provided in CONTRIBUTIONS
- Python - Web3.py
- Haskell - hs-web3
- Java - web3j
- Scala - web3j-scala
- Purescript - purescript-web3
- PHP - web3.php