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140 lines
4.5 KiB
Markdown
140 lines
4.5 KiB
Markdown
---
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title: React App Setup
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description: This tutorial shows how you can build a basic [React](https://reactjs.org/) app with [Create React App](https://github.com/facebook/create-react-app) that uses the squid-js JavaScript package to publish a data set, get a data set, and more.
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---
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## Requirements
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- `Node.js` >= 10 is installed. You can check using `node -v`
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- `npm` >= 5.2 is installed. You can check using `npm -v`
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- Do the tutorial to [Set Up Azure Storage](/tutorials/azure-for-brizo/).
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- Use a browser with [MetaMask](https://metamask.io/) and some Ether in your account. See the tutorial about [getting Ether and Ocean Tokens for testnets](/tutorials/get-ether-and-ocean-tokens/).
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- Git clone the [oceanprotocol/barge](https://github.com/oceanprotocol/barge) repository, then in that directory:
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- Edit the `brizo.env` file and set all `AZURE_`... values.
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- Run `./start_ocean.sh --no-pleuston --local-kovan-node`. This runs several Ocean services locally, including a local Parity Ethereum node connected to the Kovan Testnet.
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## New Create React App
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First, kick start your new React app by creating a boilerplate with Create React App:
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```bash
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npx create-react-app marketplace
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```
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This will create a folder named `marketplace` with a boilerplate React app. Go into that new folder and add the Ocean Protocol JavaScript library and Web3 packages to the app's dependencies:
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```bash
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cd marketplace/
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npm install @oceanprotocol/squid web3
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```
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At this point you can already run `npm start` which starts the app in your browser at [localhost:3000](http://localhost:3000):
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## Add Markup & Web3
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Let's make it ours, open `src/App.js` and replace the whole source with:
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```jsx
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import React, { Component } from 'react'
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import './App.css'
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class App extends Component {
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render() {
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return (
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<div className="App App-header">
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<h1>Marketplace app</h1>
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</div>
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)
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}
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}
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export default App
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```
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Below the `import './App.css'` line, let's import the packages we installed, set up web3 and unlock MetaMask accounts (if locked):
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```js
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import { Ocean } from '@oceanprotocol/squid'
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import * as Web3 from 'web3'
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const web3 = new Web3(window.web3.currentProvider)
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window.ethereum.enable()
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```
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After those steps you should see this, and MetaMask should have asked you to allow access to your account:
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## Create Ocean instance
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Now that we are successfully connected with Web3, we can setup our Ocean instance.
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At the beginning of your component, create a new Ocean instance with all configuration within the `componentDidMount` lifecycle method. All Ocean Protocol operations can be executed from this Ocean instance.
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```js
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async componentDidMount() {
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this.ocean = await new Ocean.getInstance({
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web3Provider: web3,
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nodeUri: "http://localhost:8545",
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aquariusUri: "http://localhost:5000",
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brizoUri: "http://localhost:8030",
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parityUri: "http://localhost:8545",
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secretStoreUri: "http://localhost:12001",
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threshold: 0,
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password: "node0",
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address: "0x00bd138abd70e2f00903268f3db08f2d25677c9e",
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})
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console.log("Finished loading contracts!")
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}
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```
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## Final Result
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That's it, if you have no errors in your `console.log` then you have successfully initialized an Ocean instance in your brand new React app and you are ready for the [next part of this tutorial](/tutorials/react-publish-data-set/).
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Here is the full source of `src/App.js` that you should have if you followed this tutorial:
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```jsx
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import React, { Component } from 'react'
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import './App.css'
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import { Ocean } from '@oceanprotocol/squid'
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import * as Web3 from 'web3'
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const web3 = new Web3(window.web3.currentProvider)
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window.ethereum.enable()
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class App extends Component {
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async componentDidMount() {
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this.ocean = await new Ocean.getInstance({
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web3Provider: web3,
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nodeUri: 'http://localhost:8545',
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aquariusUri: 'http://localhost:5000',
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brizoUri: 'http://localhost:8030',
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parityUri: 'http://localhost:8545',
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secretStoreUri: 'http://localhost:12001',
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threshold: 0,
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password: 'node0',
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address: '0x00bd138abd70e2f00903268f3db08f2d25677c9e'
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})
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console.log('Finished loading contracts!')
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}
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render() {
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return (
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<div className="App App-header">
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<h1>Marketplace app</h1>
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</div>
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)
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}
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}
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export default App
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```
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Move on to [Publish a Data Set](/tutorials/react-publish-data-set/).
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