3. How to Connect to Solana Web3JS

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1.) Add @solana/web3.js to your project:
2.yarn add @solana/web3.js OR npm install --save @solana/web3js
3.Include library in your files: const solanaWeb3 = require('@solana/web3.js');
4.) Add RunNode connection string
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var connection = new solanaWeb3.Connection(
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   'https://connect.runnode.com/?apikey=<API KEY GOES HERE>',
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   'confirmed',
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);
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if (connection) {
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    console.log('connected to RunNode successfully')
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}
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3. ) Make calls like you normally would:

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let block = await connection.getBlock(slot);
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console.log(block);
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