How to use MetaMask to Deploy a Smart contract in Solidity (Blockchain)?

Smart contracts are self-executing contracts. They were first proposed by Nick Szabo in the 90s. They are set of rules and protocols which two parties agree upon and have to follow. One of the main features is that they are immutable once deployed on the blockchain. It is widely used in the Ethereum blockchain. The main language used for writing smart contracts in Solidity.

IDE

To write and execute solidity codes, the most common IDE used is an online IDE known as REMIX. You can either open it online on https://remix.ethereum.org/ or install it in your system from https://github.com/ethereum/remix-ide. You can also use Mist (the Ethereum DApp browser).  

After you write the code and compile it you can deploy it in 3 ways –

This article explains how to deploy your contract by using MetaMask as Injected Web3.

MetaMask 

MetaMask is a type of Ethereum wallet that bridges the gap between the user interfaces for Ethereum (e.g. Mist browsers, DApps) and the regular web (e.g. Chrome, Firefox, websites).



Its function is to inject a JavaScript library called web3.js into the namespace of each page your browser loads. Web3.js is written by the Ethereum core team. MetaMask is mainly used as a plugin in chrome. You can add it from here or download it directly from this link.

After adding MetaMask as an extension in chrome and creating an account, set up your account as follows –

Step 1: Select Ropsten Test Network from a list of available networks as below:

Select Test Network

Step 2: Request test ether form here.

Step 3: MetaMask is ready for deployment. To know more about MetaMask visit the MetaMask official guide.

Steps to deploy your contract

Step 1: Open Remix IDE in your browser. After opening click on + and write the filename as follows:

Create a contract



Step 2: Write the following sample code for testing and compile by clicking on the compile button as shown:

Solidity

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code

pragma solidity ^0.4.26;
  
// Creating a contract
contract shreyansh_05
{
  // Defining a function to
  // return a string
  function get_output() public pure returns (string) 
  {
      return ("Hi, your contract ran successfully");
  }
}

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Check output of the contract created

Step 3: After compilation and move to deploy section just below the compilation and select Injected Web3 in place of JavaScriptVM as shown below –

Select Injected Web3

Step 4: Now your contract is ready to be deployed. Click on deploy button and the MetaMask will ask for confirmation as follows –  

Metamask confirmation

Step 5: After confirmation, the deployed contract will look like –

Deploy code

Step 6: Expand the deployed contract as below and get the output using the get_output() function:

Output

Step 7: Now, to verify whether your transaction (process) executed successfully, you can check your balance on MetaMask.

Now your contract is completely ready to function. Make sure the compiler version matches the version of your solidity code. This is the basic implementation of MetaMask with solidity. 

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Never give up

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