(Formerly Solium) Linter to identify and fix style & security issues in Solidity
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Solium analyzes your Solidity code for style & security issues and fixes them.

Standardize Smart Contract practices across your organisation. Integrate with your build system. Deploy with confidence!


npm install -g solium
solium -V


In the root directory of your DApp:

solium --init

This creates 2 files for you:

  • .soliumignore - contains names of files and directories to ignore while linting
  • .soliumrc.json - contains configuration that tells Solium how to lint your project. You should modify this file to configure rules, plugins and sharable configs.

.soliumrc.json looks like:

  "extends": "solium:recommended",
  "plugins": ["security"],
  "rules": {
    "quotes": ["error", "double"],
    "indentation": ["error", 4]

To know which lint rules Solium applies for you, see Style rules and Security rules.


Solium does not strictly adhere to Solidity Style Guide. It aims to promote coding practices agreed upon by the community at large.


solium -f foobar.sol
solium -d contracts/

Configure with comments

Comment Directives can be used to configure Solium to ignore specific pieces of code. They follow the pattern solium-disable<optional suffix>.

If you only use the directive, Solium disables all rules for the marked code. If that's not desirable, specify the rules to disable after the directive, separated by comma.

  • Disable linting on a specific line
contract Foo {
	/* solium-disable-next-line */
	function() {
		bytes32 bar = 'Hello world';	// solium-disable-line quotes

		// solium-disable-next-line security/no-throw, indentation
  • Disable linting on entire file
/* solium-disable */

contract Foo {


Solium automatically fixes your code to resolve whatever issues it can.

solium -d contracts/ --fix

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