Truffle integration with MythX

MythX for Truffle is a Truffle plugin that adds automated smart contract security analysis to the Truffle framework. With this plugin, you can run security analysis directly from your Truffle development environment.

The MythX plugin requires Truffle 5.0 or higher. Note that your Truffle project must compile successfully for the security analysis to work.


You can install the plugin on a per-project basis or globally.


Windows users need to install the following dependencies:

Both will need to be installed with Administrator privileges.

In addition, those using Windows PowerShell may need to set the Execution Policy to Unrestricted in order to install the Windows Build Tools package:

Set-ExecutionPolicy Unrestricted

This will also need to be run with Administrator privileges.

Individual project

Install the plugin on an individual Truffle project by running the following inside the root of your Truffle project:

npm install truffle-security

The plugin will install for that Truffle project only. In addition, the plugin will edit the project’s configuration file (truffle-config.js) to add the necessary plugin configuration. You do not need to edit this file.


If you have existing plugins activated for the project, they will not be affected.

Global installation

Install the plugin globally so that it is accessible to all projects:

npm install -g truffle-security

If you install MythX for Truffle in this manner, you will in addition need to edit each project’s configuration file (truffle-config.js) to add the necessary plugin:

module.exports = {

  // ...

    plugins: [ "truffle-security" ],

  // ...



You need to sign up for a MythX account in order to use the MythX plugin for Truffle. Your account, once verified, is on the Free plan.


MythX offers both free and paid plans. For information on plans and features, please see our Pricing page. Truffle will pick up your account information when stored in your system’s environment variables.

MythX uses an API key for authentication. This API key can be generated in your dashboard. In the Profile tab there is a section titled MythX API Key. Generate a new API key by entering your account password:


On successful authentication, a new API key is generated, which can be used for further authentication by API clients. It will only be shown once, and can be copied using the icon on the right of the truncated secret string. If the token is lost, a new one can be generated again in the same way as explained above.


This key can be passed to MythX as an environment variable MYTHX_API_KEY.

  • Linux / macOS:

    export MYTHX_API_KEY='put your API key here!'
  • Windows:

    set MYTHX_API_KEY='put your API key here!'

They API key can also be passed as a command line argument using --apiKey flag:

--apiKey {'put your API key here'}


Authentication via Ethereum address or user name and password is deprecated.


Analyzing an entire project

To run MythX for Truffle, run the following command in the root of your configured Truffle project:

truffle run verify


The project must compile successfully in order for the plugin to run. If the project hasn’t been compiled yet, MythX for Truffle will try to compile it first.

Analyzing whole contract files

By default, all contracts in all contract files in the project will be analyzed. To analyze only a single contract file, use the following syntax:

truffle run verify contract.sol

This will analyze all the contracts found in the file contract.sol.

Multiple contract files can be specified here as well:

truffle run verify contract1.sol contract2.sol

All contracts inside both contract1.sol and contract2.sol will be analyzed.

Analyzing specific contracts

You can also analyze a specific contract:

truffle run verify contract.sol:MyContract

This will analyze the contract named MyContract found in the file contract.sol.

Multiple contracts can be specified here too. For example:

truffle run verify contract1.sol:MyContract1 contract2.sol:MyContract2

This will analyze both MyContract1 and MyContract2, which are found in the contract1.sol and contract2.sol files respectively.


The following syntax has been deprecated and should not be used:

truffle run verify MyContract


To see the various command options available to you, run the following:

truffle run verify --help

You can pass options to the tool in two ways:

  • Command line options (--option)
  • Configuration file (truffle-security.json)

Command line options take precedence over any options specified in the configuration file.

Command line options


Compile all contracts. Without this, only the contracts changed since last compile will be recompiled.

--apiKey {api key generated from profile dashboard}

Authenticate with api key instead of login details.


Blocking non zero return for CI integrations to throw an error (non-zero exit code).

--ci-whitelist { 101 | 103,111,115 | ... }

List of allowed SWCs that will not throw an error (non-zero exit code).


Provide additional debug output. Use --debug=2 for more verbose output. Implies --no-progress.

--initial-delay <N>

Minimum amount of time (in seconds) to wait before attempting a first status poll. Default is 45 seconds. Read more about improving polling response.


Output results in unprocessed JSON format. Differs from --style=json which provides an es-lint compatible output format. See also --yaml.

--limit <N>

Limit the number of parallel analysis requests to no more than <N>. As results come back, remaining contracts are submitted. The default and mamximum is 4, but this can be set lower.

--min-severity <LEVEL>

Ignore SWCs below the designated severity level. Options are warning or error.


Currently, the only severity levels are warning and error, so choosing warning here has no effect (ignores nothing). Future versions may add support for an info severity level, which would be ignored.

--mode <MODE>

Perform quick, standard, or deep analysis. Refer to the plans page to see details about the different scan types. Note that not every scan type is available with every plan.

--mythx-logs --no-mythx-logs

Enable/disable MythX logs.


Disable output coloring.


Disable progress bars during analysis.

--style <STYLE>

Output the report in the given es-lint style. Options include stylish, json, table, tap, unix, and markdown.

--swc-blacklist <LIST>

Ignore a specific SWC or list of SWCs. Use the number only (107 instead of SWC-107). If using a list, use commas and no spaces to separate the SWCs (103,111,115).

--timeout <N>

Limit MythX analyses time to <N> seconds. The default is 300 seconds.

--uuid <UUID>

(Experimental) Display results from a prior analysis with the given UUID. Result is in YAML.


Show package and MythX version information.


Output results in unprocessed YAML format. Differs from --style=yaml which provides an es-lint compatible output format. See also --json.

Configuration file

In addition to command line options, you can specify a configuration file named truffle-security.json. Placed in the root of the project, this file can contain a list of options and values. Every option available on the command line is available here.

An example format of this file is as follows:

  "style": "table",
  "mode": "quick",
  "min-severity": "warning",
  "swc-blacklist": [103,111]

For arguments that don’t take a value (such as no-progress) use the format:

  "no-format": true

For arguments that take a list (such as swc-blacklist), brackets for the values are optional.


Command line options take precedence over any options specified in the configuration file.