You can find the latest version of MetaMask on our official website. For help using MetaMask, visit our User Support Site.
For general questions, feature requests, or developer questions, visit our Community Forum.
MetaMask supports Firefox, Google Chrome, and Chromium-based browsers. We recommend using the latest available browser version.
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To learn how to develop MetaMask-compatible applications, visit our Developer Docs.
To learn how to contribute to the MetaMask project itself, visit our Internal Docs.
nvm use
will automatically choose the right node version for you.yarn setup
(not the usual install command).metamaskrc.dist
file to .metamaskrc
INFURA_PROJECT_ID
value with your own personal Infura Project ID.SEGMENT_WRITE_KEY
Segment write key, see Developing on MetaMask - Segment.SENTRY_DSN
Sentry Dsn, see Developing on MetaMask - Sentry.PASSWORD
value with your development wallet password to avoid entering it each time you open the app../dist/
folder with yarn dist
.
yarn start
to run dev mode.Uncompressed builds can be found in /dist
, compressed builds can be found in /builds
once they're built.
See the build system readme for build system usage information.
To start a development build (e.g. with logging and file watching) run yarn start
.
To start the React DevTools, run yarn devtools:react
with a development build installed in a browser. This will open in a separate window; no browser extension is required.
To start the Redux DevTools Extension:
remotedev-server
globally (e.g. yarn global add remotedev-server
)localhost
, port 8000
, secure connection checkbox unchecked).Then run the command yarn devtools:redux
with a development build installed in a browser. This will enable you to use the Redux DevTools extension to inspect MetaMask.
To create a development build and run both of these tools simultaneously, run yarn start:dev
.
This test site can be used to execute different user flows.
Run unit tests and the linter with yarn test
. To run just unit tests, run yarn test:unit
.
You can run the linter by itself with yarn lint
, and you can automatically fix some lint problems with yarn lint:fix
. You can also run these two commands just on your local changes to save time with yarn lint:changed
and yarn lint:changed:fix
respectively.
Our e2e test suite can be run on either Firefox or Chrome. In either case, start by creating a test build by running yarn build:test
.
Firefox e2e tests can be run with yarn test:e2e:firefox
.
Chrome e2e tests can be run with yarn test:e2e:chrome
. The chromedriver
package major version must match the major version of your local Chrome installation. If they don't match, update whichever is behind before running Chrome e2e tests.
Single e2e tests can be run with yarn test:e2e:single test/e2e/tests/TEST_NAME.spec.js
along with the options below.
--browser Set the browser used; either 'chrome' or 'firefox'.
--leave-running Leaves the browser running after a test fails, along with anything else
that the test used (ganache, the test dapp, etc.).
--retries Set how many times the test should be retried upon failure. Default is 0.
An example for running account-details
testcase with chrome and leaving the browser open would be:
yarn test:e2e:single test/e2e/tests/account-details.spec.js --browser=chrome --leave-running
Whenever you change dependencies (adding, removing, or updating, either in package.json
or yarn.lock
), there are various files that must be kept up-to-date.
yarn.lock
:
yarn setup
again after your changes to ensure yarn.lock
has been properly updated.yarn yarn-deduplicate
to remove duplicate dependencies from the lockfile.allow-scripts
configuration in package.json
yarn allow-scripts auto
to update the allow-scripts
configuration automatically. This config determines whether the package's install/postinstall scripts are allowed to run. Review each new package to determine whether the install script needs to run or not, testing if necessary.yarn allow-scripts auto
will behave inconsistently on different platforms. macOS and Windows users may see extraneous changes relating to optional dependencies.yarn lavamoat:auto
to update these files, but there can be devils in the details. Continue reading for more information.
lavamoat/browserify/*/policy.json
), which are re-generated using yarn lavamoat:background:auto
.
lavamoat/build-system/policy.json
), which is re-generated using yarn lavamoat:build:auto
.
yarn lavamoat:auto
will behave inconsistently on different platforms.
macOS and Windows users may see extraneous changes relating to optional dependencies.