# How to detect Keplr
Keplr API may be undefined right after the webpage shown. Please check the How to detect Keplr first before reading this section.
# Connecting with CosmJS
You can connect Keplr to CosmJS using the
To get the
OfflineSigner, you may use
window.getOfflineSigner is an alias that runs
keplr.getOfflineSigner and returns the value)
window.keplr.enable(chainId) method will request the user to unlock their Keplr extension if it's locked. If the user has not given permission to connect their extension to the website, it will first ask to connect the website.
If the user cancels the unlock or rejects the permission to connect, an error will be thrown.
If the extension is already unlocked and the website has permission to connect, no action will happen and resolve.
window.keplr.enable(chainId) is not mandatory. Even if the method wasn't called, if an API that requests access to Keplr is called the flow above will automatically run. However, it is recommended that
window.keplr.enable(chainId) is first run.
# Use with Stargate
OfflineSigner implements the
OfflineDirectSigner interface. Use
SigningStargateClient with Keplr's
OfflineSigner, and Keplr will sign the transaction in Proto sign doc format.
Refer to the keplr-example (opens new window) repository for example code on how to integrate Keplr with CosmJS.
# Adding a custom blockchain to Keplr
If Keplr doesn't natively support your blockchain within the extension, please refer to the Suggest chain section.