Client certificates are used by some APIs to as a means of authentication. Insomnia supports assigning a client certificate to a specific domain name and will automatically use them automatically whenever a request to that domain is sent.
PFX (Mac) and
PEM (Windows and Linux) certificates.
To import a new certificate, click Document Settings or Collection Settings then the Client Certificates tab.
Depending on whether you are working with a Document or Collection, access client certificate settings via Document Settings or Collection Settings.
Once you click New Certificate in the Client Certificates tab, you will be prompted to fill out the following information.
Host: certificate will be sent when the host (and port if specified) matches
PFX: certificate in
PKCS12 format (only supported on Mac)
CRT File + Key File: certificate and key pair (only supported on Windows and Linux)
Passphrase: An optional passphrase for the certificate, if required
After importing a certificate, it will show up in the main certificates list in the Client Certificates tab. From here, the certificate can be enabled, disabled, or deleted.