[Home](./index.md) > [@mike-north/devcert-patched](./devcert-patched.md) > [certificateFor](./devcert-patched.certificatefor_1.md) ## certificateFor() function Request an SSL certificate for the given app name signed by the devcert root certificate authority. If devcert has previously generated a certificate for that app name on this machine, it will reuse that certificate. If this is the first time devcert is being run on this machine, it will generate and attempt to install a root certificate authority. If `options.getCaBuffer` is true, return value will include the ca certificate data as { ca: Buffer } If `options.getCaPath` is true, return value will include the ca certificate path as { caPath: string } Signature: ```typescript export declare function certificateFor>(commonName: string, options?: O, partialCertOptions?: CO): Promise>; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | commonName | string | common name for certificate | | options | O | cert generation options | | partialCertOptions | CO | certificate options | Returns: `Promise>`