[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [WebAuthn](./puppeteer.protocol.webauthn.md) > [Credential](./puppeteer.protocol.webauthn.credential.md) > [privateKey](./puppeteer.protocol.webauthn.credential.privatekey.md) ## Protocol.WebAuthn.Credential.privateKey property The ECDSA P-256 private key in PKCS\#8 format. Signature: ```typescript privateKey: string; ```