[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Debugger](./puppeteer.protocol.debugger.md) > [DebugSymbols](./puppeteer.protocol.debugger.debugsymbols.md) > [externalURL](./puppeteer.protocol.debugger.debugsymbols.externalurl.md) ## Protocol.Debugger.DebugSymbols.externalURL property URL of the external symbol source. Signature: ```typescript externalURL?: string; ```