[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Debugger](./puppeteer.protocol.debugger.md) > [EvaluateOnCallFrameRequest](./puppeteer.protocol.debugger.evaluateoncallframerequest.md) > [expression](./puppeteer.protocol.debugger.evaluateoncallframerequest.expression.md) ## Protocol.Debugger.EvaluateOnCallFrameRequest.expression property Expression to evaluate. Signature: ```typescript expression: string; ```