[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Runtime](./puppeteer.protocol.runtime.md) > [GetHeapUsageResponse](./puppeteer.protocol.runtime.getheapusageresponse.md) > [usedSize](./puppeteer.protocol.runtime.getheapusageresponse.usedsize.md) ## Protocol.Runtime.GetHeapUsageResponse.usedSize property Used heap size in bytes. Signature: ```typescript usedSize: number; ```