[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Runtime](./puppeteer.protocol.runtime.md) > [UnserializableValue](./puppeteer.protocol.runtime.unserializablevalue.md) ## Protocol.Runtime.UnserializableValue type Primitive value which cannot be JSON-stringified. Includes values `-0`, `NaN`, `Infinity`, `-Infinity`, and bigint literals. Signature: ```typescript export type UnserializableValue = string; ```