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16. JSON & BigInt Serialization

JSON.stringify, JSON.parse, and custom replacers.

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JSON does not support `BigInt` natively. Attempting to serialize a `bigint` throws a `TypeError`, requiring a replacer function or converting to string.

js
JSON.stringify({ value: 100n }, (k, v) => typeof v === "bigint" ? v.toString() : v);

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  1. 1. What happens when serializing a BigInt with standard JSON.stringify?

  2. 2. What happens to undefined values in an object during JSON.stringify?

  3. 3. Why should untrusted JSON.parse be wrapped in try/catch?

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