JSON Serialization of numeric data types

It came to my attention that the website generates the same Base64 string for payloads containing numerical values written in different notations. An interesting example is the output for these two payloads:

{
  "value": 0.000001
}
{
  "value": 1.0e-6
}

Both yield: eyJ2YWx1ZSI6MC4wMDAwMDF9 Upon decoding, they both show: {"value":0.000001}

I am curious about where I can find more information regarding this behavior. I suspect that there might be a formal specification like an RFC or similar documentation. Any informal resources related to this topic would also be highly appreciated!

javascriptjsonfloating-pointjwt

Answer №1

Regardless of how a number is created and what notation is used for the number literal, the internal representation is always IEEE 754. This means that when serialization occurs, the values will be the same, resulting in the same output.

If you're interested in how numbers are serialized to a string, you can refer to the Spec. In short, the serialization depends on the number of significant digits.

console.log(1e-6 === .000001)

console.log(JSON.stringify(1e-6), 1e-6.toString())
console.log(JSON.stringify(1e-7), 1e-7.toString())

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