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It looks like JSON does not parse into an actual type. Is this normal and expected behaviour for JSON.parse?

let parseBuf = JSON.parse('{"type":"Buffer","data":[146,247,204,173,154,172,70,6,147,130,219,222,4,69,161,74]}');
let bufferBuf = Buffer.from(parseBuf.data);

console.log(parseBuf instanceof Buffer)
console.log(bufferBuf instanceof Buffer)

console.log(JSON.stringify(parseBuf))
console.log(JSON.stringify(bufferBuf))

Results from the console log is

false
true
{"type":"Buffer","data":[146,247,204,173,154,172,70,6,147,130,219,222,4,69,161,74]}
{"type":"Buffer","data":[146,247,204,173,154,172,70,6,147,130,219,222,4,69,161,74]}
Improve this question
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  • 2
    Yes, that's normal and expected behavior. JSON.parse returns a JS value or object. A Buffer is not a JS value or object, it's a Node-specific object. Commented Jan 19, 2023 at 2:52
  • 1
    Yes, that's as expected. You have to turn the JavaScript object that JSON.parse produces (the one that looks like {"type": "Buffer", "data":[...]} into a Buffer with Buffer.from as you did in the second line of your example. JSON knows very few types: string, number, array, object, boolean, null. Notoriously unsupported are: Buffer, Date, function, and undefined. Consider reading Convert a JSON Object to Buffer and Buffer to JSON Object back Commented Jan 19, 2023 at 2:55
  • Tbh it's rather unnormal/unexpected that JSON.stringify(buffer) creates "type": "Buffer" in the output. Commented Jan 19, 2023 at 2:59
  • See stackoverflow.com/questions/5873624/…, stackoverflow.com/questions/52315147/json-to-javascript-class and stackoverflow.com/questions/12975430/… Commented Jan 19, 2023 at 3:01
  • @Wyck The link you found does the inverse, roundtrip an object (via JSON) through a buffer, not roundtrip a buffer through JSON Commented Jan 19, 2023 at 3:06
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