Convert double Quotes array "[]" to Pure Array object Node JS, BodyParser

Question

so here is the problem : I am passing a list/array of objects from front end to my node js back end.

This is how it looks on the front end : [{"sample1": "this", "apple2" : eat},{"sample2": "thisIs2", "apple3" : eatFruits}]

but when it is passed to the backend , its converted to String,something like this:
"[{"sample1": "this", "apple2" : eat},{"sample2": "thisIs2", "apple3" : eatFruits}]"

So when I run a for loop in my node js, the length is calculated as each characters. what do i do to get the pure array and the contents in the array. Thanks

Does this answer your question? [Converting a string to JSON object](https://stackoverflow.com/questions/10976897/converting-a-string-to-json-object) — lusc, Oct 26 '22 at 11:26
@ask4you Anytime I use that, it throws this error .. SyntaxError: Unexpected token t in JSON at position 2 — that_flutter_guy, Oct 26 '22 at 11:34
@lusc It didn't help. I tried already, I used JSON.parse, it throws this error ... SyntaxError: Unexpected token t in JSON at position 2 — that_flutter_guy, Oct 26 '22 at 11:36
Sounds like you're incorrectly stringifying it then. You'll need to debug how it's being sent. The string you've posted is indeed invalid due to missing quotes around the object values `eat` and `eatFruits`, but that could easily be a typo on your part — pilchard, Oct 26 '22 at 11:36
@pilchard here is what I'm doing.. var q = JSON.parse(req.body.toppings) console.log(typeof(req.body.toppings))---> the type shows String — that_flutter_guy, Oct 26 '22 at 11:38
but what about on the front end? How are you encoding it before sending. — pilchard, Oct 26 '22 at 11:40
@pilchard here is how it is sent from flutter... ``var newObject = { "topping": "${selectedItems[i].toppings['topping']}", "price": "${selectedItems[i].toppings['price']}", "quantity": "${selectedItems[i].quantity}" }; newMapToppingsAsList.add(newObject); print(newObject);`` — that_flutter_guy, Oct 26 '22 at 11:41
@pilchard i'm sending it as A multipart request in flutter. Is that right? — that_flutter_guy, Oct 26 '22 at 11:44
You need to appropriately stringify it see: [how to stringify json in flutter](https://stackoverflow.com/questions/54487659/how-to-stringify-json-in-flutter) — pilchard, Oct 26 '22 at 11:55
@that_flutter_guy Yea, i think because `eat` and `eatFruit` are functions/classes which can't be parsed or stringified with `JSON`. — ask4you, Oct 26 '22 at 12:16

score 0 · Answer 1 · answered Oct 26 '22 at 11:43

"[{"sample1": "this", "apple2" : eat},{"sample2": "thisIs2", "apple3" : eatFruits}]"
Your object is the "stringified" JSON. Means whole JSON object represented as string

e.g.

const jsonObj = [{"id": 1, "name": "John"}, {"id": 2, name: "Jane"}];
const strigified = JSON.stringify(jsonObj);
console.log(strigified);

output

'[{"id":1,"name":"John"},{"id":2,"name":"Jane"}]'

This can be reversed by parsing this string as JSON

const original = JSON.parse(strigified);
console.log(original);

output

[{"id": 1, "name": "John"}, {"id": 2, name: "Jane"}]

JSON.strigify() & JSON.parse() are exactly reciprocal methods...

Convert double Quotes array "[]" to Pure Array object Node JS, BodyParser

1 Answers1