[SOLVED] responseBody does not contain a valid JSON in appwrite function

I am currently facing an issue after upgrading to 1.4.3 regarding the responseBody when returning JSON from the function.

So my Node.js function has the following lines:

TypeScript

      log(JSON.stringify(myContainers));
      return res.json(JSON.stringify(myContainers));

The appwrite log output show the following (as desired) value:

TypeScript

[{"_id":"649808696bca89048c8f0653","name":"Rombergstraße 118","label":"Weihnachtsdeko","uuid":"6a17cb1b-4215-4538-a2ae-0ef8a0af7fc8","location":"Unbekannt","description":"","tags":["test"],"owners":[{"username":"testuser@example.com","name":"Test User","userId":"649807cb6488dc8ff3c5"}],"readUsers":[],"rfid":""},{"_id":"649808696bca89048c8f0654","name":"Bethmannstraße 115","label":"Behälter 2","uuid":"e97b24c3-df68-45ef-a7dd-c830205cfae0","location":"Unbekannt","tags":["test"],"owners":[{"username":"testuser@example.com","name":"Test User","userId":"649807cb6488dc8ff3c5"}],"readUsers":[]}]

But the responseBody of the request, when using Postman returns:

TypeScript

"responseBody": "\"[{\\\"_id\\\":\\\"649808696bca89048c8f0653\\\",\\\"name\\\":\\\"Rombergstraße 118\\\",\\\"label\\\":\\\"Weihnachtsdeko\\\",\\\"uuid\\\":\\\"6a17cb1b-4215-4538-a2ae-0ef8a0af7fc8\\\",\\\"location\\\":\\\"Unbekannt\\\",\\\"description\\\":\\\"\\\",\\\"tags\\\":[\\\"test\\\"],\\\"owners\\\":[{\\\"username\\\":\\\"testuser@atic.ar\\\",\\\"name\\\":\\\"Test User\\\",\\\"userId\\\":\\\"649807cb6488dc8ff3c5\\\"}],\\\"readUsers\\\":[],\\\"rfid\\\":\\\"\\\"},{\\\"_id\\\":\\\"649808696bca89048c8f0654\\\",\\\"name\\\":\\\"Bethmannstraße 115\\\",\\\"label\\\":\\\"Behälter 2\\\",\\\"uuid\\\":\\\"e97b24c3-df68-45ef-a7dd-c830205cfae0\\\",\\\"location\\\":\\\"Unbekannt\\\",\\\"tags\\\":[\\\"test\\\"],\\\"owners\\\":[{\\\"username\\\":\\\"testuser@atic.ar\\\",\\\"name\\\":\\\"Test User\\\",\\\"userId\\\":\\\"649807cb6488dc8ff3c5\\\"}],\\\"readUsers\\\":[]}]\"",

The problem is: the response is surrounded with additional " which are escaped (\").

TL;DR

The issue is that the `responseBody` is surrounded by additional quotation marks that are escaped, causing the `jsonDecode` function in Flutter to interpret it as a string instead of a dynamic object. The solution is to change `return res.json(JSON.stringify(testObject));` to `return res.json(testObject);` in the TypeScript file.

The issue is, in my Flutter code the jsonDecode function interprets the value of the reponseBody as a string, instead of an dynamic object.

The value I have copied is directly from Postman to have a more RAW response and out rule package issues from Flutter.

So I created a minimum example:

TypeScript file

TypeScript

type Context = {
  req: any;
  res: any;
  log: (msg: any) => void;
  error: (msg: any) => void;
};

class TestModel {
  constructor(firstname: string, lastname: string){
    this.firstname = firstname;
    this.lastname = lastname;
  }
  firstname: string;
  lastname: string;
};

export default async ({ req, res, log, error }: Context) => {
  let testObject = new TestModel("John", "Doe");

  return res.json(JSON.stringify(testObject));
};

The responseBody is:

TypeScript

{
...
"responseBody": "\"{\\\"firstname\\\":\\\"John\\\",\\\"lastname\\\":\\\"Doe\\\"}\"",
...
}

Alright I think I understood the mistake. The res.json function changed in such a way, that the json.stringify() is done implicitly. So changing ...