Cannot stringify arbitrary non-pojos

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The error “Cannot stringify arbitrary non-POJOs” occurs when trying to convert a non-plain old JavaScript object (POJO) into a JSON string using the JSON.stringify() method. The JSON.stringify() method converts a JavaScript object into a JSON string representation.

JSON.stringify() can only convert objects that have properties with primitive data types such as string, number, boolean, null, or an array containing these primitive types. It cannot convert objects with functions, symbols, or properties that reference other objects.

Here is an example that demonstrates the error: 

    
var obj = {
  name: "John",
  age: 30,
  func: function() {
    console.log("This is a function.");
  }
};

var jsonString = JSON.stringify(obj); // Throws "TypeError: Cannot stringify arbitrary non-POJOs"

In the above example, the object “obj” has a property called “func” which is a function. When we try to stringify the object using JSON.stringify(), it will throw the “TypeError: Cannot stringify arbitrary non-POJOs” error because functions cannot be converted to JSON.

To fix this error, make sure all the properties of the object are JSON-serializable. Remove any functions or non-JSON compatible properties before using JSON.stringify() to convert the object into a JSON string.

Here is an updated example without the non-serializable property: 

    
var obj = {
  name: "John",
  age: 30
};

var jsonString = JSON.stringify(obj); // No error, jsonString will be "{"name":"John","age":30}"

In the above updated example, the “func” property has been removed, and now the object can be successfully converted into a JSON string without any errors.

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