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JSON.stringify is a function in JavaScript that converts a value into a JSON string. It is a method of the JSON object in the ECMAScript standard.

The function takes a value as an argument and returns a string representation of that value in JSON format. JSON.stringify can convert a wide range of data types, including objects, arrays, and primitives like numbers and strings.

JSON.stringify can also take an optional second argument, which is a replacer function. This function is called for each property in the object being stringified, and it allows the object to be customized before it is converted to a JSON string. The replacer function can also return a different value for a property instead of the original property value.

Another optional argument that can be passed to JSON.stringify is a second argument, which is an array of strings. These strings represent properties that should not be stringified. For example, if you have a property named "_id" and you do not want it to be stringified, you can pass an array with that property name to the second argument.

JSON.stringify will also throw a SyntaxError exception if it is passed a value that cannot be stringified. A TypeError can also be thrown if the value being stringified is null or undefined.

JSON.stringify is often used when sending data over a network connection, such as in web applications or APIs. It ensures that data is sent in a format that is universally understood by all web browsers and programming languages that support JSON.