Circular.js

A small AMD, CommonJS, Global (window) compatible helper utility (usually called a replacer in JSON.stringify) to remove circular references for stringifying an object.

Usage

Using circular.js is pretty simple & straightforward, it provides you with several options to keep or discard keys from the object you're stringifying too.

stringified = JSON.stringify(obj, circular()); //the most basic usage option without any options or refs

With basic parameters you can pass into circular, the helper looks something like..

circular([ref [, options]]);

ref - default: "[circular Circular]"

ref is the reference name you want to assign your circular references.

stringified = JSON.stringify(obj, circular("[circular]")) //overrides [circular Circular] to [circular]

ref can also be a callback function which takes a single value parameter and processes the passed value even more..

stringified = JSON.stringify(obj, circular(function(v) {
    return "some_string_" + v;
}))

options

Circular provides you with various options to enable or disable few features, some of the most usable ones being able to keep or discard object's various keys

Options supported by circular include -

• stringifyFunctions : a boolean flag to specify whether you need to stringify values of type functions or discard them default: true
• keep : an array to specify only those keys that you want to keep in your final json output
• discard : an array to specify object's keys that you want to discard from your final json output

You have the flexibility to just pass in the options without overriding the default ref

stringified = JSON.stringify(obj, circular({ //without overriding ref
    stringifyFunctions: false,
    keep: ["Modernizr"]
}))

Or you can also override ref and pass in the options as the 2nd parameter

stringified = JSON.stringify(obj, circular("[circular]", { //with an alternative reference name
    stringifyFunctions: false,
    keep: ["Modernizr"]
}))

Feel free to report any bugs, or pull requests which can extend it with even more features