JSONFormatter.org - Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON

JSON Formatter & Validator - The JSON Formatter was created to help with debugging.

DevToys - A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.

JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.

BeautifyCode.net - This development tool gives you formatters, beautifiers, minifiers, validations, and converters for a technical person's daily task. You can convert xml to json, json and yaml, numbers to words and other data.

WTOOLS.io - Free Online Web Tools. Kit of tools such as generators, minifiers, formatters, checkers, converters, seo and much more