JSON

JSON Path Finder

https://jsonpathfinder.com/

JSON Diff

https://www.jsondiff.com/

JSON Valid check

https://jsonlint.com/

JSON Editor Online

http://jsoneditoronline.org/

Generate JSON Schema from JSON

jsonschema.net

$ npm install --save tv4

if (!tv4.validate(getState(), stateSchema)) {
  console.log('Invalid state schema detected');
}