The perfect JSON validation and formatting tool would be fast, simple, intuitive, and beautiful. This is exactly what JSON checker aims to be. JSON checker allows users to input their JSON and quickly check for malformed JSON, fix the issue, and beautify the JSON into a more readable format. When you copy paste your JSON the built-in JSON formatter will autoformat/beautify valid JSON. If your JSON is invalid, we provide clear and concise error messages pointing to a specific line number for you to validate and fix. The tool provides JSON syntax highlighting, to help with readability.