What is a JSON file?
The .JSON file extension stands for a JavaScript Object Notation File. Originally specified by Douglas Crockford, JSON is a lightweight, text-based data interchange format. Developers and software systems use .JSON files to transmit data between a server and a web application, or to store application configuration settings. The format is standardized under ECMA-404 and RFC 8259, typically encoding data using standard UTF-8 characters.
How to open JSON files?
Because .JSON files contain plain text, you can open them with basic text editors like Notepad on Windows or TextEdit on macOS. However, reading raw data strings can be difficult. Specialized code editors like Visual Studio Code, Sublime Text, or Notepad++ provide syntax highlighting, bracket matching, and code formatting. This makes the structured data much easier to read and edit.
Software and tools
Many command-line tools can format and inspect .JSON files. A popular open-source tool is jq, which allows users to parse, filter, and extract specific data streams directly from the terminal. Web browsers like Google Chrome or Mozilla Firefox also include built-in JSON viewers to display nicely formatted output when you open local files or web API links. If you need to transform a .JSON file into other structural formats like .XML, .YAML, or .CSV, you can easily convert them using convert.guru.
Best practices and troubleshooting
A common issue with .JSON files is invalid syntax. A single missing comma, an unescaped character, or a trailing comma will break the file and stop software from reading it. You can use online validators or linting tools inside your code editor to find syntax errors quickly. To inspect an unknown file safely, viewer.online/json analyzes .JSON files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Summary
Because .JSON files use the well-known JSON text format, viewer.online/json can safely open and display them online, eliminating compatibility problems entirely.