.json — JavaScript Object Notation
Douglas Crockford · 2001
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that has become the standard for web APIs and configuration files.
Key Features
- Plain text storage behavior for typical code workflows
- Common MIME type: application/json
- Recognizable file signature: Plain text, starts with { or [
- Associated with Douglas Crockford
Best For
- Developer workflows
- Version-controlled projects
- Readable plain-text editing
Less Ideal For
- Rich visual layouts
- Binary asset storage
- Non-technical end-user exchange
Common Use Cases
- Writing source code
- Configuring apps and tools
- Automating workflows or scripting
How to Open It
- On Windows, open the file with VS Code or Notepad++.
- On macOS, open the file with VS Code or TextEdit.
- If the file does not open, confirm that the extension really matches .json and that the download or transfer completed without corruption.
What is a .json file?
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that has become the standard for web APIs and configuration files. JSON uses human-readable key-value pairs and arrays, making it easy to parse by both humans and machines. It has largely replaced XML for data exchange due to its simplicity and smaller file sizes. JSON is supported by virtually every programming language and is essential for modern web development.
Programs That Open .json Files
| Platform | Program | ||
|---|---|---|---|
| Windows | VS Code | Free | |
| Notepad++ | Free | ||
| Any text editor | Free | ||
| macOS | VS Code | Free | |
| TextEdit | Free |
Common Problems with .json Files
Frequently Asked Questions
.json files can be opened with several programs. VS Code is one of the most popular choices.
Generally yes, .json files are safe to open with appropriate software.
Yes, there are many online and offline tools available to convert .json files. Check the conversion section above for specific methods.
Technical Details
JavaScript Object Notation files use the application/json MIME type and were first introduced in 2001 by Douglas Crockford. The file can be identified by its signature: Plain text, starts with { or [.