.JSON File Extension Reference
JSON is a structured text format built from objects, arrays, strings, numbers, booleans, and null. It is widely used for APIs, configuration, exports, and application data. Standard JSON requires double-quoted property names and does not allow comments or trailing commas, although many tools support non-standard JSON variants such as JSON5.
Quick Specification & Metadata
.JSON
Code & Data
application/json
Douglas Crockford
2001
Proprietary / Patent Licensed
Binary Header Data
2 KB – 10 MB
Online .JSON Viewer & Live Inspector
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What is a .JSON File? (Technical Definition & Architecture)
JSON is a structured text format built from objects, arrays, strings, numbers, booleans, and null. It is widely used for APIs, configuration, exports, and application data. Standard JSON requires double-quoted property names and does not allow comments or trailing commas, although many tools support non-standard JSON variants such as JSON5.
Formatted byte alignment adhering to international format specifications.
Adheres to formal schema and protocol documentation.
Parsed and executed identically across Windows, macOS, and Linux kernels.
JSON Binary Structure & Header Specifications
The .JSON format organizes data into validated sequential or hierarchical byte structures. Inspecting the header offset reveals the magic byte sequence 7B 22 (Text string: {" or [).
- File Signature (Magic Bytes): 7B 22 (Text string: {" or [)
- MIME Content-Type: application/json
- Payload Structure: Optimized data stream with metadata headers and checksum records.
- Safety Classification: Low Risk – Plain text structured data. Safe.
How to Open .JSON Files on Windows, Mac & Android
- 1Primary Application: Double-click or open directly with VS Code.
- 2Alternative Software: Open using Notepad++.
- 3File Association: Right-click the file, select Open with > Choose another app, and check Always use this app.
- 1Native macOS Application: Open with VS Code.
- 2Quick Look Preview: Highlight the file in Finder and tap the Spacebar.
- 3Set Default App: Press Cmd + I, expand Open with, select your application, and click Change All.
- 1Compatible Mobile Apps: Download a dedicated viewer for .json from the Google Play Store.
- 2Cloud Storage: Open through Google Drive, Dropbox, or OneDrive mobile apps.
- 3Online Browser Conversion: Use AnyFileX mobile browser tools to convert the file into universal PDF or image formats.
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.JSON MIME Types & HTTP Server Headers
When serving .json files over HTTP or configuring REST APIs, web servers must send the official IANA registered Content-Type headers:
| MIME Type Identifier | Standard Usage | File Extensions | Copy |
|---|---|---|---|
| application/json | Standard official MIME type for .json files | .json |
# Nginx mime.types
types {
application/json json;
}
# Apache .htaccess
AddType application/json .json.JSON Magic Bytes & Hex File Signatures
In digital forensics and file signature analysis, authentic .json files begin with a standardized magic byte sequence at byte offset 0x00 to verify file integrity and prevent extension spoofing:
Offset 0x007B 22 (Text stJSONCode & Data File Format.JSON vs .XML (Detailed Format Comparison)
| Feature Metric | .JSON | .XML | Advantage |
|---|---|---|---|
| Format Full Name | JavaScript Object Notation | XML File Format | Tie / Equal |
| Category | Code & Data | Code & Data | Tie / Equal |
| MIME Content-Type | application/json | application/xml | Tie / Equal |
| Binary Header (Magic Bytes) | 7B 22 (Text string: {" or [) | 3C 3F 78 6D 6C | Tie / Equal |
| Typical Storage Footprint | 2 KB – 10 MB | 500 KB - 25 MB | Tie / Equal |
| Universal Native Support | High / OS Standard | High / OS Standard | Tie / Equal |
.JSON Compatibility Matrix
Supported natively or through VS Code
Supported natively or via Notepad++
Supported via open-source tools and command line utilities
Accessible through compatible mobile viewers or cloud previewers
Supported through dedicated mobile apps or cloud viewers
Accessible via web browser applications and Chrome extensions
Recommended Software for .JSON
VS Code
Microsoft
Notepad++
Don Ho
Sublime Text
Sublime HQ
Common Errors & Troubleshooting .JSON Files
Security & Malware Risk Assessment
Can a .JSON file carry viruses or malware?
Plain text structured data. Safe.
No active macro execution support
Safe to inspect with AnyFileX's browser sandbox
- •Verify file extension in OS File Explorer options ('Show known file extensions').
- •Verify magic bytes (7B 22 (Text string: {" or [)) to ensure the file isn't a renamed executable.
- •Do not open .JSON attachments received unexpectedly via email or instant messenger.
Preguntas frecuentes
Respuestas claras a las preguntas más habituales.
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