File formats: J
Every format whose extension starts with J.
Formats
| Format | Name | About | Main software | |
|---|---|---|---|---|
.JAR | Java archive | Java programs and libraries: class files and a manifest in a ZIP. | OpenJDK | DocumentedViewerEditorOpen |
.JAVA | Java source code | Java classes as text, compiled to .class files for the JVM. | IntelliJ IDEA | DocumentedViewerEditorOpen |
.JKS | Java KeyStore | Java’s older keystore: named keys and certificates, closed by a SHA-1 hash. | keytool | DocumentedViewerEditorOpen |
.JOURNAL | systemd journal | Linux’s binary system log: entries as indexed FIELD=value pairs. | journalctl | DocumentedViewerEditorOpen |
.JPG | JPEG image | Lossy compressed photographs, in marker segments with JFIF or Exif metadata. | Adobe Photoshop | DocumentedViewerEditorOpen |
.JS | JavaScript source code | Scripts and modules for browsers, Node.js and other runtimes. | Visual Studio Code | DocumentedViewerEditorOpen |
.JSON | npm package manifest (package.json) | A JavaScript package’s name, version, scripts and dependencies, in JSON. | npm | DocumentedViewerEditorOpen |
.JSON | Hugging Face model config | config.json: a model’s architecture and sizes, read before the weights. | Hugging Face Transformers | DocumentedViewerEditorOpen |
.JSON | Hugging Face tokenizer | tokenizer.json: a language model’s vocabulary and tokenising rules. | Hugging Face Transformers | DocumentedViewerEditorOpen |
.JSON | JavaScript Object Notation | Text format for objects, arrays, strings, numbers and booleans. | Visual Studio Code | DocumentedViewerEditorOpen |
.JSON | JSON Schema | A JSON document that describes and validates other JSON documents. | Visual Studio Code | DocumentedViewerEditorOpen |
.JSON | Lottie animation | Vector animations as JSON, exported from After Effects and played in apps and web pages. | Adobe After Effects | DocumentedViewerEditorOpen |
.JSON | Visual Studio Code settings | VS Code’s settings.json: dotted setting IDs in JSON with comments. | Visual Studio Code | DocumentedViewerEditorOpen |
.JSON5 | JSON5 | JSON with comments, trailing commas and unquoted keys, for hand editing. | Visual Studio Code | DocumentedViewerEditorOpen |
.JSONL | JSON Lines | One JSON value per line, so records can be streamed and appended. | Visual Studio Code | DocumentedViewerEditorOpen |
.JXL | JPEG XL | The JPEG committee's newer format: lossy or lossless, HDR, and lossless JPEG repacking. | GIMP | DocumentedViewerEditorOpen |