Packagejson

The following metadata fields can be extracted from a package.json file.
These fields are defined in the Package.json specification, currently at version 10.9.4, and are mapped according to the CodeMeta crosswalk for package.json.

Software metadata category	SOMEF metadata JSON path	PACKAGE.JSON metadata file field
authors - value	authors[i].result.value	author.name
authors - email	authors[i].result.email	author.email
authors - url	authors[i].result.url	author.url
authors - name	authors[i].result.name	author.name
code_repository	code_repository[i].result.value	repository/repository.url/repository.directory (1)
description	description[i].result.value	description
has_package_file	has_package_file[i].result.value	URL of the package.json file
homepage	homepage[i].result.value	homepage
issue_tracker	issue_tracker[i].result.value	bugs or bugs.url (2)
keywords	keywords[i].result.value	keywords
license	license[i].result.value	license or license.type (3)
package_id	package_id[i].result.value	name
requirements - value	requirements[i].result.value	dependencies/devDependencies name@sversion (4)
requirements - name	requirements[i].result.name	dependencies/devDependencies name (4)
requirements - version	requirements[i].result.version	dependencies/devDependencies version (4)
runtime_platform - value	runtime_platform[i].result.value	engines(package:version) -> version (5)
runtime_platform - name	runtime_platform[i].result.name engines(package:version) -> package (5)
version	version[i].result.value	version

---

(1)
- Example:

"repository": "npm/npm",

or

"repository": {
"type": "git",
"url": "git+https://github.com/npm/cli.git"
}

or 

"repository": {
"type": "git",
"directory": "workspaces/libnpmpublish"
}

(2)
- Example:

"bugs": {
"url": "https://github.com/npm/cli/issues"
}

or

"bugs": "https://github.com/npm/cli/issues"

(2)
- Example:

 "license": "Artistic-2.0"

 or

 "license" : {
    "type" : "ISC",
    "url" : "https://opensource.org/licenses/ISC"
  }
  ```
- Result: `Artistic-2.0" or "ISC" (license.type)`

*(3)*  
- Fist part of item -> name; second part --> version
- Example: 

"devDependencies": "foo": "1.0.0 - 2.9999.9999", ...

Resutl:
```{'result': {'value': 'foo@1.0.0 - 2.9999.9999', 'name': 'foo', 'version': '1.0.0 - 2.9999.9999', 'type': 'Software_application'}, 'confidence': 1, 'technique': 'code_parser', 'source': 'http://example.com/package_neors.json'}```

*(5)*  
- Example: 

"engines": { "node": ">=0.10.3 <15" } `` - Result:"name": "Node", "version": "">=0.10.3 <15"`