validate-npm-package-license
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============================
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Give me a string and I'll tell you if it's a valid npm package license string.
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```javascript
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var valid = require('validate-npm-package-license');
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```
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SPDX license identifiers are valid license strings:
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```javascript
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var assert = require('assert');
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var validSPDXExpression = {
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validForNewPackages: true,
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validForOldPackages: true,
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spdx: true
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};
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assert.deepEqual(valid('MIT'), validSPDXExpression);
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assert.deepEqual(valid('BSD-2-Clause'), validSPDXExpression);
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assert.deepEqual(valid('Apache-2.0'), validSPDXExpression);
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assert.deepEqual(valid('ISC'), validSPDXExpression);
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```
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The function will return a warning and suggestion for nearly-correct license identifiers:
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```javascript
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assert.deepEqual(
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valid('Apache 2.0'),
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{
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validForOldPackages: false,
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validForNewPackages: false,
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warnings: [
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'license should be ' +
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'a valid SPDX license expression (without "LicenseRef"), ' +
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'"UNLICENSED", or ' +
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'"SEE LICENSE IN <filename>"',
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'license is similar to the valid expression "Apache-2.0"'
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]
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}
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);
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```
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SPDX expressions are valid, too ...
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```javascript
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// Simple SPDX license expression for dual licensing
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assert.deepEqual(
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valid('(GPL-3.0-only OR BSD-2-Clause)'),
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validSPDXExpression
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);
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```
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... except if they contain `LicenseRef`:
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```javascript
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var warningAboutLicenseRef = {
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validForOldPackages: false,
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validForNewPackages: false,
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spdx: true,
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warnings: [
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'license should be ' +
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'a valid SPDX license expression (without "LicenseRef"), ' +
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'"UNLICENSED", or ' +
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'"SEE LICENSE IN <filename>"',
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]
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};
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assert.deepEqual(
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valid('LicenseRef-Made-Up'),
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warningAboutLicenseRef
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);
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assert.deepEqual(
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valid('(MIT OR LicenseRef-Made-Up)'),
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warningAboutLicenseRef
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);
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```
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If you can't describe your licensing terms with standardized SPDX identifiers, put the terms in a file in the package and point users there:
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```javascript
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assert.deepEqual(
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valid('SEE LICENSE IN LICENSE.txt'),
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{
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validForNewPackages: true,
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validForOldPackages: true,
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inFile: 'LICENSE.txt'
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}
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);
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assert.deepEqual(
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valid('SEE LICENSE IN license.md'),
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{
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validForNewPackages: true,
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validForOldPackages: true,
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inFile: 'license.md'
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}
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);
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```
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If there aren't any licensing terms, use `UNLICENSED`:
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```javascript
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var unlicensed = {
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validForNewPackages: true,
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validForOldPackages: true,
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unlicensed: true
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};
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assert.deepEqual(valid('UNLICENSED'), unlicensed);
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assert.deepEqual(valid('UNLICENCED'), unlicensed);
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```
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