Package License Viewer

English | 日本語

Shows the license of every dependency inline at the end of the line, with the license itself colored so it stands out at a glance.

// package.json
{
  "dependencies": {
    "lodash": "^4.17.21",        // MIT
    "@babel/core": "^7.0.0",     // MIT
    "left-pad": "1.3.0",         // WTFPL
    "axios": "^1.1.1"            // MIT (Node: >=20)
  },
  "devDependencies": {
    "typescript": "^5.7.2"       // Apache-2.0
  }
}

Hover an annotation to see the resolved version, where the information came from, and a link to the package homepage.

Supported languages

Language	Support	Package managers	Contributor	Notes
JavaScript / TypeScript	✅	npm, pnpm, yarn (classic & berry), bun	@otnc	`package.json`, plus `deno.json`/`jsr.json`/`import_map.json` and pnpm workspace catalogs
Deno / JSR	✅	jsr, `npm:` specifiers	@otnc	Same manifests as above — `jsr:` and `npm:` specifiers are both resolved
Rust	✅	Cargo	@bem130	`Cargo.toml` declarations resolved against crates.io / `Cargo.lock`; no local Cargo install needed
MoonBit	✅	moon	@Allianaab2m	`moon.mod` / `moon.mod.json` resolved against `.mooncakes`, the local registry index and mooncakes.io; no local `moon` install needed
Python	❌	pip, uv, poetry		Planned — [Issue #14](https://github.com/otnc/package-license-viewer/issues/14)
Ruby	❌	bundler, gem		Planned — [Issue #15](https://github.com/otnc/package-license-viewer/issues/15)
Go	❌	go mod		Planned — [Issue #16](https://github.com/otnc/package-license-viewer/issues/16)

See docs/resolution-details.md for exactly how each language resolves a license, per-package-manager notes, and known metadata gaps (e.g. JSR).

Editors

Editor	Support	Notes
VS Code	✅	The full feature set: inline annotations, hover, and every `packageLicenseViewer.*` setting.
Neovim	✅ (experimental)	Inline annotations, hover, and setting sync, via a bundled Node language server plus a Lua layer (`vim.lsp.start()`, `nvim_buf_set_extmark()`). The server currently has to be built locally (`npm run compile:lsp`, or a plugin manager's build hook) — see `:help package_license_viewer`.
Vim	✅ (experimental)	Same as Neovim, through the plugin's own VimScript LSP client (`job`/`channel` + `prop_add`/`popup_atcursor`). Needs Vim 9.0+ with `+job`, `+channel` and `+textprop` — see `:help package_license_viewer`.

The Vim/Neovim plugin lives at packages/vim-plugin; see its :help package_license_viewer for setup and configuration.

Commands

Command	Description
`Package License Viewer: Refresh License Annotations`	Re-read local metadata, lockfiles and Cargo workspace declarations, then redraw. Use after dependency changes.
`Package License Viewer: Clear License Cache`	Drop everything cached from the registries.
`Package License Viewer: Toggle Inline License Annotations`	Turn the annotations on or off.

Settings

Setting	Default	Description
`packageLicenseViewer.enabled`	`true`	Show inline license annotations.
`packageLicenseViewer.format`	`${license}`	Annotation template. Placeholders: `${license}`, `${version}`, `${name}`, `${source}`, `${nodeEngine}`.
`packageLicenseViewer.showResolvedVersion`	`false`	Append the resolved version, e.g. `MIT · 4.17.21`.
`packageLicenseViewer.showNodeEngine`	`true`	Append the package's `engines.node` range, when it has one, e.g. `MIT (Node: >=20)`.
`packageLicenseViewer.unknownText`	`""`	Text shown when the license is unknown. Empty means show nothing.
`packageLicenseViewer.annotationColor`	`editorCodeLens.foreground`	Theme color id, or a CSS color such as `#88888899`, for everything except the license itself.
`packageLicenseViewer.licenseColor`	`charts.green`	Theme color id, or a CSS color, used for just the license part of the annotation.
`packageLicenseViewer.margin`	`0 0 0 1.5em`	CSS margin before the annotation.
`packageLicenseViewer.cacheTtlHours`	`168`	Lifetime of cached registry results. `0` disables the on-disk cache.
`packageLicenseViewer.requestTimeoutMs`	`8000`	Timeout of a single registry request.
`packageLicenseViewer.maxConcurrentRequests`	`8`	Parallel registry requests.
`packageLicenseViewer.npm.enabled`	`true`	Enable annotations for `package.json`.
`packageLicenseViewer.npm.registry`	`https://registry.npmjs.org`	Registry base URL.
`packageLicenseViewer.npm.useRegistry`	`true`	Allow registry lookups. Set to `false` to stay fully offline.
`packageLicenseViewer.npm.useLockfiles`	`true`	Read lockfiles for exact pinned versions.
`packageLicenseViewer.npm.sections`	4 standard sections	Sections that are always annotated.
`packageLicenseViewer.npm.autoDetectSections`	`true`	Also annotate other top-level objects whose key ends with `dependencies`.
`packageLicenseViewer.npm.pnpmWorkspaceCatalogs`	`true`	Also annotate the `catalog:` and `catalogs:` sections of `pnpm-workspace.yaml`.
`packageLicenseViewer.jsr.enabled`	`true`	Enable annotations for Deno / import map manifests.
`packageLicenseViewer.jsr.registry`	`https://jsr.io`	JSR registry base URL.
`packageLicenseViewer.jsr.apiUrl`	`https://api.jsr.io`	JSR API base URL, where the license lives.
`packageLicenseViewer.crates.enabled`	`true`	Annotate dependency declarations in `Cargo.toml`.
`packageLicenseViewer.crates.useRegistry`	`true`	Allow crates.io requests. When disabled, existing cached public metadata can still be used.
`packageLicenseViewer.crates.useLockfiles`	`true`	Prefer a uniquely matching crates.io version in the applicable `Cargo.lock`.
`packageLicenseViewer.moonbit.enabled`	`true`	Annotate dependency declarations in `moon.mod` / `moon.mod.json`.
`packageLicenseViewer.moonbit.useRegistry`	`true`	Allow mooncakes.io requests. When disabled, installed modules, the local registry index and existing cached metadata are still used.
`packageLicenseViewer.moonbit.useRegistryIndex`	`true`	Read the registry index `moon update` keeps in `$MOON_HOME/registry/index`, so an installed toolchain resolves without any request.

Contributing

Adding a new ecosystem is one interface: LicenseProvider. See CONTRIBUTING.md for the architecture and contribution workflow.

Contributors

Author

otoneko. https://github.com/otnc

License

MIT

Package License Viewer

otoneko1102

Package License Viewer

Supported languages

Editors

Commands

Settings

Contributing

Contributors

Author

License