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# read-package-tree
[](https://travis-ci.org/npm/read-package-tree)
Read the contents of node_modules.
## USAGE
```javascript
var rpt = require ('read-package-tree')
rpt('/path/to/pkg/root', function (node, kidName) {
// optional filter function– if included, each package folder found is passed to
// it to see if it should be included in the final tree
// node is what we're adding children to
// kidName is the directory name of the module we're considering adding
// return true -> include, false -> skip
}, function (er, data) {
// er means that something didn't work.
// data is a structure like:
// {
// package:
// package.name: defaults to `basename(path)`
// children: [ ]
// parent:
// path:
// realpath:
// isLink:
// target:
// error:
// }
})
// or promise-style
rpt('/path/to/pkg/root').then(data => { ... })
```
That's it. It doesn't figure out if dependencies are met, it doesn't
mutate package.json data objects (beyond what
[read-package-json](http://npm.im/read-package-json) already does), it
doesn't limit its search to include/exclude `devDependencies`, or
anything else.
Just follows the links in the `node_modules` hierarchy and reads the
package.json files it finds therein.
## Symbolic Links
When there are symlinks to packages in the `node_modules` hierarchy, a
`Link` object will be created, with a `target` that is a `Node`
object.
For the most part, you can treat `Link` objects just the same as
`Node` objects. But if your tree-walking program needs to treat
symlinks differently from normal folders, then make sure to check the
object.
In a given `read-package-tree` run, a specific `path` will always
correspond to a single object, and a specific `realpath` will always
correspond to a single `Node` object. This means that you may not be
able to pass the resulting data object to `JSON.stringify`, because it
may contain cycles.
## Errors
Errors parsing or finding a package.json in node_modules will result in a
node with the error property set. We will still find deeper node_modules
if any exist. *Prior to `5.0.0` these aborted tree reading with an error
callback.*
Only a few classes of errors are fatal (result in an error callback):
* If the top level location is entirely missing, that will error.
* if `fs.realpath` returns an error for any path its trying to resolve.