-bash: npm: command not found

/Users/XXX
└─┬ http-server@0.10.0
  ├── colors@1.0.3
  ├── corser@2.0.1
  ├─┬ ecstatic@2.2.1
  │ ├── he@1.1.1
  │ ├── mime@1.3.6
  │ ├── minimist@1.2.0
  │ └── url-join@2.0.2
  ├─┬ http-proxy@1.16.2
  │ ├── eventemitter3@1.2.0
  │ └── requires-port@1.0.0
  ├── opener@1.4.3
  ├─┬ optimist@0.6.1
  │ ├── minimist@0.0.10
  │ └── wordwrap@0.0.3
  ├─┬ portfinder@1.0.13
  │ ├── async@1.5.2
  │ ├─┬ debug@2.6.8
  │ │ └── ms@2.0.0
  │ └─┬ mkdirp@0.5.1
  │   └── minimist@0.0.8
  └─┬ union@0.4.6
    └── qs@2.3.3

npm WARN enoent ENOENT: no such file or directory, open '/Users/XXX/package.json'
npm WARN XXX No description
npm WARN XXX No repository field.
npm WARN XXX No README data
npm WARN XXX No license field.