Working with global npm install but not with npm run

[msteel9999]

If I install better-npm-audit globally ie
npm install -g better-npm-audit

Then it works but if I install via package.json and add a script as:
"audit": "better-npm-audit audit"

Then I get this error:
'better-npm-audit' is not recognized as an internal or external command,

Any idea where I'm going wrong? I need to install via package.json as I want to use on our build.