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I'm trying to install Selenium Webdriver on Macbook, via Node and NPM in the terminal, and have encountered a few errors during the install - some advice on a solution, or if anybody has encountered this error before would be greatly appreciated.

The error messages I've encountered are as follows:

$ npm install selenium-webdriver
npm WARN saveError ENOENT: no such file or directory, open '/Users/henry/package.json'
npm WARN enoent ENOENT: no such file or directory, open '/Users/henry/package.json'
npm WARN henry No description
npm WARN henry No repository field.
npm WARN henry No README data
npm WARN henry No license field.

Specifically the first error: "$ npm install selenium-webdriver
npm WARN saveError ENOENT: no such file or directory, open '/Users/henry/package.json'" is one that I haven't seen much when looking up this issue in google - what would this refer to in particular?

This is the while message which I see upon pressing enter:

henry@Henrys-MacBook-Pro ~/SeleniumBasicsHenry
$ npm install selenium-webdriver
npm WARN saveError ENOENT: no such file or directory, open '/Users/henry/package.json'
npm WARN enoent ENOENT: no such file or directory, open '/Users/henry/package.json'
npm WARN henry No description
npm WARN henry No repository field.
npm WARN henry No README data
npm WARN henry No license field.

• selenium-webdriver@4.0.0-alpha.1
  updated 1 package and audited 126 packages in 1.507s
  found 0 vulnerabilities

The next error(s) are as follows, whilst trying to install chromedriver:

henry@Henrys-MacBook-Pro ~
$ sudo npm install chromedriver -g
/usr/local/bin/chromedriver -> /usr/local/lib/node_modules/chromedriver/bin/chromedriver

chromedriver@73.0.0 install /usr/local/lib/node_modules/chromedriver
node install.js

/usr/local/lib/node_modules/chromedriver/73.0.3683.20/chromedriver is not writable: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/chromedriver/73.0.3683.20'
/usr/local/lib/node_modules/chromedriver/73.0.3683.20/chromedriver is not writable: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/chromedriver/73.0.3683.20'
ChromeDriver binary exists. Validating...
ChromeDriver 73.0.3683.20 (8e2b610813e167eee3619ac4ce6e42e3ec622017)

ChromeDriver is already available at '/tmp/73.0.3683.20/chromedriver/chromedriver'.
Copying to target path /usr/local/lib/node_modules/chromedriver/lib/chromedriver
ChromeDriver installation failed { Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/chromedriver/lib/chromedriver'
at Object.mkdirSync (fs.js:752:3)
at /usr/local/lib/node_modules/chromedriver/install.js:282:10
errno: -13,
syscall: 'mkdir',
code: 'EACCES',
path: '/usr/local/lib/node_modules/chromedriver/lib/chromedriver' }
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! chromedriver@73.0.0 install: node install.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the chromedriver@73.0.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/henry/.npm/_logs/2019-04-18T19_37_54_156Z-debug.log

Just wondering if this is a permissions error, or something else - the above states that it's unlikely to be a problem with npm - any advice in solving this would be much appreciated,

Many Thanks!

Henry