I'm not sure if this is just because this is a year old or so, but this no longer works. When trying to log in, it throws an unknown error. After a few edits (changing the error object to a string and passing it onto reject), the following error occurs:

(node:18604) UnhandledPromiseRejectionWarning: Error: {"statusCode":400,"data":"{\"errors\":[{\"code\":215,\"message\":\"Bad Authentication data.\"}]}"}
    at C:\...\oauth-utilities.js:37:18
    at C:\...\node_modules\oauth\lib\oauth.js:543:17
    at passBackControl (C:\...\node_modules\oauth\lib\oauth.js:397:13)
    at IncomingMessage.<anonymous> (C:\...\node_modules\oauth\lib\oauth.js:409:9)
    at IncomingMessage.emit (events.js:388:22)
    at endReadableNT (internal/streams/readable.js:1336:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)

I'm just starting out with the Twitter API so I have no idea what's the issue besides that. I'm using a standalone app, so it's using 1.0 instead of 2.0.

(node:58058) UnhandledPromiseRejectionWarning: Error: Error getting OAuth request token
at /Users/sebamac/projects/twitter-oauth-login-in-nodejs/oauth-utilities.js:37:18
at /Users/sebamac/projects/twitter-oauth-login-in-nodejs/node_modules/oauth/lib/oauth.js:543:17
at passBackControl (/Users/sebamac/projects/twitter-oauth-login-in-nodejs/node_modules/oauth/lib/oauth.js:397:13)
at IncomingMessage. (/Users/sebamac/projects/twitter-oauth-login-in-nodejs/node_modules/oauth/lib/oauth.js:409:9)
at IncomingMessage.emit (events.js:387:35)
at endReadableNT (internal/streams/readable.js:1317:12)
at processTicksAndRejections (internal/process/task_queues.js:82:21)
(node:58058) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)

I am getting Error getting OAuth request token on staging server but it's working fine on local

I am also getting this error as well. When I try to click on log in with twitter it fails to open the page and then I get an "Error getting OAuth request token" in console. Not sure why.