Showing all posts from a Twitter user - twitter

Using Twitter's API is it possible to write an application to show all the posts from a particular user when you don't know the Twitter password for that user?

If the posts/tweets are not protected, yes. You need the Twitter user_id or screen_name.
Check this API

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Allow private/protected Twitter profiles to be seen via Application tokens

So I'm building an app which allows to link a twitter user during registration. Now a problem which has been seen is that some twitter users have their profiles set to private and no post can be shown.
This is not a good thing as an admin should directly go to a twitter profile to manually (for now) check if a twitter profile is fake or not.
Now my question: is there a part of the twitter API where you can use tokens to generate a url which will be used to show tweets only for users which authenticated with my app?
No, there is no way to do this. A protected user must choose to allow another user to follow them in order for the Tweets to be seen. This is not part of the Twitter API.

Search any twitter users feed

Its been a while since i last used the twitter api, Using Javscript, I would like to be able to search any random twitter users feed.
On the page I would enter there Twitter username and the app would go and find the users data returned as JSON.
I'm not after the code, I would just like to know what is the best API to use for this?
Do I just need the REST API, I assume this:
https://dev.twitter.com/rest/public/search
Also, authentication do I need to authenticate my app? how should I do that if its needed?
thanks.
If you want all of my tweets (#edent) you will need to use the User Timeline API
For example:
https://dev.twitter.com/rest/reference/get/statuses/user_timeline?screen_name=edent
Yes, you will need your app to be authenticated. You will need to use OAuth

Fetch User's MailID while logging in by Twitter

I need to fetch User's MailID in my app at the time of login by Twitter.Is it possible to take using twitter Rest API ? As far as i checked it is not possible.Other than that How can i able to fetch User's MailID ? Is there any solution for this ?
i hvae checked on this Rest API Twitter Rest API .But not possible to fetch User's mailID.
Thanks in Advance
u can get the user information from Accounts frameworks for this user has to set the twitter account in the device's settings see here
and also for your question see this, it is not possible to get email id :(

Post Tweet as other user using Twitter API?

I've sorted the OAuth Twitter stuff and currently all my application does is grab Tweets and display them on a web page. After the user has given permission for my application to use their account, is there a way to post a Tweet on their behalf i.e. post AS them?
First point of call would be reading here - https://dev.twitter.com/docs/auth/oauth/oauth-echo

Can I get a list of users who have authorized my Twitter app?

I'm trying to get a list of users who have authorized my Twitter application. I've tried checking the API docs, but there seems to be no twitter application specific APIs that I can find. I'm trying to avoid having to store these twitter user names myself, since the user list would be the exact same as Twitter's authorized user list and even handle deauthorized users for me.
No, there's no way to obtain this information from the Twitter API. If you're interested in keeping track of the users who are using your application, you'll need to track it yourself.

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