What is the use of Wordpress APIs? - wordpress

I saw in wordpress some APIs being published for developers. What could a developer gain by using those APIs?

I think you've taken API to mean something similar to what Flickr and Vimeo do, which they are not. They are simply ways for you to access and ammend core functionality of the Wordpress platform, so as to bend it to do what ever it is you need it to do.
There are ways to pull data from your blog to a mobile devise, but that is a very different question.

Wordpress API are for those that want to develop a theme, or writing custom plugins for Wordpress.
Either way, you can use to integrate Wordpress in your exisiting php site, using the powerful backend as an administration tool and the using the API to retrieve the content and present it in your (already) website.
http://codex.wordpress.org/Integrating_WordPress_with_Your_Website

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Is there any way to add CMS to Nextjs website (such as Wordpress)?

I developed a website using Nextjs (Client side only, and used Nextjs for the SEO).
I wanted to ask if there is a way to convert this website somehow from Nextjs to Wordpress or anything else, or even somehow connect it to CMS application, so my client can modify images and content any time he want by his own.
Currently, the web application in Nextjs is pretty static, all the pages and conntent are hard coded wroten.
All my data are in JSON files and such are the images in the website.
Yes! This is a pretty hot topic right now, and there are many ways to accomplish it.
Here are the general guidelines:
Set up a "headless CMS" - this can be WordPress (set up in a special way so you are using just the backend) - or there are many other popular options, such as Contentful, Sanity, Prismic...
Your CMS needs to have an API for Next.js to use. If you go with WordPress, you can use the built-in REST API - or you can use the WP GraphQL plugin
This is such a popular topic, that if you search around, you'll find many helpful guides that go into more detail. You'll want to search "Next.JS with WordPress headless CMS"
Here's one example I found that uses GraphQL and looks fairly thorough.
Or, if you're not set on WordPress, check out Next.js-specific information for other popular headless CMS's - most of them will have specific documentation and guides for Next.JS - for example Sanity's Next.JS Guides.
WordPress is solid and flexible - but if you're not already a fairly strong WP developer, then I might recommend going with one of the more pre-packaged options (like Sanity, Prismic, Contentful, etc.) - many of them have a free tier.

I'm trying to implement external REST APIs in my wordpress website. Can anybody have idea how to do it (whether with a plugin or with programming)

I tried to use one plugin called "WP Data Sync". I am also going through its documentation/ support for the same. I am also having wpbakery page builder in my website. So is there any way that we sync with that also?
Note - We have to sync data in the form of images, image gallery, events listing, and the blog posts.
Did you check out WP Data Syncs website at https://wpdatasync.com/ and create an account to check out an API key?
I'm not sure about all APIs, but the ones I've used in the past would require me to register with the API's website, get issued an API key and maybe even designate the key to a specific website (your WordPress site in this case) for security reasons. After that, you would then go to your WP site and setup the API there via WP DataSyncs plugin.
I hope I understood your question and that this helps.

Should I use WordPress as backend for mobile app

I’m about to build an app that will look like a social network: people will be able to create accounts, like posts, save posts (But not create posts).
I’m searching the right platform to build my backend, I saw many options like Parse or Node.js but I did not see many people using WordPress as backend.
My question is why not use WordPress as my backend and develop custom plugins as I need? What is the pros and cons? Am I missing something that makes people not using WordPress?
Thanks
You can use the WordPress as the backend of your app as per your requirement, As WordPress allows wp-JSON API & WooCommerce API as well.
Also you can integrate the JWT Authentication for WP REST API plugin if you want to implement the JWT authentication
Also you can customize as per your requirement so i suggest to use the wordpress as backend of your app
There are a lot of people using Parse Server for building social networks and it is a great fit. Take a look at the following app template. It shows how to build an Instagram app.
https://www.back4app.com/database/back4app/instagram-clone-swiftui

Does Facebook use WordPress to fully develop some of its websites

I want to know if Facebook uses WordPress to fully create any of its web pages because I use a plugin in my browser that is able to detect sites developed with WordPress. So I opened one of Facebook's sub domains and the plugin says it uses WordPress. I was a bit surprised because I thought a huge company with lots of engineers would prefer developing a site from scratch to better suit its needs.
Yes. Here is one of their subdomains, built fully with WordPress:
http://newsroom.fb.com/

Interacting with the wordpress api with an asp.net application

I have built an asp.net application from which I would like to post blog entries to wordpress, using the wordpress API. Thus far I have been unable to find any good tutorials or walkthroughs to do so. How might I use the wordpress API to upload blog content via an asp.net application?
I know that you should use the xml-rpc (probably need to enable on your server under administration area). xml-rpc. However, actual implementation details I am not positive on. Hopefully this gives you a start.
http://codex.wordpress.org/XML-RPC_wp

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