Back to all guides

How To Build a Sentence Generator App Using a Simple API?

•

Mon Mar 14 2022

•

9 min read

Saad Irfan

In this piece, I will build a sentence generator app that will take a few words like subject, object, and verb and then generate a sentence using them. So without any further ado, let’s jump in!

Stack

We need to choose a stack first to build this application. I have decided to go with the Jamstack.

I am going to use Next.js for the client-side and TailwindCSS for the styling.

If you don’t know about Next.js, it is a JavaScript framework built on top of React and provides features like server-side rendering, static site generation, etc. Tailwind is a CSS framework that provides utility classes to speed up the development process.

Choosing The API

Let’s find an API that we can use to create sentences. Go to RapidAPI Hub and create an account if you haven’t already and then search for “sentence generation” in the search section.

Loading component...

You will see different search results related to all the recommendation APIs. For this piece, I will use Linguatools Sentence Generating API.

To use this API, you need to subscribe to it first. You can do this by clicking on Subscribe to Test button.

Subscribe to Linguatools Sentence Generating API

Once you click the button, you will be redirected to another page where different available subscription packages will be shown. Let’s go with the free one for now.

After all this, you will be redirected back to the original page. Here you will have a key x-rapidapi-key. Save it somewhere. It will be used later in the application.

Building The UI

You can create a Next.js boilerplate with TailwindCSS integrated by running the following command in your terminal. So let’s do that.

sh
npx create-next-app -e with-tailwindcss sentence-generator-app

This command is going to take a minute to set everything up. After generating the boilerplate, you will see a folder with the name sentence-generator-app has been created. Open this folder in your preferred code editor. I will use VSCode for this project.

Project Files

When you open the project in your code editor, you will see the following directories and files in the root directory:

pages directory: Inside it, you will have files index.js, _app.js, and another directory called - api. You only need to know about the index.js file that is the main entry point in your project.
public directory: This directory contains icons. You place your static files here to load later in the application.
node_modules: It’s another directory that contains all the node modules you are using in your application.
package.json: This file contains the metadata of your project.
package-lock.json: This file is responsible for tracking the exact version of every installed package.
postcss.config.js: This file contains PostCSS configurations.
tailwind.config.js: It contains TailwindCSS configurations.
readme.md: It’s a markdown file for documentation.

Before we move on to writing the code, open this file, and copy all of its content, then paste it inside the tailwind.config.js file in your project. These are some TailwindCSS configurations I have done specifically for this project. I have added some colors that you do not have by default with TailwindCSS and set some screen sizes.

Now let’s start writing the code. I am going to do it in steps so you can follow along.

→ STEP #1

Open the pages/index.js file and remove all the existing code. After this, copy-paste the following code there:

jsx
export default function Home() {
	return (
		<div className="flex flex-col items-center relative min-h-screen">
			<h2 className="font-raleway font-bold text-6xl text-primary pt-20 pb-6 md:text-3xl">
				Sentence <span className="text-secondary">Generator</span> App
			</h2>
			<h3 className="text-secondary text-2xl font-raleway font-bold uppercase tracking-wide mb-12 md:text-base md:px-4 md:text-center">
				Quickly generate an english sentence using a few keywords
			</h3>
		</div>
	);
}

It will create two headings for you with the text “Sentence Generator App” and “Quickly generate an english sentence using a few keywords”. You can change it to anything you prefer.

→ STEP #2

Now let’s create three input fields to get the subject, object, and verb from the user. Also, create a button for generating the sentence. For this, copy the following code and paste it in pages/index.js:

jsx
export default function Home() {
	return (
		<div className="flex flex-col items-center relative min-h-screen">
			<h2 className="font-raleway font-bold text-6xl text-primary pt-20 pb-6 md:text-3xl">
				Sentence <span className="text-secondary">Generator</span> App
			</h2>
			<h3 className="text-secondary text-2xl font-raleway font-bold uppercase tracking-wide mb-12 md:text-base md:px-4 md:text-center">
				Quickly generate an english sentence using few keywords
			</h3>
			<div className="flex flex-col justify-between items-center w-full md:items-center">
				<form className="flex w-full justify-center md:flex-col md:w-5/6">
					<input
						type="text"
						autoFocus={true}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Subject..."
					/>
					<input
						type="text"
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Object..."
					/>
					<input
						type="text"
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Verb..."
					/>
					<button className="outline-none border border-secondary font-bold font-raleway ml-4 px-12 py-2 rounded-sm bg-secondary text-bc transition duration-300 hover:bg-bc hover:text-primary md:ml-0 md:mt-4">
						Generate
					</button>
				</form>
			</div>
		</div>
	);
}

This code is going to create input fields and a button. I have also styled them a little bit using [TailwindCSS]((https://tailwindcss.com/).

→ STEP #3

Let’s create some states to store the subject, object, verb, and the generated sentence that we will receive from the API. For this, copy-paste the following code in pages/index.js.

jsx
import {useState} from 'react';
export default function Home() {
	const [object, setObject] = useState('thief');
	const [subject, setSubject] = useState('police');
	const [verb, setVerb] = useState('arrest');
	const [response, setResponse] = useState(null);
	return (
		<div className="flex flex-col items-center relative min-h-screen">
			<h2 className="font-raleway font-bold text-6xl text-primary pt-20 pb-6 md:text-3xl">
				Sentence <span className="text-secondary">Generator</span> App
			</h2>
			<h3 className="text-secondary text-2xl font-raleway font-bold uppercase tracking-wide mb-12 md:text-base md:px-4 md:text-center">
				Quickly generate an english sentence using few keywords
			</h3>
			<div className="flex flex-col justify-between items-center w-full md:items-center">
				<form className="flex w-full justify-center md:flex-col md:w-5/6">
					<input
						type="text"
						value={subject}
						autoFocus={true}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Subject..."
						onChange={e => setSubject(e.target.value)}
					/>
					<input
						type="text"
						value={object}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Object..."
						onChange={e => setObject(e.target.value)}
					/>
					<input
						type="text"
						value={verb}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Verb..."
						onChange={e => setVerb(e.target.value)}
					/>
					<button className="outline-none border border-secondary font-bold font-raleway ml-4 px-12 py-2 rounded-sm bg-secondary text-bc transition duration-300 hover:bg-bc hover:text-primary md:ml-0 md:mt-4">
						Generate
					</button>
				</form>
			</div>
		</div>
	);
}

You can see that I have added an onChange event handler to set the state value as soon as the user writes something in the input field.

→ STEP #4

Let’s integrate the API now. For this, first, create a .env.local file and paste the following in it:

sh
NEXT_PUBLIC_RAPIDAPI_KEY=YOUR-RAPIDAPI-KEY

You need to replace YOUR-RAPIDAPI-KEY here with the API key you got when you subscribed to the Linguatools Sentence Generating API. It is the value of x-rapidapi-key that you saved earlier.

Now download and add axios to your project. For this, run the following command in the terminal:

sh
npm install axios

Now import axios at the top of the pages/index.js.

js
import axios from 'axios';

→ STEP #5

RapidAPI Hub provides you with code snippets in different languages for integrating the API. I am going to use the (JavaScript) Axios one.

Fetching data using (JavaScript) Axios

Now create a file with the name generate.js inside the pages/api directory. It is going to make a REST API endpoint for you. The endpoint point will look like this:

sh
http://localhost:3000/api/generate

Now copy the following code in this file:

js
import axios from 'axios';
export default async function handler(req, res) {
	if (req.method === 'GET') {
		const options = {
			method: 'GET',
			url: 'https://linguatools-sentence-generating.p.rapidapi.com/realise',
			params: {
				object: req.query.object,
				subject: req.query.subject,
				verb: req.query.verb
			},
			headers: {
				'x-rapidapi-host':
					'linguatools-sentence-generating.p.rapidapi.com',
				'x-rapidapi-key': process.env.NEXT_PUBLIC_RAPIDAPI_KEY
			}
		};
		axios
			.request(options)
			.then(function (response) {
				res.status(200).json(response.data);
			})
			.catch(function (error) {
				console.error(error);
			});
	} else {
		res.status(400);
	}
}

This code makes an API call to the Linguatools Sentence Generating API on the server and returns the results to the user. It executes when the user makes an API call to the generate endpoint I mentioned above.

Once you are done, copy the following code in the pages/index.js file:

jsx
import axios from 'axios';
import {useState} from 'react';
export default function Home() {
	const [object, setObject] = useState('thief');
	const [subject, setSubject] = useState('police');
	const [verb, setVerb] = useState('arrest');
	const [response, setResponse] = useState(null);
	const [btnText, setBtnText] = useState('Generate');
	/**
	 *
	 *
	 * Fetch generated sentence
	 */
	const fetchGeneratedSentence = async e => {
		e.preventDefault();
		setBtnText('Generating');
		try {
			const res = await axios.get(`/api/generate`, {
				params: {
					object,
					subject,
					verb
				}
			});
			setResponse(res.data);
			console.log(res.data);
		} catch (err) {
			console.log(err);
		} finally {
			setBtnText('Generate');
		}
	};
	return (
		<div className="flex flex-col items-center relative min-h-screen">
			<h2 className="font-raleway font-bold text-6xl text-primary pt-20 pb-6 md:text-3xl">
				Sentence <span className="text-secondary">Generator</span> App
			</h2>
			<h3 className="text-secondary text-2xl font-raleway font-bold uppercase tracking-wide mb-12 md:text-base md:px-4 md:text-center">
				Quickly generate an english sentence using few keywords
			</h3>
			<div className="flex flex-col justify-between items-center w-full md:items-center">
				<form className="flex w-full justify-center md:flex-col md:w-5/6">
					<input
						type="text"
						value={subject}
						autoFocus={true}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Subject..."
						onChange={e => setSubject(e.target.value)}
					/>
					<input
						type="text"
						value={object}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Object..."
						onChange={e => setObject(e.target.value)}
					/>
					<input
						type="text"
						value={verb}
						className="border-none outline-none w-1/5 bg-primary px-4 py-2 mx-2 rounded-sm font-raleway md:w-full md:my-2"
						placeholder="Verb..."
						onChange={e => setVerb(e.target.value)}
					/>
					<button
						className="outline-none border border-secondary font-bold font-raleway ml-4 px-12 py-2 rounded-sm bg-secondary text-bc transition duration-300 hover:bg-bc hover:text-primary md:ml-0 md:mt-4"
						onClick={e => fetchGeneratedSentence(e)}
					>
						{btnText}
					</button>
				</form>
				{response && (
					<div className="flex flex-col mt-20 w-3/6 h-4/5 md:flex-col md:w-4/6 md:h-full md:mb-12">
						<p className="mb-12 border border-secondary text-primary font-raleway px-4 py-8 tracking-wide leading-8">
							{response.sentence}
						</p>
					</div>
				)}
			</div>
			<div className="flex flex-col mt-10 justify-end h-36 md:h-24">
				<p className="block mb-10 text-center text-secondary text-xs">
					Made by RapidAPI DevRel Team -{' '}
					<a
						className="hover:text-active"
						href="https://github.com/RapidAPI/DevRel-Examples-External"
					>
						See more examples like this
					</a>
				</p>
			</div>
		</div>
	);
}

You can see that I have created a function, fetchGeneratedSentence, to request the API. I have also created a piece of UI that is conditionally rendering on the screen based on the response state variable value.

When the user clicks the generate button, it will fire the function. Inside the function, an API call will take place that brings along a sentence with itself. That sentence will later be saved in the response state variable.

Wrap Up

That’s it. We have successfully built a Sentence Generator App using Linguatools Sentence Generating API. You can find the source code here of this web app.

In the end, it will look something like this:

Sentence Generator App built with Next.js and Linguatools Sentence Generating API

# RapidAPI # sentence-generator-app

Learn API Development tips & tricks.Subscribe to our newsletter with over 1.7 Million Developers