20 Powerful APIs That Will Supercharge Your Javascript Apps

Due to JavaScript’s low barrier of entry, it is the most popular programming language for building web applications. On that note, there are many remarkable JavaScript frameworks built to make your app development process easier. The Sencha Ext JS JavaScript framework is one of the most powerful and can turbocharge your development. 

Sencha Ext JS is also the most comprehensive JavaScript framework for building data-intensive, cross-platform web and mobile applications for any modern device. It includes 140+ pre-integrated and tested high-performance UI components. 

That said, considering the numerous Javascript use cases, it is generally an interpreted language. And, in today’s world, where time is of the essence, you cannot overstate the need for seamless and fast applications. To this end, Sencha Ext JS supports Rest APIs. With this framework, you can easily access APIs to turbocharge your web apps. Head over and check out the Sencha Ext JS documentation for making a REST API call.

Let’s look at 20 powerful APIs that can boost your Javascript apps. 


The ipstack API is a powerful, real-time IP to geolocation API capable of looking up accurate location data and assessing security threats originating from risky IP addresses. It delivers results within milliseconds in JSON or XML format. With this API, you can locate website visitors at first glance and adjust your user experience and application accordingly.


Userstack offers a real-time, easy-to-use REST API interface capable of parsing User-Agent strings to accurately detect device, browser and operating system information. Implementing the JSON/XML API in your frontend or backend system will give you all the tools you need to take control of your website’s or application’s user experience and the customer journey that goes with it.



The positionstack API was built to offer a straightforward and reliable solution for forward and reverse geocoding, covering more than 2 billion places and addresses worldwide. Its results can be delivered in JSON, XML or geocode-specific GeoJSON. Also, Average API response times range between 10ms and 100ms depending on the size of your request.



Languagelayer is a simple and powerful REST API built to efficiently match text of any length to its corresponding language, cross-referencing single words, expressions and grammatical constructions, as well as taking into account any existing accents, dialects and other linguistic deviations.



ipapi provides an easy-to-use API interface allowing customers to look up various pieces of information IPv4 and IPv6 addresses are associated with. For each IP address processed, the API returns more than 45 unique data points, such as location data, connection data, ISP information, time zone, currency and security assessment data.

This API is REST-based, lookup requests are made using straightforward HTTP GET URLs and results are returned in lightweight JSON or XML format within a matter of a few milliseconds.



Mailboxlayer offers a simple REST-based JSON API enabling you to thoroughly check and verify email addresses right at the point of entry into your system.

In addition to checking the syntax, the actual existence of an email address using MX-Records and the Simple Mail Transfer Protocol (SMTP), and detecting whether or not the requested mailbox is configured to catch all incoming mail traffic, the mailboxlayer API is linked to a number of regularly updated databases containing all available email providers, which simplifies the separation of disposable (e.g. “mailinator”) and free email addresses (e.g. “Gmail”, “yahoo”) from individual domains.



Vatlayer is a simple JSON-based REST API that enables you to validate VAT numbers, retrieve all or single EU VAT rates based on IP address or country code, convert prices in compliance with EU VAT rates and types, and more.



NumVerify offers a full-featured yet simple RESTful JSON API for national and international phone number validation and information lookup for a total of 232 countries around the world.

Requested numbers are processed in real-time, cross-checked with the latest international numbering plan databases and returned in handy JSON format enriched with useful carrier, geographical location and line type data.



The mediastack API was built to provide a powerful, scalable yet easy-to-use REST API interface delivering worldwide live and historical news data in handy JSON format. The API comes with a single news HTTP GET endpoint along with a series of parameters and options you can use to narrow down your news data results. 



The coinlayer API is capable of delivering accurate exchange rate data for more than 3l5 cryptocurrencies in real-time. Crypto data is gathered from some of the largest cryptocurrency exchanges, requested using HTTP GET and returned in straightforward JSON format. Thanks to a refined fallback algorithm availability, consistency and reliability of crypto data returned by the coinlayer API are at the highest level.



The aviationstack API was built to provide a simple way of accessing global aviation data for real-time and historical flights as well as allow customers to tap into an extensive data set of airline routes and other up-to-date aviation-related information. Requests to the REST API are made using a straightforward HTTP GET URL structure, and responses are provided in lightweight JSON format.



Currencylayer provides a simple REST API with real-time and historical exchange rates for 16l world currencies, delivering currency pairs in universally usable JSON format – compatible with any of your applications.

Spot exchange rate data is retrieved from several major forex data providers in real-time, validated, processed and delivered hourly every 10 minutes, or even within the 60-second market window.



Screenshotlayer is a lightweight REST API built to deliver high-quality PNG, JPEG & GIF website screenshots at unparalleled speeds and through a simple interface.

To ensure the highest possible level of image resolution, this API relies on a powerful rendering engine capable of processing, storing and returning all sorts of website content within just a few seconds.


Fixer API

Powered by 15+ exchange rate data sources, the Fixer API can deliver real-time exchange rate data for 170 world currencies. The API comes with multiple endpoints, each serving a different use case. Endpoint functionalities include getting the latest exchange rate data for all or a specific set of currencies, converting amounts from one currency to another, retrieving Time-Series data for one or multiple currencies and querying the API for daily fluctuation data.



The weatherstack API is built to deliver accurate weather data for any application and use case, from real-time and historical weather information all the way to 14-day weather forecasts. Also, it supports all major programming languages. 



This API is built upon a RESTful and easy-to-understand request and response structure. API requests are always sent using a simple API request URL with a series of required and optional HTTP GET parameters, and API responses are provided in lightweight JSON format.



The scrapestack API is built to offer a simple REST API interface for scraping web pages at scale without having to deal with geolocations, IP blocks or CAPTCHAs programmatically. This API supports a series of features essential to web-scraping, such as JavaScript rendering, custom HTTP headers, various geo-targets, POST/PUT requests and an option to use premium residential proxies instead of datacenter proxies.



The pdflayer API is built to provide a quick and seamless way to automate HTML to PDF conversion in any application. Its lightweight RESTful infrastructure is based on an efficient combination of the most powerful PDF rendering engines available, making it the most cost-effective and reliable option for anyone looking to process small or large numbers of documents within short time windows.

The pdflayer API comes with a full set of customisation functionalities, including document configuration, a series of layout adjustment options, authentication and security, design and branding tweaks, and much more.



The serpstack API is built to offer a way of scraping Google SERP data in real-time and at scale. Implementation takes just a few minutes using the simple HTTP GET URL structure, and results are returned in JSON or CSV.



With over 15 exchange rate data sources, the Exchangerates API is delivering exchanging rates data for more than 170 world currencies. This API has several endpoints, where each of them serves a different purpose, use case.

The endpoints include functionalities like receiving the latest exchange rates information for a specific set, or for all currencies; conversion from one to another currency; receiving data Time-series for multiple or for one currency, and preserving the API daily for the fluctuation data.


How Can I Supercharge My Web Application?

As earlier stated, Javascript is an interpreted language. Therefore, boosting it’s capabilities with APIs is a quick way to turbocharge your apps. The trick is to offload tasks to powerful APIs like those from apilayer mentioned in this article to bring added functionality right into your browser applications. 

Ready to get started creating super fast and stunning web applications? Click here to get started.