# What is GraphQL?

> What is GraphQL? Learn how this API query language works, when to use it vs REST, and how it improves mobile and web app performance.

Canonical: https://app369.com/glossary/what-is-graphql/

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Quick Answer

**GraphQL is a query language for APIs that lets clients request exactly the data they need in a single request, unlike REST APIs where each endpoint returns a fixed data structure.**

**GraphQL** is a query language for [APIs](https://app369.com/glossary/what-is-api/) developed by Facebook in 2012 and open-sourced in 2015. Instead of the server deciding what data each endpoint returns (as with [REST](https://app369.com/glossary/what-is-rest-api/)), the client specifies exactly what fields it needs in each request.

## How GraphQL Differs from REST

With a REST API, fetching a user profile with their recent posts and follower count might require three separate API calls: one for the user, one for posts, and one for followers. Each call returns all fields in the resource, even if you only need a few.

With GraphQL, a single query fetches exactly the fields you need from all three resources in one request. This reduces network traffic, speeds up mobile apps on slow connections, and simplifies frontend code.

## When to Use GraphQL

GraphQL shines in applications with **complex data relationships** (social networks, marketplaces, dashboards), **multiple client types** (mobile app, web app, and admin panel all needing different data), and **rapidly evolving requirements** where adding new fields should not require backend changes.

REST is simpler and sufficient for applications with straightforward data access patterns, simple CRUD operations, or when caching at the HTTP level is important.

## GraphQL in Practice

Major companies using GraphQL include GitHub (their entire v4 API), Shopify, Airbnb, and Netflix. The ecosystem includes tools like Apollo Client for frontend integration, Apollo Server and Hasura for backend implementation, and GraphQL Code Generator for type-safe development.

## GraphQL at App369

At [App369](https://app369.com), we choose the right API architecture for each project. For data-heavy applications with complex queries, GraphQL delivers significant performance and developer experience improvements. For simpler applications, REST remains the pragmatic choice. [Contact us](https://app369.com/contact/) to discuss the best approach for your project.

## **Related Terms **

[what is api](https://app369.com/glossary/what-is-api/) [what is rest api](https://app369.com/glossary/what-is-rest-api/) [what is backend](https://app369.com/glossary/what-is-backend/)

## **Related Services **

[web apps](https://app369.com/service/web-apps/) [mobile apps](https://app369.com/service/mobile-apps/)

## **Prefer a fixed price?**

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- [**Stripe Billing Fix and Setup**$950Subscriptions, webhooks, customer portal and failed payments set up or fixed, tested in Stripe test mode.](https://app369.com/fixed-price/stripe-billing-setup/)
- [**App Fix Ticket**from $450One reproducible bug in an existing mobile or web app, diagnosed and fixed.](https://app369.com/fixed-price/flutter-firebase-bug-fix/)

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