# Google App Engine

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Cloud-based web application hosting service

This article's factual accuracy may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information. (July 2024)

Google App Engine Developer Google Release April 7, 2008; 18 years ago (2008-04-07)[1] Type Platform as a service Website cloud.google.com/appengine/

**Google App Engine** (also referred to as **GAE** or **App Engine**) is a [cloud computing](/source/Cloud_computing) [platform used as a service](/source/Platform_as_a_service) for developing and hosting [web applications](/source/Web_application). Applications are [sandboxed](/source/Sandbox_(computer_security)) and run across multiple Google-managed servers.[2] GAE supports automatic scaling for web applications, allocating more resources to the web application as the amount of requests increases.[3] It was released as a [preview](/source/Preview_for_Developers) in April 2008 and launched officially in September 2011.

Applications written in [Go](/source/Go_(programming_language)), [PHP](/source/PHP), [Java](/source/Java_(programming_language)), [Python](/source/Python_(programming_language)), [Node.js](/source/Node.js), [.NET](/source/.NET_Framework), and [Ruby](/source/Ruby_(programming_language)) are supported by the App Engine, and other languages can be supported at an additional cost.[4] The free version of the service offers a standard environment with limited resources. Fees are charged for additional storage, [bandwidth](/source/Bandwidth_(computing)), or instance hours.[5]

## Features

Google App Engine primarily supports [Go](/source/Go_(programming_language)), [PHP](/source/PHP), [Java](/source/Java_(programming_language)), [Python](/source/Python_(programming_language)), [Node.js](/source/Node.js), [.NET](/source/.NET_Framework), and [Ruby](/source/Ruby_(programming_language)) applications, although it can also support other languages via "custom runtimes".[4]

Python web frameworks that run on Google App Engine include [Django](/source/Django_(Web_framework)), [CherryPy](/source/CherryPy), [Pyramid](/source/Pylons_project#Pyramid), [Flask](/source/Flask_(programming)), and [web2py](/source/Web2py) as well as a Google-written web app framework and several others designed specifically for the platform that was created after the release.[6] Any Python framework that supports the [WSGI](/source/Web_Server_Gateway_Interface) using the CGI adapter can be used to create an application, and the framework can be uploaded with the developed application. Third-party libraries written in Python may also be uploaded.[7][8]

SDK version 1.2.2 added support for bulk downloads of data using Python.[9]

App Engine's integrated [Google Cloud Datastore](/source/Google_Cloud_Datastore) database has a [SQL](/source/SQL)-like syntax called "[GQL](/source/Google_Cloud_Datastore#GQL)" ([Google Query Language](/source/Google_Query_Language)). GQL does not support the [join](/source/Join_(SQL)) statement.[10] Instead, one-to-many and many-to-many relationships can be accomplished using ReferenceProperty().[11]

[Google Cloud Firestore](/source/Firebase) is the successor to Google Cloud Datastore and replaces GQL with a document-based query method that treats stored objects as collections of documents. Firestore was launched in October 2017.[12]

### Backends

In [Google I/O](/source/Google_I%2FO) 2011, Google announced *App Engine Backends*, which were allowed to run continuously and consume more memory.[13][14] The Backend API was deprecated as of March 13, 2014, in favor of the Modules API.[15] The Modules API introduced finer control over scaling, versioning, and resource allocation, allowing developers to run different parts of an application with distinct performance settings.[16]

### Google Cloud SQL

In October 2011, Google previewed a zero-maintenance SQL database, which supports JDBC and DB-API.[17] This service allows creating, configuring, and using relational databases with App Engine applications. Google Cloud SQL supports MySQL 8.0, 5.7, and 5.6.[18]

### Restrictions

- Developers have read-only access to the file system on App Engine. Applications can use only virtual file systems.

- App Engine can only execute code called from an HTTP request (scheduled background tasks allow for self-calling HTTP requests).

- Users may upload arbitrary Python modules, but only if they are pure Python. [C](/source/C_(programming_language)) and [Pyrex](/source/Pyrex_(programming_language)) modules are not supported.

- Java applications may only use a subset (The JRE Class White List) of the classes from the JRE standard edition.[19] This restriction does not exist with the App Engine Standard Java8 runtime.

- A process started on the server to answer a request can't last more than 60 seconds (with the 1.4.0 release, this restriction does not apply to background jobs anymore).

- Does not support sticky sessions (a.k.a. session affinity), only replicated sessions are supported including limitation of the amount of data being serialized and time for session serialization.

### Application hosting

While other services let users install and configure nearly any *NIX compatible software, App Engine requires developers to use only its [supported languages, APIs, and frameworks](#Supported_programming_languages_and_frameworks). Current APIs allow storing and retrieving data from the document-oriented [Google Cloud Datastore](/source/Google_Cloud_Datastore) database, making HTTP requests, sending e-mail, manipulating images, and caching. Google Cloud SQL[20] can be used for App Engine applications requiring a relational [MySQL](/source/MySQL) compatible database backend.[21]

Per-day and per-minute quotas place restrictions on bandwidth and CPU use, number of requests served, number of concurrent requests, and calls to the various APIs. Individual requests are terminated if they take more than 60 seconds or return more than 32MB of data.

## Portability concerns

Developers worry that the applications will not be portable from App Engine and fear being locked into the technology.[22] In response, there are a number of projects to create open-source back-ends for the various proprietary/closed APIs of the app engine, especially the datastore.

[AppScale](/source/AppScale) automatically deploys and scales unmodified Google App Engine applications over popular public and private cloud systems and on-premises clusters.[23] It can run Python, Java, PHP, and Go applications on EC2, Google Compute Engine, Azure, and other cloud vendors.

The [Web2py](/source/Web2py) web framework offers migration between SQL Databases and Google App Engine, however, it doesn't support several App Engine-specific features such as transactions and namespaces.[24]

[Kubernetes](/source/Kubernetes) is an open-source job control system invented by Google to abstract away the infrastructure so that open-source (e.g. Docker) containerized applications can run on many types of infrastructure, such as [Amazon Web Services](/source/Amazon_Web_Services), [Microsoft Azure](/source/Microsoft_Azure), and others.

## Usage quotas

Google App Engine requires a Google account to get started, and an account may allow the developer to register up to 25 free applications and an unlimited number of paid applications.[25]

Google App Engine defines usage quotas for free applications. Extensions to these quotas can be requested, and application authors can pay for additional resources.[26]

## See also

- [AWS Elastic Beanstalk](/source/AWS_Elastic_Beanstalk)

- [Google Apps Script](/source/Google_Apps_Script)

- [Google Cloud Platform](/source/Google_Cloud_Platform)

- [Heroku](/source/Heroku)

- [Microsoft Azure](/source/Microsoft_Azure)

- [Oracle Cloud Platform](/source/Oracle_Cloud#Platform_as_a_Service_(PaaS))

- [Rackspace Cloud](/source/Rackspace_Cloud)

- [VMware](/source/VMware)

## References

1. **[^](#cite_ref-1)** ["Introducing Google App Engine + our new blog"](https://googleappengine.blogspot.com/2008/04/introducing-google-app-engine-our-new.html). *Google App Engine Blog*. April 7, 2008. Retrieved December 3, 2019.

1. **[^](#cite_ref-2)** ["Python Runtime Environment - Google App Engine - Google Code"](https://code.google.com/appengine/docs/python/runtime.html). February 22, 1999. Retrieved February 14, 2012.

1. **[^](#cite_ref-3)** Sanderson, Dan (2009). [*Programming Google App Engine: Build and Run Scalable Web Apps on Google's Infrastructure*](https://archive.org/details/programminggoogl0000sand). [O'Reilly Media](/source/O'Reilly_Media). [ISBN](/source/ISBN_(identifier)) [978-0-596-52272-8](https://en.wikipedia.org/wiki/Special:BookSources/978-0-596-52272-8).

1. ^ [***a***](#cite_ref-Google_App_Engine_Documentation_|_App_Engine_Documentation_4-0) [***b***](#cite_ref-Google_App_Engine_Documentation_|_App_Engine_Documentation_4-1) ["Google App Engine Documentation | App Engine Documentation"](https://cloud.google.com/appengine/docs/). *Google Cloud*. Retrieved December 3, 2019.

1. **[^](#cite_ref-5)** ["Quotas - Google App Engine - Google Code"](https://cloud.google.com/appengine/docs/quotas). February 22, 1999. Retrieved February 14, 2012.

1. **[^](#cite_ref-6)** ["AppEngineFrameworks - tipfy - The almighty little framework for Google App Engine - Google Project Hosting"](https://code.google.com/p/tipfy/wiki/AppEngineFrameworks). Retrieved February 14, 2012.

1. **[^](#cite_ref-7)** ["What Is Google App Engine? - Google App Engine - Google Code"](https://cloud.google.com/appengine/docs/whatisgoogleappengine?csw=1). February 22, 1999. Retrieved February 14, 2012.

1. **[^](#cite_ref-8)** ["webapp Overview - Google App Engine - Google Code"](https://cloud.google.com/appengine/docs/python/tools/webapp/). February 22, 1999. Retrieved February 14, 2012.

1. **[^](#cite_ref-9)** ["Uploading and Downloading Data - Google App Engine - Google Code"](https://cloud.google.com/appengine/docs/adminconsole/datastoreadmin?csw=1#backup_and_restore). February 22, 1999. Retrieved February 14, 2012.

1. **[^](#cite_ref-10)** ["Campfire One: Introducing Google App Engine (pt. 3)"](https://www.youtube.com/watch?v=oG6Ac7d-Nx8). April 7, 2008 – via YouTube.

1. **[^](#cite_ref-11)** ["Modeling Entity Relationships - Google App Engine — Google Developers"](https://code.google.com/appengine/articles/modeling.html). June 26, 2012. Retrieved July 17, 2012.

1. **[^](#cite_ref-12)** ["Google launches Cloud Firestore, a new document database for app developers"](https://techcrunch.com/2017/10/03/google-launches-cloud-firestore-a-new-document-database-for-app-developers). *TechCrunch*. October 3, 2017. Retrieved July 16, 2018.

1. **[^](#cite_ref-13)** [Google I/O 2011: App Engine Backends](https://www.youtube.com/watch?v=-kepYfCBg6w) on [YouTube](/source/YouTube_video_(identifier))

1. **[^](#cite_ref-14)** ["Backends Python API Overview - App Engine standard environment for Python - Google Cloud Platform"](https://cloud.google.com/appengine/docs/python/backends/?csw=1). *Google Cloud Platform*.

1. **[^](#cite_ref-15)** ["Backends Python API Overview - App Engine standard environment for Python - Google Cloud Platform"](https://cloud.google.com/appengine/docs/python/backends/). *Google Cloud Platform*.

1. **[^](#cite_ref-16)** ["Using the Modules API | Google App Engine standard environment docs"](https://cloud.google.com/appengine/docs/standard/services/modules). *Google Cloud*. Retrieved February 16, 2025.

1. **[^](#cite_ref-17)** ["Google Cloud SQL: your database in the cloud - The official Google Code blog"](https://googlecode.blogspot.com/2011/10/google-cloud-sql-your-database-in-cloud.html). October 6, 2011.

1. **[^](#cite_ref-18)** ["Cloud SQL Features - Cloud SQL Documentation - Google Cloud Platform"](https://cloud.google.com/sql/docs/features). *Google Cloud Platform*.

1. **[^](#cite_ref-google1_19-0)** ["The JRE Class White List - Google App Engine - Google Developers"](https://web.archive.org/web/20150320122007/https://cloud.google.com/appengine/docs/java/jrewhitelist). February 22, 1999. Archived from [the original](https://cloud.google.com/appengine/docs/java/jrewhitelist) on March 20, 2015. Retrieved June 14, 2013.

1. **[^](#cite_ref-20)** ["Google Cloud SQL Databases - Cloud SQL - Google Cloud Platform"](https://cloud.google.com/sql/docs). *Google Cloud Platform*.

1. **[^](#cite_ref-21)** ["Using Google Cloud SQL - App Engine standard environment for Java - Google Cloud Platform"](https://cloud.google.com/appengine/docs/java/cloud-sql/). *Google Cloud Platform*.

1. **[^](#cite_ref-22)** Gallagher, Sean (April 9, 2008). ["Analysis: Google App Engine alluring, will be hard to escape"](https://arstechnica.com/old/content/2008/04/analysis-google-app-engine-alluring-will-be-hard-to-escape.ars). Ars Technica. Retrieved July 17, 2012.

1. **[^](#cite_ref-23)** [AppScale Launches As An Open-Source Backup Equivalent To Google App Engine](https://techcrunch.com/2013/06/24/appscale-launches-as-an-open-source-backup-equivalent-to-google-app-engine/). TechCrunch (June 24, 2013). Retrieved on 2013-09-18.

1. **[^](#cite_ref-24)** [\[1\]](http://web2py.com/book/default/section/11/13) [Archived](https://web.archive.org/web/20100220195348/http://web2py.com/book/default/section/11/13) February 20, 2010, at the [Wayback Machine](/source/Wayback_Machine)

1. **[^](#cite_ref-25)** ["Google App Engine General Questions"](https://cloud.google.com/appengine/kb/general#create). *Google Developers*. Retrieved June 18, 2015.

1. **[^](#cite_ref-Quotas_26-0)** ["Understanding Application Quotas with Google App Engine"](https://cloud.google.com/appengine/docs/quotas). Retrieved April 16, 2010.

## Bibliography

- Sanderson, Dan (October 26, 2012), [*Programming Google App Engine*](http://shop.oreilly.com/product/0636920017547.do) (2nd ed.), [O'Reilly Media](/source/O'Reilly_Media), p. 536, [ISBN](/source/ISBN_(identifier)) [978-1449398262](https://en.wikipedia.org/wiki/Special:BookSources/978-1449398262)

- de Jonge, Adriaan (October 31, 2011), [*Essential App Engine: Building High-Performance Java Apps with Google App Engine*](http://www.informit.com/store/product.aspx?isbn=0132484781) (1st ed.), [Addison-Wesley Professional](/source/Addison-Wesley_Professional), p. 304, [ISBN](/source/ISBN_(identifier)) [978-0-321-74263-6](https://en.wikipedia.org/wiki/Special:BookSources/978-0-321-74263-6)

- Guermeur, Daniel; Unruh, Amy (November 24, 2010), [*Google App Engine Java and GWT Application Development*](https://www.packtpub.com/google-app-engine-java-and-gwt-application-development/book) (1st ed.), [Packt Publishing](/source/Packt_Publishing), p. 480, [ISBN](/source/ISBN_(identifier)) [978-1-84969-044-7](https://en.wikipedia.org/wiki/Special:BookSources/978-1-84969-044-7)

- Roche, Kyle; Douglas, Jeff (December 31, 2009), [*Beginning Java Google App Engine*](http://www.apress.com/9781430225539) (1st ed.), [Apress](/source/Apress), p. 375, [ISBN](/source/ISBN_(identifier)) [978-1-4302-2553-9](https://en.wikipedia.org/wiki/Special:BookSources/978-1-4302-2553-9)

- Sanderson, Dan (November 23, 2009), [*Programming Google App Engine*](https://archive.org/details/programminggoogl0000sand/page/400) (1st ed.), [O'Reilly Media](/source/O'Reilly_Media), p. [400](https://archive.org/details/programminggoogl0000sand/page/400), [ISBN](/source/ISBN_(identifier)) [978-0-596-52272-8](https://en.wikipedia.org/wiki/Special:BookSources/978-0-596-52272-8)

- Severance, Charles (May 22, 2009), [*Using Google App Engine*](https://archive.org/details/usinggoogleappen0000seve/page/262) (1st ed.), [O'Reilly Media](/source/O'Reilly_Media), p. [262](https://archive.org/details/usinggoogleappen0000seve/page/262), [ISBN](/source/ISBN_(identifier)) [978-0-596-80069-7](https://en.wikipedia.org/wiki/Special:BookSources/978-0-596-80069-7)

- Ciurana, Eugene (February 2, 2009), [*Developing with Google App Engine*](http://www.apress.com/9781430218319) (1st ed.), [Apress](/source/Apress), p. 164, [ISBN](/source/ISBN_(identifier)) [978-1-4302-1831-9](https://en.wikipedia.org/wiki/Special:BookSources/978-1-4302-1831-9)

## External links

- [Official marketing page](https://cloud.google.com/appengine/)

- [Official website](https://cloud.google.com/appengine/docs)

- [Official Google Cloud Platform Blog](https://googlecloudplatform.blogspot.com/)

- [Release notes](https://code.google.com/p/googleappengine/wiki/SdkReleaseNotes)

- [Google App Engine - Run your web applications on Google's infrastructure](http://www.stanford.edu/class/ee380/Abstracts/081105.html) - a technical talk by Google engineer [Guido van Rossum](/source/Guido_van_Rossum) at [Stanford University](/source/Stanford_University). ([online video archive](https://web.archive.org/web/20090326060917/http://stanford-online.stanford.edu/courses/ee380/081105-ee380-300.asx))

- [Benefits of adopting Google App Engine](http://blog.adjutas.com/index.php/2017/01/27/benefits-of-adopting-google-app-engine/) [Archived](https://web.archive.org/web/20170202052421/http://blog.adjutas.com/index.php/2017/01/27/benefits-of-adopting-google-app-engine/) February 2, 2017, at the [Wayback Machine](/source/Wayback_Machine)

- [Using an external database with Google App Engine](http://blog.adjutas.com/index.php/2016/11/24/using-an-external-database-with-google-app-engine/) [Archived](https://web.archive.org/web/20170806115611/http://blog.adjutas.com/index.php/2016/11/24/using-an-external-database-with-google-app-engine/) August 6, 2017, at the [Wayback Machine](/source/Wayback_Machine)

- [Java Frameworks and libraries supported](https://web.archive.org/web/20090416214549/http://spreadsheets.google.com/pub?key=pRJ_0hajVrhacLjp3HqD5ew)

- [Web2py book -- online documentation -- Google App Engine deployment recipe](https://web.archive.org/web/20100220195348/http://web2py.com/book/default/section/11/13)

- [Google Cloud SQL Sample Projects](https://code.google.com/p/cloudsql/)

- [Google Cloud supports node.js](https://cloud.google.com/solutions/nodejs/)

- [**Appmd**: Python development sample project. App Engine/django/Google Closure/Endpoints/Material design](https://github.com/jacobcui/appmd)

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v t e Google Cloud Platform Cloud App Engine BigQuery Bigtable Compute Engine Dataflow Datastore Shell Storage Vertex AI Subsidiaries Apigee Bitium Chronicle VirusTotal Kaggle Looker Mandiant Orbitera Google Workspace Chat Classroom Cloud Search Meet Voice Workspace Marketplace

v t e Cloud computing Business models Content as a service Data as a service Desktop as a service Function as a service Infrastructure as a service Integration platform as a service Backend as a service Network as a service Platform as a service Security as a service Software as a service Technologies Cloud database Cloud-native computing Cloud storage Cloud storage gateways Data centers Dew computing Distributed file system for cloud Hardware virtualization Internet Mobile cloud computing Native cloud application Networking Personal cloud Security Serverless computing Structured storage Virtual appliance Web APIs Virtual private cloud Applications Box Dropbox Google Workspace Drive HP Cloud (closed) IBM Cloud Lark Microsoft Office 365 OneDrive Nextcloud OpenDesk Oracle Cloud Owncloud Proton Drive Rackspace Salesforce Seafile PlateSpin Workday Zoho Platforms Alibaba Cloud Amazon Web Services AppScale Box CloudBolt Cloud Foundry Cocaine (PaaS) Engine Yard Helion GE Predix Google App Engine GreenQloud Heroku IBM Cloud Inktank Jelastic Microsoft Azure MindSphere Netlify Oracle Cloud OutSystems openQRM OpenShift PythonAnywhere RightScale Scalr Force.com SAP Business Technology Platform Splunk Vercel vCloud Air WaveMaker Infrastructure Alibaba Cloud Amazon Web Services Abiquo Enterprise Edition CloudStack Citrix Cloud Deft DigitalOcean EMC Atmos Eucalyptus Fujitsu Google Cloud GreenButton GreenQloud IBM Cloud iland Joyent Linode Lunacloud Microsoft Azure Mirantis Netlify Nimbula Nimbus OpenIO OpenNebula OpenStack Oracle Cloud OrionVM Rackspace Cloud Safe Swiss Cloud Zadara libvirt libguestfs OVirt Virtual Machine Manager Wakame-vdc Vercel Virtual Private Cloud OnDemand Category Commons

Authority control databases GND

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Adapted from the Wikipedia article [Google App Engine](https://en.wikipedia.org/wiki/Google_App_Engine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Google_App_Engine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.