A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Type to find tags:
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You need help with the use of the Stack Exchange API, apps built on the API, or assistance building scripts that work on Stack Exchange websites.
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Indicates you've found an erroneous or unexpected behavior in the Stack Exchange API, or the Stack Exchange HTML or CSS, that needs to be fixed.
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Indicates that a feature request has been implemented, a bug has been fixed, or another type of request has been processed.
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designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
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Applications that use the Stack Exchange API are listed as questions and tagged with this tag. The body of the question contains details and screenshots of the application.
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indicates a proposal for a new feature for the Stack Exchange API, or a change to an existing feature.
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to post a userscript that operates on Stack Exchange sites and/or uses the Stack Exchange API. For questions about user scripting and Stack Exchange, or its API, use the "scripts" tag in…
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for questions about the Stack Exchange API version 2.
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A question about the Stack Exchange API: usage, functioning, guidelines, etc.
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Question pertaining to the documentation provided with the API.
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A question about how the API returns questions.
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Questions about the built-in API help pages at <https://api.stackexchange.com/docs>.
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Questions about usage of the Stack Exchange API in client-side browser JavaScript.
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actually due to the existing design of the system and is not considered erroneous behaviour.
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Question about any of the API methods that return, in some form, information about tags.
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Libraries which provide access to the Stack Exchange API are listed under the [library] tag. The body of the question will give usage examples, as well as source and licensing details.
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A question about how the API returns reputation for users.
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Questions about searching via the API, typically using the /search method.
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An [app] that takes the form of an extension to the Google Chrome browser.
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Indicates that a request (usually a feature request) has been considered, but will not be implemented. Generally speaking, a developer will leave a comment as to why, or the community will come to con…
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A question about the Stack Exchange authentication process and related API methods.
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For questions relating to version 2.1 of the Stack Exchange API.
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the centralized domain used for network-wide authentication to any site in the network.
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A question tagged 'website' denotes that all or a part of the application is accessed via a web-interface.
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Accompanies [app]s written in, or [library]s meant to be used from, the Python programming language
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Questions about whether [app]s with certain functionality exist. Some members of the community may react to these questions by creating those [app]s, should they not exist.
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Accompanies [app]s written in, or [library]s meant to be used from, the C# programming language
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A question about how the API returns users.
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Questions about / scripts that mess around with Stack Exchange Chat.
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Google's software stack for mobile devices. Please use the Android-specific tags such as [android-intent], not [intent]. For non-developer questions, see http://android.stackexchange.com
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For *either* meta questions about Stack Apps, or about how per-site metas are exposed by the API. (Stack Apps is its own meta site)
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Questions about the registration, management, and usage of API keys.
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Questions handling comments using the API. Or, posts of Scripts / Apps / Libraries that facilitate dealing with comments on Stack Exchange sites.
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A tip for developers working with the Stack Exchange API.
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Accompanies [app]s written in, or [library]s meant to be used from, the Java programming language