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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Use this ONLY to LIST or ANNOUNCE your application; and ONLY if that application either uses the Stack Exchange API or works on any of the Stack Exchange websites. ... See stackapps.com/questions/7/ f…
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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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designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
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A question about the Stack Exchange API: usage, functioning, guidelines, etc.
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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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indicates a proposal for a new feature for the Stack Exchange API, or a change to an existing feature.
× 220
for questions about the Stack Exchange API version 2.
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A question about how the API returns questions.
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Question about any of the API methods that return, in some form, information about tags.
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Question pertaining to the documentation provided with the API.
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Questions about usage of the Stack Exchange API in client-side browser JavaScript.
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A question about how the API returns users.
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For questions relating to version 2.2 of the Stack Exchange API.
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A question about the Stack Exchange authentication process and related API methods.
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Questions about the built-in API **HELP PAGES** at api.stackexchange.com/docs. For issues with the API itself, use the [api] tag, not this tag.
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A question about how the API returns reputation for users.
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actually due to the existing design of the system and is not considered erroneous behaviour.
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Apps accessible using web interfaces should use this tag. Questions about SE sites really shouldn't.
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For apps that don't quite work yet, but need a registered Stack Apps post for testing.
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Questions about / scripts that mess around with Stack Exchange Chat.
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to POST, or announce, libraries which provide access to the Stack Exchange API and/or Stack exchange sites. The body of the question will give usage examples, as well as source and licen…
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Questions about searching via the API, typically using the /search method.
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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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A question about how the API returns answers.
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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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An [app] that takes the form of an extension to the Google Chrome browser.
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For questions relating to version 2.1 of the Stack Exchange API.
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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 Firefox add-on, which allows you to run JavaScript code on specific web pages, as defined in a User Script.
× 36
Questions about: throttling, the `backoff` flag, the quotas, or the rate limiting of requests made to the API. API calls are restricted both by per-second rates and by daily quotas.
× 36
the centralized domain used for network-wide authentication to any site in the network.
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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 handling comments using the API. Or, posts of Scripts / Apps / Libraries that facilitate dealing with comments on Stack Exchange sites.
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Accompanies [app]s written in, or [library]s meant to be used from, the C# programming language