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.

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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
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Apps that provide notifications of things happening.
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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.
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Indicates that the issue will be reviewed in the future, or that a change in functionality is being delayed until a future date.
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Questions about (user)script support, or using the API from userscripts.   If you are announcing or posting a userscript, use the "script" tag instead.
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Questions about the per-second or per-day rate limiting of requests made to the API.
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For questions relating to version 2.2 of the Stack Exchange API.
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Questions that relate to interaction with or usage of this site (Stack Apps).
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A question about how the API returns user associations.
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Questions about the creation, manipulation, and usage of Filters - which were introduced in v2.0 of the API.
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Questions about API methods that add or modify content on Stack Exchange sites. These methods must be invoked via HTTP POST.
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A question about the /inbox and related Stack Exchange API methods.
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the most frequently asked and answered questions on Stack Apps.
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Question relating to the Soapi.JS family of [library]s.
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Changes the "style" (look & feel) of a website
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