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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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/q/7/ for more info…
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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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Questions about the Stack Exchange API *only*. If your question concerns any other API, do not use this tag. For bugs, please (also) use the version tag, EG [api-v2.2], that the bug applies to.
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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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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.
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for questions about the Stack Exchange API version 2. First released Feb 2012.
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For questions relating to version 2.2 of the Stack Exchange API.
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Tools that help with questions, or issues with the API handling of questions.
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Question pertaining to the documentation provided with the API.
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Apps, Scripts, Libraries, Bugs, Feature-requests, or APIs that are: deprecated, no longer available/supported, or no longer relevant.
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Tools that help with user profiles/accounts, or issues with the API handling of users
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A question about the Stack Exchange authentication process and related API methods.
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Tools that help with tags, or issues with the API handling of tags.
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Questions about, or scripts/apps/libraries that enhance Stack Exchange's Chat rooms/feature.
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Questions about usage of the Stack Exchange API in client-side browser JavaScript.
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For apps that don't quite work yet, but need a registered Stack Apps post for testing. If you're following a tutorial which asks to post a placeholder app here, that's fine, but please delete it after…
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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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Apps accessible using web interfaces should use this tag. Questions about SE sites really shouldn't.
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Questions about searching via the API, typically using the /search method.
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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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User reputation as returned by the API or displayed on Stack Exchange sites
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Tools (scripts/apps/libraries) that help with answers, or issues with the API handling of answers
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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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actually due to the existing design of the system and is not considered erroneous behaviour.
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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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unless you are specifically targeting GM4 or later. .. Greasemonkey is a, now mostly busted, Firefox extension which allows you to run javascript code on specific web pages.
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Questions about the registration, management, and usage of API keys.
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An [app] that takes the form of an extension to the Google Chrome browser.
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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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For questions about either API methods for editing posts, or for tools/apps/scripts that enhance the editing experience.
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For questions relating to version 2 of OAuth, which is an open standard for authorization. See also the tag oauth.
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a userscript manager for most major browsers. It provides/executes privileged javascript that allows you to customize the way web pages look and act. **USE THIS TAG FOR ANY SCRIPT THAT…