I try to do a project using firebase . But i dont know how to write code to check whether a firebase tag already exist or not in my firebase realtime database?

MIT App Inventor Help
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Please help me .It is students project.

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Run the Firebase GetTags block

Iterate over the value returned (it will be a list) and test if the tag you are looking for is there.

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blocks (1)

Isn’t that what the valueIfTagNotThere input is for?

When the value arrives, check it against your unlikely missing value.
blocks

(I assume you will never ever use ‘Zipittydoodah’ in your data.)

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thanks dear