hash to name,How do I do that

We can do that through lib
nameHash(“xxx.eth”) => “0xxxxxxx”
But I haven’t found any lib that does
hashToName(“0xxxxx”) => xxx.eth

How do I do that

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You cannot. Hashes are one-way.

You could attempt to look it up in the ENS subgraph, but it’s not guaranteed to have that information. Most .eth 2LD labels are in there though.