Since you have tagged your question with flask, this post assumes you are using Python as well. To format your database values in JSON string, you can query the db and then use recursion:
import sqlite3, collections
d = list(sqlite3.connect('file.db').cursor().execute("select * from values"))
def get_tree(vals):
_d = collections.defaultdict(list)
for a, *b in vals:
_d[a].append(b)
return [{'name':a, **({} if not (c:=list(filter(None, b))) else {'children':get_tree(b)})} for a, b in _d.items()]
import json
print(json.dumps(get_tree(d), indent=4))
Output:
[
{
"name": "AA",
"children": [
{
"name": "BB",
"children": [
{
"name": "EE",
"children": [
{
"name": "JJ",
"children": [
{
"name": "EEV"
},
{
"name": "FFW"
}
]
},
{
"name": "KK",
"children": [
{
"name": "HHX"
}
]
}
]
}
]
},
{
"name": "CC",
"children": [
{
"name": "FF",
"children": [
{
"name": "LL",
"children": [
{
"name": "QQY"
}
]
},
{
"name": "MM",
"children": [
{
"name": "RRV"
}
]
}
]
},
{
"name": "GG",
"children": [
{
"name": "NN",
"children": [
{
"name": "SSW"
}
]
}
]
}
]
},
{
"name": "DD",
"children": [
{
"name": "HH",
"children": [
{
"name": "OO",
"children": [
{
"name": "TTZ"
}
]
}
]
},
{
"name": "II",
"children": [
{
"name": "PP",
"children": [
{
"name": "UUW"
}
]
}
]
}
]
}
]
}
]
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