topic Re: Read Json in Developer

Read Json

Anonymous — Tue, 12 Mar 2019 11:26:36 GMT

Hello,

I need to read a json file in the format below, but the json that the API returns is not in very common formatting. How do I transform this json into a table?

EX:
___________________________________
_trend_value || ip_trend_time || name
0 || dd/mm/yyyy || xxxxxx
0 || dd/mm/yyyy || xxxxxx
___________________________________

Json:
{
"data": [
{
"r": "D",
"cols": [
{
"i": 0,
"n": "ip_trend_value"
},
{
"i": 1,
"n": "ip_trend_time"
},
{
"i": 2,
"n": "name"
}
],
"rows": [
{
"fld": [
{
"i": 0,
"v": 5.320000171661377
},
{
"i": 1,
"v": "06-FEB-19 09:21:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.309999942779541
},
{
"i": 1,
"v": "06-FEB-19 09:22:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.309999942779541
},
{
"i": 1,
"v": "06-FEB-19 09:23:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.300000190734863
},
{
"i": 1,
"v": "06-FEB-19 09:24:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.320000171661377
},
{
"i": 1,
"v": "06-FEB-19 09:25:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.320000171661377
},
{
"i": 1,
"v": "06-FEB-19 09:26:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.320000171661377
},
{
"i": 1,
"v": "06-FEB-19 09:27:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.320000171661377
},
{
"i": 1,
"v": "06-FEB-19 09:28:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.300000190734863
},
{
"i": 1,
"v": "06-FEB-19 09:29:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
},
{
"fld": [
{
"i": 0,
"v": 5.309999942779541
},
{
"i": 1,
"v": "06-FEB-19 09:30:28.4"
},
{
"i": 2,
"v": "UDI_UT_3_601_001"
}
]
}
]
}
]
}

Re: Read Json

tonmcg — Tue, 12 Mar 2019 13:00:46 GMT

This was a bit tricky. Each row object has an array of fields that needs to be transposed so each field becomes a column in a table.

So for each row, I essentially changed the format from this:

{
  "fld": [
    {
      "i": 0,
      "v": 5.320000171661377
    },
    {
      "i": 1,
      "v": "06-FEB-19 09:21:28.4"
    },
    {
      "i": 2,
      "v": "UDI_UT_3_601_001"
    }
  ]
}

to this:

{
  "fld": [
    {
      "v1": 5.320000171661377,
      "v2": "06-FEB-19 09:21:28.4",
      "v3": "UDI_UT_3_601_001"
    }
  ]
}

Here's the Power Query M equivalent I came up with. To work for your purposes, replace the jsonText and jsonBinary steps below with your JSON source:

let
    jsonText = "{""data"":[{""r"":""D"",""cols"":[{""i"":0,""n"":""ip_trend_value""},{""i"":1,""n"":""ip_trend_time""},{""i"":2,""n"":""name""}],""rows"":[{""fld"":[{""i"":0,""v"":5.320000171661377},{""i"":1,""v"":""06-FEB-19 09:21:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.309999942779541},{""i"":1,""v"":""06-FEB-19 09:22:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.309999942779541},{""i"":1,""v"":""06-FEB-19 09:23:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.300000190734863},{""i"":1,""v"":""06-FEB-19 09:24:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.320000171661377},{""i"":1,""v"":""06-FEB-19 09:25:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.320000171661377},{""i"":1,""v"":""06-FEB-19 09:26:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.320000171661377},{""i"":1,""v"":""06-FEB-19 09:27:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.320000171661377},{""i"":1,""v"":""06-FEB-19 09:28:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.300000190734863},{""i"":1,""v"":""06-FEB-19 09:29:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]},{""fld"":[{""i"":0,""v"":5.309999942779541},{""i"":1,""v"":""06-FEB-19 09:30:28.4""},{""i"":2,""v"":""UDI_UT_3_601_001""}]}]}]}",
    jsonBinary = Text.ToBinary(jsonText),
    jsonDocument = Json.Document(jsonBinary),
    data = jsonDocument[data],
    childNode = data{0},
    cols = childNode[cols],
    ConvertedColsToTable = Table.FromList(cols, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    ExpandedColNames = Table.ExpandRecordColumn(ConvertedColsToTable, "Column1", {"n"}, {"n"}),
    colNames = ExpandedColNames[n],
    rows = childNode[rows],
    ConvertedListToTable = Table.FromList(rows, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    ExpandedListOfFields = Table.ExpandRecordColumn(ConvertedListToTable, "Column1", {"fld"}, {"fld"}),
    rowCount = Table.RowCount(ExpandedListOfFields),
    transposeRecords = (n as number) =>
        let
            fld = ExpandedListOfFields{n}[fld],
            ConvertedFldToTale = Table.FromList(fld, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
            TransposedFldTable = Table.Transpose(ConvertedFldToTale),
            ExpandedTrend = Table.ExpandRecordColumn(TransposedFldTable, "Column1", {"v"}, {"v"}),
            ExpandedTime = Table.ExpandRecordColumn(ExpandedTrend, "Column2", {"v"}, {"v.1"}),
            ExpandedName = Table.ExpandRecordColumn(ExpandedTime, "Column3", {"v"}, {"v.2"}),
            ConvertedToRecord = Table.ToRecords(ExpandedName)
        in
            ConvertedToRecord,
    listOfFields = 
        List.Generate(
            ()=>
                [
                    n = 0,
                    records = transposeRecords(n)
                ],
                each [n] < rowCount,
                each [
                    n = [n] + 1,
                    records = transposeRecords(n)
                ]
        ),
    ConvertedFldListToTable = Table.FromList(listOfFields, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    ExpandedList = Table.ExpandRecordColumn(ConvertedFldListToTable, "Column1", {"records"}, {"records"}),
    ExpandedRecords = Table.ExpandListColumn(ExpandedList, "records"),
    ExpandedFldNameValues = Table.ExpandRecordColumn(ExpandedRecords, "records", {"v", "v.1", "v.2"}, colNames)
in
    ExpandedFldNameValues

Note: this looks like the results from an Excel file on SharePoint using the Excel REST service. That service also produces an html of your Excel table. To get the html version, append $format=html to the end of the Uri.

Re: Read Json

Anonymous — Tue, 12 Mar 2019 13:26:42 GMT

Thanks for the answer
It worked very well. It really is a REST service, but I do not know the technology used, but your solution solved the problem!