How to interpret the json file obtained after converting it from grib2 format for weather data?

Question

I download weather data from http://nomads.ncep.noaa.gov/ here it was in grib2 format then i used enter link description here utility to convert it to json format now my data looks like this :

[
{
    "header":{
        "discipline":0,
        "disciplineName":"Meteorological products",
        "gribEdition":2,
        "gribLength":12303,
        "center":7,
        "centerName":"US National Weather Service - NCEP(WMC)",
        "subcenter":2,
        "refTime":"2018-06-19T00:00:00.000Z",
        "significanceOfRT":1,
        "significanceOfRTName":"Start of forecast",
        "productStatus":0,
        "productStatusName":"Operational products",
        "productType":4,
        "productTypeName":"Perturbed Forecast products",
        "productDefinitionTemplate":11,
        "productDefinitionTemplateName":"Individual ensemble forecast in a time interval",
        "parameterCategory":1,
        "parameterCategoryName":"Moisture",
        "parameterNumber":8,
        "parameterNumberName":"Total_precipitation",
        "parameterUnit":"kg.m-2",
        "genProcessType":11,
        "genProcessTypeName":"Unknown",
        "forecastTime":2,
        "surface1Type":1,
        "surface1TypeName":"Ground or water surface",
        "surface1Value":0.0,
        "surface2Type":255,
        "surface2TypeName":"Missing",
        "surface2Value":0.0,
        "gridDefinitionTemplate":0,
        "gridDefinitionTemplateName":"Latitude_Longitude",
        "numberPoints":10512,
        "shape":6,
        "shapeName":"Earth spherical with radius of 6,371,229.0 m",
        "gridUnits":"degrees",
        "resolution":48,
        "winds":"true",
        "scanMode":0,
        "nx":144,
        "ny":73,
        "basicAngle":0,
        "subDivisions":0,
        "lo1":0.0,
        "la1":90.0,
        "lo2":357.5,
        "la2":-90.0,
        "dx":2.5,
        "dy":2.5
    },
    "data":[
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,
        0.17,

Now I want to know how to interpret this data given latitude and longitude as input ?