Get the length of the unstructures json array

[shreyas_darwhatkar]

have below json below docs = “Records” :[ “{“a”:“770959028”, “b”:“099898”, “c”:“load-generator-span”, “d”:{“random”:”",“randomtext”:"" }}\n", “{“a”:“770959028”, “b”:“099898”, “c”:“load-generator-span”, “d”:{“random”:”",“randomtext”:"" }}\n", “{“a”:“770959028”, “b”:“099898”, “c”:“load-generator-span”, “d”:{“random”:”",“randomtext”:"" }}\n", “{“a”:“770959028”, “b”:“099898”, “c”:“load-generator-span”, “d”:{“random”:”",“randomtext”:"" }}\n"]}

so I have unmarshall the above string using the json.Unmarshal([]byte(docs), &result) result is map like var result map[string]interface{}

now I can get the all the result[Records] but how can get the length of result[Records], the len function doesn’t work on this it gives me error like invalid argument for len. Is there any better function I can use.

[NobbZ (Norbert Melzer)]

As your code isn’t properly formatted, it is hard to say how your actual JSON looks like or to what go value it might be parsed.

Though if you have a map[string]interface{} and know that for a given key, you have a slice of data, then you can get that slice as slice using a type assertion:

var result map[string]interface{}

json.Unmarshall([]byte(jsonInput), &result)

records, ok := result["Records"].([]interface{})
if !ok { panic("Not a slice") }

count := len(records)

[shreyas_darwhatkar]

@NobbZ

var result map[string]interface{} json.Unmarshall(byte(jsonInput), &result) records, ok := result[“Records”].(interface{}) if !ok { panic(“Not a slice”) } count := len(records)

thanks a lot.