Getting the first element of json data with jq - json

Question

I'm working with Poloniex API. While using returnTicker function, the data comes like this.
curl "https://poloniex.com/public?command=returnTicker"
{
"BTC_BTS": {
"id": 14,
"last": "0.00000111",
"lowestAsk": "0.00000112",
"highestBid": "0.00000110",
"percentChange": "0.09900990",
"baseVolume": "3.12079869",
"quoteVolume": "2318738.79293715",
"isFrozen": "0",
"high24hr": "0.00000152",
"low24hr": "0.00000098"
},
"BTC_DASH": {
"id": 24,
"last": "0.00466173",
"lowestAsk": "0.00466008",
"highestBid": "0.00464358",
"percentChange": "0.02318430",
"baseVolume": "1.98111396",
"quoteVolume": "425.22973220",
"isFrozen": "0",
"high24hr": "0.00482962",
"low24hr": "0.00450482"
....
},
"USDT_GRT": {
"id": 497,
"last": "0.72811272",
"lowestAsk": "0.75999916",
"highestBid": "0.72740000",
"percentChange": "0.48594450",
"baseVolume": "133995.43411815",
"quoteVolume": "194721.36672887",
"isFrozen": "0",
"high24hr": "0.79000000",
"low24hr": "0.45000020"
},
"TRX_SUN": {
"id": 498,
"last": "500.00000000",
"lowestAsk": "449.99999999",
"highestBid": "100.00000000",
"percentChange": "0.00000000",
"baseVolume": "0.00000000",
"quoteVolume": "0.00000000",
"isFrozen": "0",
"high24hr": "0.00000000",
"low24hr": "0.00000000"
}
}
I want the output like this
BTC_BTS : 14 : 0.00000111 : 0.00000112 : 0.00000110 : 0.09900990 : 3.12079869 : 2318738.79293715 : 0 : 0.00000152 : 0.00000098
...
USDT_GRT : 497 : 0.72428700 : 0.75999958 : 0.72630001 : 0.47813685 : 133968.74968533 : 194695.96886712 : 0 : 0.79000000 : 0.45000020
TRX_SUN : 498 : 500.00000000 : 449.99999999 : 100.00000000 : 0.00000000 : 0.00000000 : 0.00000000 : 0 : 0.00000000 : 0.00000000
I am using jq and my problem is accesing the currency pair name.
I could do this;
14 : 0.00000111 : 0.00000112 : 0.00000110 : 0.09900990 : 3.12079869 : 2318738.79293715 : 0 : 0.00000152 : 0.00000098
...
497 : 0.72428700 : 0.75999958 : 0.72630001 : 0.47813685 : 133968.74968533 : 194695.96886712 : 0 : 0.79000000 : 0.45000020
498 : 500.00000000 : 449.99999999 : 100.00000000 : 0.00000000 : 0.00000000 : 0.00000000 : 0 : 0.00000000 : 0.00000000
by using this command;
curl "https://poloniex.com/public?command=returnTicker" |jq -r | jq '.[] | (.id|tostring) + " : " + (.last|tostring) + " : " + (.lowestAsk|tostring) + " : " + (.highestBid|tostring) + " : " + (.percentChange|tostring) + " : " + (.baseVolume|tostring) + " : " + (.quoteVolume|tostring) + " : " + (.isFrozen|tostring) + " : " + (.high24hr|tostring) + " : " + (.low24hr|tostring)'|jq -r
not only this, in every jq pipeline, I cant access the first element of json
I am not meaning the |jq .BTC_BTS or |jq .USDT_GRT pipeline.
|jq . gives whole json, |jq .[] gives the sub elements after the first element.
How can i access the first path?
By the way, I may have written stupid and long pipeline with jq. If you have any idea to convert whole json to a row-column data, I am open to your ideas.
Thank you all for your answers.

Answer 1

To be safe, it might be better not to assume that the ordering of the keys is the same in all the inner objects. Ergo:
keys_unsorted as $outer
| (.[$outer[0]] | keys_unsorted) as $keys
| $outer[] as $k
| [ $k, .[$k][$keys[]] ]
| join(" : ")

Answer 2

I think this does what you want.
curl -s "https://poloniex.com/public?command=returnTicker" | \
jq -r 'to_entries
| .[]
| [ .key, (.value | to_entries | .[] | .value) ]
| join(" : ")'
In a nutshell, put everything in an array and use join to produce the desired output.
Update
As luciole75w notes, my solution has too many steps. This is better.
jq -r 'to_entries[] | [ .key, .value[] ] | join(" : ")'
That said, I would use peak's solution. Mine does not guarantee that the columns are the same for each line.