如何用jq获取数组的索引

Question

I want search this string tb1qpvtnfqqs3cp4ly4375km7n5sga8hkdkujkm854 in that structure

{
  "txid": "67bc5194442dc350312a7c0a5fc7ef912c31bf00b23349b4c3afdf177c91fb2f",
  "hash": "8392ded0647e4166eda342cee409c7d0e1e3ffab24de41866d2e6a7bd0a245b3",
  "version": 2,
  "size": 245,
  "vsize": 164,
  "weight": 653,
  "locktime": 1764124,
  "vin": [
    {
      "txid": "69eed058cbd18b3bf133c8341582adcd76a4d837590d3ae8fa0ffee1d597a8c3",
      "vout": 0,
      "scriptSig": {
        "asm": "0014759fc698313da549948940508df6db93a319096e",
        "hex": "160014759fc698313da549948940508df6db93a319096e"
      },
      "txinwitness": [
        "3044022014a8eb758063c52bc970d42013e653f5d3fb3c190b55f7cfa72680280cc5138602202a873b5cad4299b2f52d8cccb4dcfa66fa6ec256d533788f54440d4cdad7dd6501",
        "02ec8ba22da03ed1870fe4b9f9071067a6a1fda6f582c5c858644e44bd401bfc0a"
      ],
      "sequence": 4294967294
    }
  ],
  "vout": [
    {
      "value": 0.37841708,
      "n": 0,
      "scriptPubKey": {
        "asm": "0 686bc8ce41505642c96f3eb99919fff63f4c0f11",
        "hex": "0014686bc8ce41505642c96f3eb99919fff63f4c0f11",
        "reqSigs": 1,
        "type": "witness_v0_keyhash",
        "addresses": [
          "tb1qdp4u3njp2pty9jt086uejx0l7cl5crc3x3phwd"
        ]
      }
    },
    {
      "value": 0.00022000,
      "n": 1,
      "scriptPubKey": {
        "asm": "0 0b173480108e035f92b1f52dbf4e90474f7b36dc",
        "hex": "00140b173480108e035f92b1f52dbf4e90474f7b36dc",
        "reqSigs": 1,
        "type": "witness_v0_keyhash",
        "addresses": [
          "tb1qpvtnfqqs3cp4ly4375km7n5sga8hkdkujkm854"
        ]
      }
    }
  ],
  "hex": "02000000000101c3a897d5e1fe0ffae83a0d5937d8a476cdad821534c833f13b8bd1cb58d0ee690000000017160014759fc698313da549948940508df6db93a319096efeffffff022c6b410200000000160014686bc8ce41505642c96f3eb99919fff63f4c0f11f0550000000000001600140b173480108e035f92b1f52dbf4e90474f7b36dc02473044022014a8eb758063c52bc970d42013e653f5d3fb3c190b55f7cfa72680280cc5138602202a873b5cad4299b2f52d8cccb4dcfa66fa6ec256d533788f54440d4cdad7dd65012102ec8ba22da03ed1870fe4b9f9071067a6a1fda6f582c5c858644e44bd401bfc0a1ceb1a00",
  "blockhash": "000000009acb8b4f06a97beb23b3d9aeb3df71052dabec94465933b564c27f50",
  "confirmations": 2,
  "time": 1591687001,
  "blocktime": 1591687001
}

I'd like to get the index of vout, in this case 1. is it possible with jq?

Answer 1

The following assumes that you want the index in.vout of the first object which has the given string as a leaf value, and that you have in mind using 0 as the index origin.

A simple and reasonably efficient jq program that finds all such indices is as follows:

.vout
| range(0;length) as $i
| if any(.[$i]|..;
         . == "tb1qpvtnfqqs3cp4ly4375km7n5sga8hkdkujkm854") 
  then $i 
  else empty
  end

With the given input, this in fact yields 1, which is in accordance with the problem description, so we seem to be on right track.

To get the first index, you could wrap the above in first(...) , but in that case the result would be the empty stream if there is no occurrence. So perhaps you would prefer to wrap the above in first(...) // null

Answer 2

It's not clear what exactly you want.

I guess you want the n of the element of vout that contains the given address in its addresses list. That can be achieved with

jq '.vout[]
    | select(.scriptPubKey.addresses[] == "tb1qpvtnfqqs3cp4ly4375km7n5sga8hkdkujkm854")
    | .n
   ' file.json

You can also use

select((.scriptPubKey.addresses[]
    | contains("tb1qpvtnfqqs3cp4ly4375km7n5sga8hkdkujkm854")))

to search for the address.