npm Node output steam to pretty json to terminal-CodePudding

I want to be able to stream all the output data from when I run npm run start into pretty JSON. The issue when using jq is that some output is not JSON is there any way to pretty-print JSON from an output stream where sometimes its text and sometimes it's JSON

Example id like

[nodemon] 1.19.4
[nodemon] to restart at any time, enter `rs`
[nodemon] watching dir(s): src/**/*
[nodemon] watching extensions: ts
[nodemon] starting `ts-node ./src/index.ts index.js`
helmet deprecated helmet.noCache is deprecated and will be removed in [11:11:55] Found 0 errors. Watching for file changes.

[{"caller": "RESOURCE ACCESS","token": "","msg": "xxx","statusCode": null,"level": "info","time": "xxx"},{"endpoint": "some endpoint","msg": "Initial endpoint","data": {"campaign_id": "xxx"},"level": "info","time": "xxx"},{"msg": "Request received","endpoint": "some other endpoint","method": "GET"}]

To be formatted in the terminal like

[nodemon] 1.19.4
[nodemon] to restart at any time, enter `rs`
[nodemon] watching dir(s): src/**/*
[nodemon] watching extensions: ts
[nodemon] starting `ts-node ./src/index.ts index.js`
helmet deprecated helmet.noCache is deprecated and will be removed in [11:11:55] Found 0 errors. Watching for file changes.

[
  {
    "caller": "RESOURCE ACCESS",
    "token": "",
    "msg": "xxx",
    "statusCode": null,
    "level": "info",
    "time": "xxx"
  },
  {
    "endpoint": "some endpoint",
    "msg": "Initial endpoint",
    "data": {
      "campaign_id": "xxx"
    },
    "level": "info",
    "time": "xxx"
  },
  {
    "msg": "Request received",
    "endpoint": "some other endpoint",
    "method": "GET"
  }
]

CodePudding user response：

If your output may have JSON parts and non-JSON parts, you first need to find a way to isolate them in order to tell them apart.

For instance, if each item is on its own line (ie. all JSON parts are self-contained within their own line, then read in linewise as raw text using the --raw-input (or -R) option, check if you can convert them to JSON using the fromjson builtin and the error suppression operator ?, and if not (using the alternative operator //) output the line as is using the --raw-output (or -r option):

… | jq --raw-input --raw-output 'fromjson? // .'

Demo