How to convert JSON object keys as string format [duplicate]

Question

There is an JSON object I have:

{
  "inputs": {
    "country": "TR",
    "isActive": true,
    "person": {
      "fullName": "Şeref Can Muştu"
    }
  }
}

I want this JSON object like this:

{
    "inputs.country": "TR",
    "inputs.isActive": true,
    "inputs.person.fullName": "Şeref Can Muştu"
}

Is there an easiest way to make it with lodash or any most common library or just an easy method which is usable ?

I wouldn't think this is a common enough thing to warrant a lodash function. It's more of a use case for a tree walking algorithm. — Taplar
– Taplar, Commented Jun 8, 2020 at 22:55
@StackSlave I have to get them as string format. It is necessary for an API which uses Mongo. Vice versa, It updates and overrides whole object. — canmustu
– canmustu, Commented Jun 8, 2020 at 23:06
Found this: w3resource.com/javascript-exercises/fundamental/… (also, there's no such thing as a JSON object, JSON is a text format similar to/based on JS object literals) — user5734311
– user5734311, Commented Jun 8, 2020 at 23:11

user120242 · Accepted Answer · 2020-06-08 23:07:58Z

1

flatMap to merge, recursively build key string in dotkey parameter, emit [dotkey, value] when non-object is found.
Object.fromEntries to merge into one object map.

data={
  "inputs": {
    "country": "TR",
    "isActive": true,
    "person": {
      "fullName": "Şeref Can Muştu"
    }
  }
}


walk = (node, dotkey) => 
   Object.entries(node).flatMap(([key,value]) =>
     typeof value === 'object' ?
       walk(value, (typeof dotkey !== 'undefined' ? dotkey + '.' : '') + key) :
       [[dotkey+'.'+key,value]])

console.log(
Object.fromEntries(walk(data))
)

answered Jun 8, 2020 at 23:07

user120242

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1 Comment

user120242 Over a year ago

If you want invalid property accessor keys to use bracket notation (eg: obj.prop1['key ; "\'invalid']) use a regex to scan the key and escape it)

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