How to find depth of nodes in a nested json file?

If anyone else came here and found that the accepted answer does not work because Object.keys() for a string returns an array of each character of string and thus for either large objects or objects with large strings it just fails. Here is something that works ->

function getDepth(obj){
    if(!obj || obj.length===0 || typeof(obj)!=="object") return 0;
    const keys = Object.keys(obj);
    let depth = 0;
    keys.forEach(key=>{
        let tmpDepth = getDepth(obj[key]);
        if(tmpDepth>depth){
            depth = tmpDepth;
        }
    })
    return depth+1;
}

Exmaple - https://jsfiddle.net/95g3ebp7/

Try the following function:

 const getDepth = (
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  obj: Record<string, any>,
  tempDepth?: number
): number => {
  let depth = tempDepth ? tempDepth : 0;
  if (obj !== null) {
    depth++;
    if (typeof obj === 'object' && !Array.isArray(obj)) {
      const keys = Object.keys(obj);
      if (keys.length > 0)
        depth = Math.max(
          ...keys.map((key) => {
            return getDepth(obj[key], depth);
          })
        );
    } else if (Array.isArray(obj)) {
      if (obj.length > 0)
        depth = Math.max(
          ...obj.map((item) => {
            return getDepth(item, depth);
          })
        );
    }
  }
  return depth;
};

If you try this, I believe you have to get 7.

  console.log(getDepth({
    a: {
      b: { a: [{ a: { a: [] } }] }
    }
  }));