Nocturnal Pajama Mutants


    1.0.2 • Public • Published


    node.js library to write a tree hierarchy for console output.

    Build Status codecov Maintainability

    The why

    When writing another library I was working with a deep hierarchy of objects that I had to verify.

    I iterated the objects and wrote some metadata using space for indenting the lines. But as the hierarchy became more complex it was difficult to follow.

    So I wrote a little helper function that could take an array of objects and create a treeview-like experience, making it a lot easer to see the actual structure.


    Then I decided it was an excellent little function to share with everyone.


    npm install text-treeview

    Basic usage

    var tree = require('text-treeview');
            text : "Girls",
            children : [
            text : "Boys",
            children : [

    Will give you the result:

    ├─ Girls
    │  ├─ Anna
    │  ├─ Lisa
    │  └─ Bea
    └─ Boys
       ├─ Kalle
       ├─ Åre
       └─ Asgar

    Tree array

    Each item in the array must be either a string, or an object with a text property. You can also use the optional children property for an object to add child nodes to the item.

    The following snippets will yield identical results:

        { text : "Hello" },
        { text : "Hej" },
        { text : "Hohejoj" }


    Each child item follow the same pattern. A string or the object described above.

         text : "Some items",
         children : [
          "Item 1", 
          "Item 2",
           text : "Item 3",
           children : [ "Item 3.1", "Item 3.2"]

    will give the result

    └─ Some items
       ├─ Item 1
       ├─ Item 2
       └─ Item 3
          ├─ Item 3.1
          └─ Item 3.2


    You pass the options object as the second parameter. These are only a few options and these are the the default ones.

     showRootLines : true,
     format : (indents, treeNode, node) => {
        return `${indents.join('')}${treeNode}${node.text}\n`;
    • Set showRootLines to false to remove the lines on the root level
    • Use format to customize each node. See details below.

    format function

    format (indents, treeNode, node, parentNode) The format function will create each node and will take four parameters

    • indents is an array of each treeview "indent" that will build the treeview.
      • This array contains all the node indicators further up the tree that other levels and nodes in the tree has created.
      • These are either a NODE or EMPTY SPACE . These should be joined toghether and put in front of the string.
    • treeNode is the actual node indicator for the current node (this is are either a LEAF_NODE (├─ ) or END NODE (└─ ).
    • node is the node object
    • parentNode is the parent node of the current node

    The default function simply looks exactly like this:

    function format(indents, treeNode, node) {
        return `${indents.join('')}${treeNode}${node.text}\n`;

    Change log

    • 2021-11-03 - Changed test library and cleaned up references


    npm i text-treeview

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