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NanoJSON

A lightweight JSON editor built with pure JavaScript and native APIs. It features visual editing, dynamic type switching, and file import/export capabilities. Suitable for website embedding and JSON data editing.

This project transitioned to MIT license on 2025/07/06, with .git-crypt encryption fully removed.

Key Features

No Third-Party Dependencies

Developed using native DOM APIs without any third-party dependencies, making it easy to integrate into any web project.

Visual JSON Editing Experience

Displays JSON data in a tree structure, supporting folding/unfolding, dynamic node addition/removal, and providing an intuitive editing interface.

Comprehensive Type Support

Supports five JSON data types (string, number, boolean, array, object) with real-time type switching while maintaining data integrity.

Installation

Install via npm

npm install @pardnchiu/nanojson

Include via CDN

UMD Version

<script src="https://cdn.jsdelivr.net/npm/@pardnchiu/nanojson@[VERSION]/dist/NanoJSON.js"></script>

ES Module Version

import { JSONEditor } from "https://cdn.jsdelivr.net/npm/@pardnchiu/nanojson@[VERSION]/dist/NanoJSON.esm.js";

Initialization

// Basic initialization
const editor = new JSONEditor({
  id: "json-editor-container",    // Element ID
  title: "JSON Editor",           // Editor title
  description: "Edit your JSON",  // Editor description
  fill: true,                     // Fill parent container
  json: {                         // Initial JSON data
    name: "NanoJSON",
    version: "0.3.4",
    features: ["Lightweight", "Pure JS", "Visual Editing"]
  }
});

// Advanced configuration
const advancedEditor = new JSONEditor({
  id: "advanced-editor",
  title: "Advanced JSON Editor",
  description: "Full-featured JSON editor",
  fill: 1,                        // Fill container (1 = true, 0 = false)
  button: {                       // Button configuration
    import: true,                 // File import
    export: true,                 // File export
    reset: true                   // Reset editor
  },
  when: {                         // Lifecycle callbacks
    rendered: () => {
      console.log("Editor rendered");
    },
    updated: () => {
      console.log("Editor content updated");
    }
  }
});

// Initialize from file
const fileEditor = new JSONEditor({
  id: "file-editor",
  path: "/data/sample.json",      // Load from URL
  // file: fileInput.files[0],    // Load from file object
});

Configuration Overview

const config = {
  id: "container-id",       // Target container element ID
  title: "",                // Editor title (default: "")
  description: "",          // Editor description (default: "")
  readonly: 0,              // Read-only mode (default: 0)
  fill: 1,                  // Fill parent container (default: 1)
  json: {},                 // Initial JSON data object
  file: null,               // File object (for file upload)
  path: "",                 // JSON file URL path
  button: {                 // Button toggles
    import: true,           // File import button (default: true)
    export: true,           // File export button (default: true)
    reset: true             // Reset button (default: true)
  },
  when: {                   // Lifecycle events
    beforeRender: null,     // Before render
    rendered: null,         // After render
    beforeUpdate: null,     // Before update
    updated: null,          // After update
    beforeDestroy: null,    // Before destroy
    destroyed: null         // After destroy
  }
};

Editor Features

Data Types

String

// Text input editing
"Hello World"

Number

// Numeric input, automatically filters non-numeric characters
42
3.14159
-123

Boolean

// Dropdown selection
true
false

Array

// Supports nested structures, add/remove elements
[
  "item1",
  "item2", 
 123,
 true,
 {
   "nested": "object"
 }
]

Object

// Supports nested structures, add/remove properties
{
  "key1": "value1",
  "key2": 456,
  "nested": {
    "deep": "value"
  }
}

Available Functions

• Get JSON Data

  const jsonString = editor.json;  // Get formatted JSON string
  console.log(jsonString);

• Import Data

  // Import from object
  await editor.import({
    name: "New Data",
    version: "1.0.0"
  });
  
  // Import from file
  const fileInput = document.querySelector('input[type="file"]');
  await editor.import(fileInput.files[0]);
  
  // Import from URL
  await editor.import('/path/to/data.json');

• Export File

  editor.export();  // Automatically download JSON file

• Reset Editor

  editor.reset();   // Clear all content

• Add Root Node

  editor.insert();  // Add an empty root node

• Re-render

  editor.render();  // Force re-render the editor

• Enable Editing Mode

  editor.enable();

• Set Read-Only Mode

  editor.disable();

Lifecycle

const editor = new JSONEditor({
  id: "editor",
  when: {
    beforeRender: () => {
      console.log("About to render");
      // Return false to prevent rendering
    },
    rendered: () => {
      console.log("Render complete");
      // Post-initialization handling
    },
    beforeUpdate: () => {
      console.log("About to update content");
      // Return false to prevent update
    },
    updated: () => {
      console.log("Content updated");
      // Post-update handling, e.g., sync to server
    },
    beforeDestroy: () => {
      console.log("About to destroy editor");
    },
    destroyed: () => {
      console.log("Editor destroyed");
    }
  }
});

File Handling Mechanism

Supported Formats

• Only .json file format supported
• Automatically validates JSON syntax correctness

Export Functionality

• Automatically formats JSON (4-space indentation)
• File naming format: JSONEditor-{timestamp}.json

License

This project is licensed under MIT.

Star

Author

邱敬幃 Pardn Chiu

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©️ 2025 邱敬幃 Pardn Chiu