JSON Prettify and Format

Prettify, format, and inspect raw or minified JSON text into clean, human-readable indented structures (2-space, 4-space, or tab). Features collapsible tree nodes, key sorting, and precise syntax error line markers.

Why Use This Tool?

• API Response Formatting: Un-minify messy single-line JSON API responses from server logs or cURL outputs.
• Syntax Error Debugging: Locate missing commas, unquoted keys, or trailing commas with line-number error highlights.
• Key Sorting & Cleanup: Alphabetically sort JSON object keys for clean diff comparisons.

How to Use

1. Paste raw or minified JSON into the editor.
2. Select Indentation (2 spaces, 4 spaces, or tab character).
3. View prettified JSON output and copy or download as `.json` file.

Real Working Example

Input:

Raw Input: {"id":1,"name":"Alice","skills":["js","ts"],"active":true}

Output Result:

Prettified Result:
{
  "id": 1,
  "name": "Alice",
  "skills": [
    "js",
    "ts"
  ],
  "active": true
}

Important Technical Details & Specifications

• JSON AST Formatting Engine: Uses `JSON.parse` and custom stringifiers to clean and format valid JSON.
• Interactive Collapsible Nodes: Click fold toggles to expand or collapse deep nested objects and arrays.
• 100% Local Browser Engine: Zero server network requests—sensitive payload data stays private.

Related Developer Tools

• JSON Minifier: Compress JSON by stripping whitespace.
• JSON Visual Tree Editor: Edit JSON in an interactive tree view.
• JSON Schema Validator: Validate JSON against schemas.