JSON, YAML & XML Formatter

Validate, prettify, and debug structured data instantly.

Ready to validate and format.

Input

Formatted Output

Run validation to see formatted output here.

Why use this formatter?

Use this online formatter to clean structured payloads before debugging API requests, config files, and data exports.

Supported formats

JSON validation with pretty print, YAML parsing with indentation, and XML syntax checks with formatted output.

Common Formatting Errors

Invalid JSON token

Check commas, quotes, and trailing commas in objects or arrays.

YAML indentation issue

Use consistent spaces for nested keys and list items.

XML parse error

Ensure opening and closing tags match and attribute quotes are valid.

Basic Topics with Examples

Learn core formatting concepts for JSON, YAML, and XML before handling production payloads.

JSON Formatting Basics

JSON requires strict syntax. Keys and string values need double quotes, arrays use square brackets, and objects use curly braces.

{
  "user": "chandan",
  "skills": ["html", "css", "javascript"],
  "active": true
}

Key takeaway: Use strict quoting and commas correctly to avoid JSON parse errors.

YAML Key-Value Structure

YAML relies on indentation instead of braces. It is common in CI pipelines, Kubernetes files, and config documents.

app: online-compiler
version: 1.0
enabled: true
features:
  - formatter
  - regex

Key takeaway: Keep indentation consistent with spaces to prevent broken YAML structures.

XML Element and Attribute Syntax

XML uses start and end tags and can include attributes. Every opened tag must be closed correctly.

<project name="online-compiler">
  <feature type="tool">formatter</feature>
  <feature type="tool">regex</feature>
</project>

Key takeaway: Always match opening and closing tags for valid XML parsing.

Copy-Paste API Payload Cleanup

Incoming payloads from APIs are often minified. Formatter tools help make them readable for debugging and team reviews.

{"id":12,"name":"Demo","roles":["admin","editor"],"meta":{"country":"IN"}}

Key takeaway: Formatting payloads first helps you debug faster and avoid missing nested keys.

Advanced Topics with Examples

Apply structured validation practices for larger, nested, and integration-heavy data workflows.

Nested Object Validation Workflow

Complex objects can hide subtle structure errors. Validate each layer from top-level keys to deeply nested arrays.

{
  "order": {
    "id": "A100",
    "items": [
      { "sku": "P1", "qty": 2 },
      { "sku": "P2", "qty": 1 }
    ]
  }
}

Key takeaway: Inspect nested paths step by step instead of scanning entire payload at once.

YAML Lists and Nested Maps

Advanced YAML often combines lists and maps. Proper indentation and grouping are critical for deployment configs.

services:
  web:
    image: nginx
    ports:
      - "80:80"
  api:
    image: node:20
    environment:
      NODE_ENV: production

Key takeaway: Visual hierarchy in YAML is logic hierarchy; one indentation mistake changes meaning.

XML Namespaces and Structure Consistency

In larger XML documents, namespaces and consistent node hierarchy reduce conflicts and parsing ambiguity.

<ns:catalog xmlns:ns="https://example.com/schema">
  <ns:item id="1">
    <ns:name>Formatter</ns:name>
  </ns:item>
</ns:catalog>

Key takeaway: Namespaces are useful when integrating XML from multiple providers.

Validation Before Database Insert

Before writing imported payloads to a database, format and validate structure to catch malformed fields early.

{
  "importedAt": "2026-02-23T10:00:00Z",
  "records": [
    { "id": 1, "status": "ok" },
    { "id": 2, "status": "ok" }
  ]
}

Key takeaway: Formatted validation saves downstream cleanup and prevents data integrity issues.

Free Online Code Formatter & Beautifier

Our online code formatter automatically beautifies and formats your HTML, CSS, and JavaScript code. Whether you've copied code from the internet, minified code that's hard to read, or code with inconsistent indentation, our formatter cleans it up instantly. Make your code more readable, maintainable, and professional-looking with automatic formatting applied in seconds.

What Does Our Formatter Do?

✨ Auto Indentation

Automatically fixes indentation and spacing. Nested elements are properly aligned, making code structure immediately visible and easier to understand.

📋 Minified to Pretty

Convert minified code into readable formatted code. Remove all obfuscation and make minified JavaScript, CSS, or HTML humanly readable again.

🎨 Consistent Style

Apply consistent formatting rules across your entire file. Uniform spacing, line breaks, and bracket placement make code look professional and maintainable.

Supported Languages

HTML - Format HTML markup with proper tag indentation and attribute alignment
CSS - Beautify stylesheets with consistent property formatting and organization
JavaScript - Format JS code with proper indentation, spacing, and line breaks

Why Use a Code Formatter?

Readability - Well-formatted code is easier to read and understand, reducing bugs and debugging time
Collaboration - Team members can quickly understand code formatted in a consistent style
Professionalism - Proper formatting shows code quality and attention to detail in your projects
Maintenance - Formatted code is easier to modify, update, and maintain over time
Debugging - Clear structure helps identify syntax errors and logic issues faster

How to Use the Formatter

Step 1: Paste or type your HTML, CSS, or JavaScript code into the editor on the left

Step 2: Press the "Format" button or select your language from the dropdown

Step 3: View the beautifully formatted code on the right side instantly

Step 4: Copy the formatted code and use it in your projects

Perfect For

Formatting code copied from tutorials or documentation
Making minified code readable for debugging and understanding
Applying consistent formatting to legacy or poorly formatted code
Preparing code for team review with professional formatting
Learning proper code formatting standards and best practices
Formatting code before pasting into emails, documents, or presentations