Best Free Online Code Formatters and Beautifiers in 2026: JSON, SQL, HTML, CSS, and More | Akousa

json

{
  "users": [
    {
      "id": 1,
      "name": "Alice",
      "roles": ["admin", "editor"],
      "settings": { "theme": "dark", "notifications": { "email": true, "push": false } }
    },
    {
      "id": 2,
      "name": "Bob",
      "roles": ["viewer"],
      "settings": { "theme": "light", "notifications": { "email": false, "push": true } }
    }
  ],
  "pagination": { "page": 1, "total": 2 }
}

json

{
  "users": [
    {
      "id": 1,
      "name": "Alice",
      "roles": ["admin", "editor"],
      "settings": {
        "theme": "dark",
        "notifications": {
          "email": true,
          "push": false
        }
      }
    },
    {
      "id": 2,
      "name": "Bob",
      "roles": ["viewer"],
      "settings": {
        "theme": "light",
        "notifications": {
          "email": false,
          "push": true
        }
      }
    }
  ],
  "pagination": {
    "page": 1,
    "total": 2
  }
}

sql

SELECT u.id, u.name, u.email, o.id as order_id, o.total, p.name as product_name, oi.quantity FROM users u INNER JOIN orders o ON u.id = o.user_id INNER JOIN order_items oi ON o.id = oi.order_id INNER JOIN products p ON oi.product_id = p.id WHERE o.status IN ('completed', 'shipped') AND o.created_at >= '2025-01-01' GROUP BY u.id, u.name, u.email, o.id, o.total, p.name, oi.quantity ORDER BY o.created_at DESC LIMIT 100;

sql

SELECT
    u.id,
    u.name,
    u.email,
    o.id AS order_id,
    o.total,
    p.name AS product_name,
    oi.quantity
FROM
    users u
    INNER JOIN orders o
        ON u.id = o.user_id
    INNER JOIN order_items oi
        ON o.id = oi.order_id
    INNER JOIN products p
        ON oi.product_id = p.id
WHERE
    o.status IN ('completed', 'shipped')
    AND o.created_at >= '2025-01-01'
GROUP BY
    u.id, u.name, u.email,
    o.id, o.total, p.name, oi.quantity
ORDER BY
    o.created_at DESC
LIMIT 100;

html

<div class="container">
  <header>
    <nav>
      <ul class="nav-list">
        <li><a href="/" class="active">Home</a></li>
        <li><a href="/about">About</a></li>
        <li class="dropdown">
          <a href="/services">Services</a>
          <ul class="dropdown-menu">
            <li><a href="/services/web">Web</a></li>
            <li><a href="/services/mobile">Mobile</a></li>
          </ul>
        </li>
      </ul>
    </nav>
  </header>
  <main>
    <section class="hero">
      <h1>Welcome</h1>
      <p>We build great things.</p>
    </section>
  </main>
</div>

html

<div class="container">
  <header>
    <nav>
      <ul class="nav-list">
        <li>
          <a href="/" class="active">Home</a>
        </li>
        <li>
          <a href="/about">About</a>
        </li>
        <li class="dropdown">
          <a href="/services">Services</a>
          <ul class="dropdown-menu">
            <li>
              <a href="/services/web">Web</a>
            </li>
            <li>
              <a href="/services/mobile">Mobile</a>
            </li>
          </ul>
        </li>
      </ul>
    </nav>
  </header>
  <main>
    <section class="hero">
      <h1>Welcome</h1>
      <p>We build great things.</p>
    </section>
  </main>
</div>

css

.card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem;
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.card .title {
  font-size: 1.25rem;
  font-weight: 600;
}
@media (min-width: 768px) {
  .card {
    flex-direction: row;
  }
  .card .title {
    font-size: 1.5rem;
  }
}

css

.card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem;
  border-radius: 0.5rem;
  background: var(--card-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s;
}
 
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
 
.card .title {
  font-size: 1.25rem;
  font-weight: 600;
}
 
@media (min-width: 768px) {
  .card {
    flex-direction: row;
  }
 
  .card .title {
    font-size: 1.5rem;
  }
}

javascript

const fetchUsers = async (page = 1, limit = 20) => {
  try {
    const res = await fetch(`/api/users?page=${page}&limit=${limit}`);
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    const { users, total } = await res.json();
    return {
      users: users.map((u) => ({
        ...u,
        fullName: `${u.firstName} ${u.lastName}`,
        isActive: u.lastLogin > Date.now() - 86400000,
      })),
      total,
      pages: Math.ceil(total / limit),
    };
  } catch (err) {
    console.error("Failed:", err);
    return { users: [], total: 0, pages: 0 };
  }
};

javascript

const fetchUsers = async (page = 1, limit = 20) => {
  try {
    const res = await fetch(`/api/users?page=${page}&limit=${limit}`);
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    const { users, total } = await res.json();
    return {
      users: users.map((u) => ({
        ...u,
        fullName: `${u.firstName} ${u.lastName}`,
        isActive: u.lastLogin > Date.now() - 86400000,
      })),
      total,
      pages: Math.ceil(total / limit),
    };
  } catch (err) {
    console.error("Failed:", err);
    return { users: [], total: 0, pages: 0 };
  }
};

python

def process_data(data,filters=None,sort_by='created_at',ascending=True,limit=None):
    if filters is None:filters={}
    result=[item for item in data if all(item.get(k)==v for k,v in filters.items())]
    result.sort(key=lambda x:x.get(sort_by,''),reverse=not ascending)
    if limit is not None:result=result[:limit]
    return {'items':result,'count':len(result),'filters_applied':filters}

python

def process_data(
    data,
    filters=None,
    sort_by="created_at",
    ascending=True,
    limit=None,
):
    if filters is None:
        filters = {}
    result = [
        item
        for item in data
        if all(item.get(k) == v for k, v in filters.items())
    ]
    result.sort(
        key=lambda x: x.get(sort_by, ""),
        reverse=not ascending,
    )
    if limit is not None:
        result = result[:limit]
    return {
        "items": result,
        "count": len(result),
        "filters_applied": filters,
    }

xml

<?xml version="1.0"?><project><modelVersion>4.0.0</modelVersion><groupId>com.example</groupId><artifactId>my-app</artifactId><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>3.2.0</version></dependency><dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId><scope>runtime</scope></dependency></dependencies></project>

xml

<?xml version="1.0"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>my-app</artifactId>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>3.2.0</version>
    </dependency>
    <dependency>
      <groupId>org.postgresql</groupId>
      <artifactId>postgresql</artifactId>
      <scope>runtime</scope>
    </dependency>
  </dependencies>
</project>

Format	Beautified	Minified	Savings
JSON (API response)	2,400 B	1,600 B	33%
CSS (component library)	45,000 B	31,000 B	31%
JavaScript (utility)	12,000 B	7,200 B	40%
HTML (landing page)	18,000 B	13,500 B	25%

Why Code Formatting Actually Matters

Your Brain Reads Structure, Not Characters

Formatting Catches Bugs

Teams Need Consistency

JSON Formatting: The One You Use Most

Before and After

SQL Formatting: Where Readability Is a Safety Issue

Before and After

SQL Formatting Conventions

HTML Beautification: Taming the Tag Soup

Before and After

CSS Formatting: More Than Just Indentation

Before and After

JavaScript Beautification: Unminifying the Web

Before and After

Python Formatting: Black, PEP 8, and Opinionated Style

XML Formatting: Still Very Much Relevant

Before and After

YAML Formatting: Where Whitespace Is Everything

Minification vs. Beautification

When to Beautify

When to Minify

The Formatting Standards Ecosystem

Prettier (Web)

Black (Python)

gofmt and rustfmt

EditorConfig

Validating While Formatting

Formatting API Responses: A Daily Workflow

Beyond API Responses

Browser DevTools Limitations

IDE vs. Online Formatters: When to Use Which

Use Your IDE When:

Use an Online Formatter When:

Terminal Formatting Shortcuts

Formatting Config Files: The Meta Problem

Common Formatting Mistakes

Beyond Basic Formatting: Features That Matter

Handling Large Files

Start Formatting

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