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Free Online Code Formatters: JSON, XML, CSS, SQL and More

A developer's guide to online code formatting tools — what each formatter does, when to use it, and why formatting matters for code quality and collaboration.

8 min read way2pdf Team

Why Code Formatting Matters

Unformatted code is difficult to read, harder to debug, and nearly impossible to review in a team context. Code formatting — consistently applying indentation, line breaks, and spacing — has no effect on how the code executes, but it has a dramatic effect on how fast a human can read and understand it.

Consider this minified JSON response from an API:

{"user":{"id":1042,"name":"Alice","roles":["admin","editor"],"settings":{"theme":"dark","notifications":true}}}

vs. the same data formatted:

{
  "user": {
    "id": 1042,
    "name": "Alice",
    "roles": ["admin", "editor"],
    "settings": {
      "theme": "dark",
      "notifications": true
    }
  }
}

The formatted version makes the structure immediately obvious. Nested objects, array members, and key-value pairs are all clear at a glance. Debugging, reviewing, and modifying formatted code is dramatically faster.

All Available Formatters on way2pdf

All formatters run entirely in your browser — your code never leaves your device. This makes them safe for proprietary source code, internal configuration files, API keys, and any sensitive developer data.

JSON Formatter

The JSON Formatter parses, validates, and beautifies JSON data with 2-space indentation. It catches syntax errors (missing commas, trailing commas, single-quoted strings) and reports the exact error location. Also includes a minify option to produce production-ready compact JSON.

Best for: Inspecting API responses, debugging configuration files, validating JSON before submitting to an API, reading database exports.

XML Formatter

The XML Formatter uses the browser's native DOMParser to validate and format XML with proper indentation. Invalid XML is caught immediately. Includes a minify option that strips comments and whitespace for production use.

Best for: SOAP API responses, configuration files (Maven pom.xml, .NET app.config), RSS feeds, SVG source, Office Open XML inspection.

HTML Formatter

The HTML Formatter indents HTML elements hierarchically, making nested structures clear. It handles self-closing tags (br, img, input, etc.) correctly and includes a minifier for production HTML.

Best for: Reviewing rendered HTML from a browser inspector, formatting email templates, debugging template output, code review.

CSS Formatter

The CSS Formatter adds proper indentation to CSS rules, placing each property on its own line with consistent spacing. The minifier removes all whitespace and comments for production deployment.

Best for: Inspecting minified third-party stylesheets, formatting CSS pasted from design tools, code review of CSS files, debugging specificity issues.

JavaScript Formatter

The JavaScript Formatter applies bracket and semicolon-aware indentation to restore readable structure to compact or minified JavaScript. Works with modern ES6+ syntax including arrow functions, template literals, and async/await.

Best for: Inspecting minified library code, reading compiled output from bundlers, formatting quick scripts, code review.

SQL Formatter

The SQL Formatter uppercases SQL keywords (SELECT, FROM, WHERE, JOIN, etc.), places each major clause on a new line, and indents AND/OR conditions for readability. Works across MySQL, PostgreSQL, SQL Server, SQLite, and other standard SQL dialects.

Best for: Formatting queries from query builders, making long stored procedures readable, code review, documentation.

YAML Formatter

The YAML Formatter normalizes YAML indentation to consistent 2-space levels and validates structure for common errors like tab characters (which YAML forbids).

Best for: Docker Compose files, Kubernetes manifests, GitHub Actions workflows, Ansible playbooks, any CI/CD configuration.

Markdown Preview

The Markdown Preview renders a live HTML preview of Markdown text, converting headings, bold/italic, links, images, code blocks, lists, and blockquotes to formatted HTML.

Best for: Previewing README files, drafting documentation, checking Markdown formatting before committing, writing blog posts.

Encoding and Conversion Tools

Base64 Encode/Decode

The Base64 tool encodes any text or data to Base64 format, or decodes Base64 strings back to plain text. Handles Unicode text correctly using the proper encodeURIComponent/btoa encoding chain.

Best for: Creating data URIs for images, encoding credentials for HTTP Basic Auth headers, debugging JWT tokens (the payload is Base64-encoded), encoding binary data for JSON transport.

URL Encode/Decode

The URL Encoder/Decoder percent-encodes special characters for safe URL transmission, or decodes encoded URL strings back to readable form.

Best for: Building URL query strings with special characters, decoding logged URLs, encoding form data, debugging URL routing issues.

Text Case Converter

The Text Case Converter transforms text to UPPERCASE, lowercase, or Title Case instantly.

Best for: Normalizing data for database storage, formatting headings, preparing text for CSV imports, data cleaning pipelines.

Code Minifier

The Code Minifier auto-detects whether input is JSON, HTML, CSS, or JavaScript and applies the appropriate minification strategy. Displays the percentage size reduction and original vs. minified byte count.

Best for: Quick one-off minification without a build tool, verifying what a minifier produces, optimizing assets for deployment.

Data Formatters

CSV Viewer

The CSV Viewer parses comma-separated data and renders it as a readable HTML table with colored header rows. Shows row count and column count. Handles quoted fields and escaped commas correctly.

Best for: Spot-checking CSV exports before importing to a database, verifying CSV structure, viewing data without opening Excel.

Date/Time Formatter

The Date Formatter accepts any date string, Unix timestamp (seconds or milliseconds), or natural language date and converts it to 15 formats: ISO 8601, UTC string, locale string, Unix timestamp, individual components (year, month, day, hour), day of week, week number, and relative time ("3 days ago").

Best for: Converting timestamps in logs, debugging date storage issues, checking what a Unix timestamp represents, formatting dates for display.

Number Formatter

The Number Formatter takes any number and displays it in 14 formats: locale-formatted with commas, 2/4 decimal places, scientific notation, USD currency, EUR currency, percentage, binary, octal, hexadecimal, words ("one million two hundred..."), and KB/MB byte sizes.

Best for: Converting between number bases, checking binary/hex representations, formatting numbers for international display, understanding file sizes.

Privacy Guarantee

Every single tool on the Formatters page runs 100% in your browser. The JavaScript executes locally, and nothing is sent to a server. You can verify this by opening your browser's Network tab in Developer Tools while using any formatter — you'll see zero outgoing requests when you format code. This makes way2pdf's formatters safe for:

  • Internal API keys and tokens
  • Database credentials in config files
  • Proprietary source code
  • Private user data in JSON
  • Internal network configuration

Explore All Formatters

Open Formatters JSON Formatter