Spoold is a free, privacy-first developer toolbox that automatically detects what you paste (JSON, HTML, JWT, curl, etc.) and suggests the right tool. No sign-up required.

Is Spoold free to use?

Yes, Spoold is completely free to use. All tools work client-side in your browser with no data sent to servers.

Is my data safe with Spoold?

Absolutely. All processing happens in your browser. We don't store or transmit your data. Shared links use client-side encryption.

What tools are available?

Spoold includes JSON formatter, JSON diff, HTML preview, JWT decoder, time converter, CSV viewer, URL inspector, QR code generator/scanner, regex tester, Markdown preview, and curl converter.

Can I use keyboard shortcuts?

Yes! Press Cmd/Ctrl+K to search, or use shortcuts like 'jj' for JSON, 'hh' for HTML, 'tt' for Time converter, and more.

Online Code Editor: Write Code in 40+ Programming Languages | Spoold Blog

Our Online Code Editor supports 40+ programming languages with full syntax highlighting, auto-formatting, and code execution. Whether you're writing Python scripts, JavaScript functions, or Go programs, edit and test your code instantly in your browser.

Why Use an Online Code Editor?

No Installation Required: Start coding immediately in your browser
40+ Languages: Support for Python, JavaScript, TypeScript, Java, C/C++, Go, Rust, PHP, Ruby, and more
Syntax Highlighting: Powered by Monaco Editor (same as VS Code)
Auto-Formatting: Format code with one click for supported languages
Code Execution: Run JavaScript, TypeScript, and Python code directly in the browser
Privacy-First: All code stays in your browser - never sent to servers

Supported Programming Languages

Our code editor supports a wide range of languages:

Web Development

JavaScript: Modern ES6+ syntax, async/await, modules
TypeScript: Type-safe JavaScript with full IntelliSense
HTML/CSS: Web markup and styling
SCSS/LESS: CSS preprocessors

Backend Languages

Python: Scripts, data processing, web development
Java: Enterprise applications, Android development
Go: Concurrent programming, microservices
Rust: Systems programming, performance-critical code
PHP: Server-side web development
Ruby: Web applications, scripting

Mobile Development

Swift: iOS and macOS development
Kotlin: Android development, JVM applications
Dart: Flutter mobile apps

Data & Query Languages

SQL: Database queries and operations
GraphQL: API query language

Configuration & Markup

JSON/YAML: Configuration files, data serialization
XML: Markup and data exchange
TOML/INI: Configuration formats
Markdown: Documentation and notes

System & Scripting

Bash/Shell: Unix shell scripting
PowerShell: Windows automation
Dockerfile: Container definitions

Key Features

1. Syntax Highlighting

Accurate syntax highlighting for all supported languages
Bracket matching and code folding
Multi-cursor editing
Find and replace with regex support

2. Auto-Formatting

Format your code with one click for these languages:

JavaScript, TypeScript
JSON, HTML, CSS, SCSS, LESS
Markdown, SQL

3. Code Execution

Execute code directly in the browser for:

JavaScript/TypeScript: Run in browser runtime
Python: Execute with Pyodide (Python in the browser)
More languages coming soon via remote execution APIs

4. Save & Share

Auto-save your code to browser storage
Save named versions for quick access
Share code with shareable links
View edit history

Best Practices

Use proper indentation for readability
Format code before sharing
Test code execution before using in production
Save important code snippets for later
Use syntax highlighting to catch errors early

Use Cases

Quick code prototyping and testing
Learning new programming languages
Code snippets and examples
API testing and debugging
Configuration file editing
Code sharing and collaboration

Start coding in any language with our Online Code Editor - it's free, private, and supports 40+ languages!