Free Online Developer Tools - Rune

Essential developer utilities including JSON formatter, Base64 encoder, UUID generator, regex tester, hash generator, and code formatter. Free tools for programmers.

Developer Tools

Essential online tools for developers and programmers. JSON formatter & validator, Base64 encoder/decoder, UUID generator, hash generator, regex tester, DNS lookup, and more. 100% free, browser-based, no installation required.

Text Compare

Compare two texts side-by-side with real-time diff highlighting

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Line Break Remover

Cleans up text by removing extra line breaks and spaces

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File Share

Upload a file and generate a shareable link

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Color Picker

Identify and extract hex codes of colors from an uploaded image

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Safe Link Checker

Check if a URL is safe and free from malware

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Code Formatter

Beautify or minify HTML, CSS, and JavaScript code

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Popular

JSON Formatter

Validate, format, and view JSON data in a clean tree structure

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JSON Generator

Create, format, and validate JSON data with sample data generation

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Base64 Encoder/Decoder

Quickly encode data to Base64 or decode it back

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UUID Generator

Generate universally unique identifiers (UUIDs)

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Hash Generator

Create MD5, SHA-1, and SHA-256 hashes from any text

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Regex Tester

Build and test regular expressions in real-time

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My IP Address

Instantly check your public IP address

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DNS Lookup

Perform a DNS lookup to check records for any domain

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Public API Finder

A curated list of free public APIs for projects

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Password Generator

Create strong, random, and secure passwords

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Text Encryptor

Encrypt and decrypt text messages with a password

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Fake Data Generator

Generate fake names, addresses, and emails for testing

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IP Address Info

Get location and other details about an IP address

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JSON to CSV Converter

Convert JSON data into a CSV or Excel format

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URL & Email Extractor

Pull all URLs or email addresses from a block of text

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About Developer Tools

Our comprehensive collection of free online developer tools is built for programmers, web developers, and software engineers. From JSON formatting and validation to Base64 encoding, hash generation, and regex testing, we provide essential utilities that streamline your development workflow.

Instant
Processing
100%
Secure
10+
Tools
24/7
Available

Key Features of Developer Tools

Everything you need for professional developer tools

Data Formatting

Format and validate JSON, convert between data formats, beautify or minify code

Encoding & Hashing

Base64 encoding/decoding, MD5/SHA hash generation for security and data integrity

Privacy First

All processing happens in your browser - your data never leaves your device

Instant Results

Real-time processing with no delays - see results as you type

Multiple Formats

Support for JSON, CSV, Base64, UUID, regex, and various encoding formats

Always Free

All developer tools are completely free with no limitations or hidden fees

How to Use Developer Tools

Follow these simple steps to get started

01

Select Your Tool

Choose from JSON formatter, Base64 encoder, UUID generator, hash generator, regex tester, DNS lookup, or other developer utilities

02

Input Your Data

Paste your JSON, text, code, or enter the data you want to process. Most tools provide real-time validation

03

Get Instant Results

View formatted output, copy results, download files, or use the generated data directly in your projects

Pro Tips

  • Use JSON formatter to validate API responses and debug issues
  • Generate UUIDs for database primary keys and unique identifiers
  • Test regex patterns with multiple test cases before implementation
  • Use hash generator to verify file integrity and create checksums
  • Check DNS records to troubleshoot domain configuration issues

Frequently Asked Questions

Everything you need to know about Developer Tools

Yes! All our developer tools including JSON formatter, Base64 encoder/decoder, UUID generator, hash generator, regex tester, DNS lookup, IP checker, JSON generator, and JSON to CSV converter are 100% free with no hidden charges.

Our JSON formatter validates, beautifies, and minifies JSON data in real-time. It checks for syntax errors, displays data in a tree structure, and highlights invalid JSON.

Base64 is an encoding scheme that converts binary data into ASCII text format. Use it to embed images in HTML/CSS, encode data in URLs, or transmit binary data over text-based protocols.

Our hash generator creates MD5, SHA-1, SHA-256, and SHA-512 hashes entirely in your browser - no data is sent to servers.

UUID (Universally Unique Identifier) is a 128-bit number guaranteed to be unique. Developers use UUIDs for database primary keys, API request IDs, session tokens, and distributed system identifiers.

Our regex tester lets you write, test, and debug regex patterns in real-time with multiple test strings. See matches, groups, and explanations instantly.

Most developer tools work offline after initial page load: JSON formatter, Base64 encoder/decoder, UUID generator, hash generator, and regex tester all run entirely in your browser.

Absolutely! All developer tools are free for personal and commercial use without restrictions.

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Complete Guide to Free Online Developer Tools

Best Free JSON Formatter and Validator Online

Our JSON formatter is a powerful free online tool for developers to validate JSON syntax, beautify with proper indentation, and minify for production deployment. Features include tree view visualization, error highlighting with line numbers, and copy-to-clipboard functionality. Essential for API development, debugging, and configuration management.

Base64 Encoder and Decoder

Convert text, strings, and files to Base64 encoding or decode Base64 back to the original format. Commonly used for embedding images in CSS, encoding API tokens, and handling binary data in text-based protocols. Supports URL-safe encoding and handles Unicode characters correctly.

UUID and GUID Generator

Generate universally unique identifiers (UUIDs) or GUIDs instantly for databases, APIs, and distributed systems. Create v4 random UUIDs with cryptographic randomness, perfect for primary keys, session tokens, and unique resource identifiers in microservices architectures.

Regex Tester with Real-Time Matching

Test and debug regular expressions in real-time with our regex tester. See matches highlighted instantly, view capture groups, and get explanations of your patterns. Supports JavaScript, Python, and PCRE regex flavors. Invaluable for form validation, data extraction, and text processing tasks.

Code Formatter and Hash Generator

Format HTML, CSS, and JavaScript code with proper indentation and syntax standards. Generate MD5, SHA-1, SHA-256, and other cryptographic hashes for file integrity verification, password hashing, and security applications. All processing happens in your browser for complete privacy.