Free Developer Tools Online
Format JSON, encode URLs, decode JWTs, test regex, generate hashes, UUIDs and passwords, minify CSS, HTML and JavaScript, and solve everyday coding tasks with free browser-based developer tools.
Start With a Developer Workflow
Choose a common coding workflow and move naturally between tools that solve related tasks.
Debug API Data
Format, validate and convert data from API responses.
Inspect Web Tokens
Decode tokens, generate IDs and check technical strings.
Optimize Frontend Code
Compress web files before publishing or testing pages.
Security & Utility Tasks
Generate passwords, hashes and scannable codes quickly.
All Developer Tools
Choose one of our free developer tools below. Format, validate, encode, decode, minify and generate useful data online.
QR Code Generator
Create QR codes for links, text, contact info and more.
Password Generator
Generate strong random passwords with letters, numbers and symbols.
JSON Formatter & Validator
Format, beautify, validate and minify JSON data online.
HTML Entity Encoder/Decoder
Encode and decode HTML entities for safe web output.
URL Encoder/Decoder
Encode and decode URLs, query strings and special characters.
MD5 Hash Generator
Generate MD5 hashes from text instantly.
SHA256 Hash Generator
Create SHA-256 hashes for text and data verification.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and back.
XML to JSON Converter
Convert XML data into clean JSON format online.
JSON to XML Converter
Convert JSON data into XML format quickly.
CSS Minifier
Minify CSS code by removing unnecessary spaces and comments.
HTML Minifier
Compress HTML code for cleaner and smaller output.
JavaScript Minifier
Minify JavaScript code for faster web delivery.
User Agent Finder
Find your browser user agent string and device details.
My IP Address Lookup
Check your public IP address and basic browser information.
JWT Decoder
Decode JSON Web Tokens and inspect header and payload data.
UUID Generator
Generate random UUID v4 identifiers and unique IDs.
Regex Tester
Test regular expressions against sample text instantly.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 data online.
Browse Developer Tools by Task
Find the right coding utility faster by choosing the type of developer task you want to complete.
Format & Convert Data
Work with JSON, XML, Base64 and encoded content.
JSON FormatterXML to JSONJSON to XMLBase64 Encoder / DecoderURL Encoder / DecoderDebug & Inspect
Inspect browser, token, regex, time and network information.
JWT DecoderRegex TesterUnix Timestamp ConverterUser Agent FinderMy IP Address LookupGenerate & Optimize
Create IDs, hashes, passwords, QR codes and smaller code files.
UUID GeneratorPassword GeneratorSHA256 Hash GeneratorQR Code GeneratorJavaScript MinifierFree developer tools for coding, debugging and web projects.
The MuffinPost Developer Tools collection helps programmers, web developers, students and technical users format data, generate identifiers, encode content, test regular expressions, inspect tokens and minify code directly online.
Use these tools for APIs, web apps, debugging, frontend development, backend tasks, data conversion, security utilities, QR codes, hashes and everyday coding workflows.
Why Use Online Developer Tools?
Developer tools make repetitive coding tasks faster, cleaner and easier to test.
Related Tool Categories
Continue exploring tools that work naturally with coding, data, content and web projects.
Helpful Developer Guides
Learn practical ways to prepare web content, optimize assets and improve technical workflows.
Developer Tools FAQ
Common questions about using free online developer tools.
Are these developer tools free?
Yes. Every developer tool on The MuffinPost is free to use online.
Do I need to install anything?
No. These tools work directly in your browser without software installation.
Can I format JSON online?
Yes. You can use the JSON Formatter and Validator to format, beautify, validate and minify JSON data.
Can I generate hashes online?
Yes. You can generate MD5 and SHA256 hashes using the available hash generator tools.
Can I minify code online?
Yes. You can minify CSS, HTML and JavaScript using the developer minifier tools.
Can I decode JWT tokens?
Yes. The JWT Decoder can decode JSON Web Token header and payload data for inspection.
Can I test regular expressions?
Yes. The Regex Tester lets you test regular expressions against sample text directly in your browser.
Are these tools mobile friendly?
Yes. The developer tools pages are responsive and work on desktop, tablet and mobile browsers.