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Developer tools.

Encode, format, inspect. Keep your workflow moving.

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Choose the right tool for your task

Developer tools help you inspect, format, and transform data while debugging APIs and preparing code. Choose a formatter when readability is the problem, an encoder when a transport format is required, or a parser when you need to inspect structured input.

How do I make a JSON API response readable?

Use the JSON beautifier to add indentation to valid JSON. Formatting improves readability; it does not repair invalid JSON or validate an API response against a schema.

Input: {"status":"ok","count":2}. The same object is displayed with line breaks and indentation.

Open JSON beautifier

How do I read a JWT payload?

Use the JWT decoder to inspect Base64Url-encoded headers and claims. Reading a token does not authenticate its sender. Verify its signature and validate issuer, audience, and expiration in your application.

An exp claim is a Unix timestamp in seconds. Convert it with the epoch converter before comparing it with the expected expiration time.

Open JWT decoder

Is Base64 the same as encryption?

No. Base64 represents bytes as printable text and is reversible without a key. Use it for data transport, not to protect passwords or other secrets.

The UTF-8 text Hello becomes SGVsbG8= in Base64. Decoding returns Hello.

Open Base64 encoder

What to check before using the result

Use non-sensitive sample inputs when debugging. Formatting, encoding, and decoding do not establish that data is safe, authentic, or valid for your application.

$catREADME.md

What Are Developer Tools?

Developer tools (dev tools) are essential utilities that streamline common programming tasks. Our collection includes over 50+ free online tools for formatting, minifying, encoding, decoding, converting, testing, and debugging code and data. All tools run entirely in your browser, ensuring your data remains private and secure. No server uploads, no tracking, no signup requirements—just powerful utilities to boost your productivity.

$ls-la ./tools/categories
{ }#01

Formatters & Beautifiers

Format and beautify JSON, XML, HTML, CSS, JavaScript, and SQL code with proper indentation and syntax highlighting. Perfect for making minified or compressed code readable.

⚡#02

Minifiers & Uglifiers

Compress and optimize code for production by removing whitespace, comments, and unnecessary characters. Reduce file sizes for faster page loads.

🔐#03

Encoders & Decoders

Encode and decode Base64, URLs, and JWT tokens. Essential for working with APIs, authentication systems, email attachments, and data URIs.

⇄#04

Format Converters

Convert between popular data formats including JSON to YAML, YAML to Properties, CSV to JSON, and more. Ideal for configuration management.

✓#05

Testing & Validation

Test regular expressions, parse CRON expressions, validate JSON/XML syntax, and debug strings. Catch errors early and validate patterns.

Aa#06

Text Utilities

Inspect strings, convert text cases, parse URLs, and analyze character encodings. Helpful for data cleaning and content processing.

$grep-r "features"

>Why Use Our Tools?

✓
100% FreeNo costs, no subscriptions, no hidden fees. All tools are completely free forever.
✓
No Signup RequiredStart using tools immediately without creating an account or providing personal information.
✓
Privacy FirstAll processing happens locally in your browser. Your data never touches our servers.
✓
Fast & EfficientInstant results with no server round-trips. Tools are optimized for speed and performance.
✓
Always AvailableAccess tools 24/7 from any device with a modern web browser.
✓
No InstallationWeb-based tools work instantly without downloads, installations, or dependencies.
✓
Regular UpdatesTools are maintained and updated with the latest standards and best practices.
✓
Mobile FriendlyResponsive design works seamlessly on desktop, tablet, and mobile devices.
$catuse-cases.json
⚙️

API Development & Testing

Format JSON responses, encode/decode Base64 payloads, convert between data formats, and validate request/response structures when building or consuming REST APIs.

🚀

Code Optimization

Minify JavaScript, CSS, and HTML files before deploying to production to reduce bandwidth, improve page load times, and optimize website performance for better SEO.

⚙️

Configuration Management

Convert between YAML and Properties files for Spring Boot applications, format JSON configuration files, and manage environment-specific settings across different deployment targets.

🐛

Debugging & Troubleshooting

Beautify minified code to understand third-party libraries, decode JWT tokens to inspect claims, test regex patterns, and analyze string encodings when fixing bugs.

📊

Data Migration & Transformation

Convert CSV to JSON for API consumption, transform JSON to YAML for Kubernetes configs, parse and validate data formats during ETL processes.

🔒

Security & Authentication

Decode JWT tokens to inspect authentication payloads, encode sensitive data with Base64 for transmission, and validate token structures in authentication workflows.

$mandevtools-faq
Are these tools safe for sensitive data?›

Yes, all tools run entirely in your browser using JavaScript. No data is sent to any server or stored anywhere. Your code, configurations, and data remain completely private on your device. However, avoid using these tools on public or shared computers when working with highly sensitive information.

Can I use these tools offline?›

The tools require an initial internet connection to load the page and JavaScript libraries. Once loaded, most tools work offline since all processing happens in your browser. However, some features like external library loading may require an internet connection.

What file size limits do the tools have?›

File size limits depend on your browser's memory and processing capabilities. Most tools can handle files up to several megabytes without issues. For very large files (10MB+), performance may vary depending on your device specifications and browser.

How accurate are the converters and formatters?›

Our tools use industry-standard, well-tested libraries for parsing and conversion. They follow official specifications for formats like JSON, YAML, XML, and Base64. However, always validate the output in your specific use case, especially for production systems.