HomeDeveloper Tools

Developer Utility Tools

High-speed, 100% private developer utilities. Format JSON, encode/decode Base64 and URLs, generate hashes, and escape HTML entities directly in your browser.

{ }

JSON Formatter & Validator

Format, beautify, validate, and minify JSON data with instant error detection and line numbers.

Open JSON Formatter
🔤

Base64 Encoder / Decoder

Convert plain text or binary files into Base64 encoded strings and decode Base64 data instantly.

Open Base64 Tool
🔗

URL Encoder / Decoder

Safely encode special query characters for URLs and decode encoded URL components.

Open URL Encoder
<>

HTML Entity Encoder / Decoder

Escape HTML characters to entity codes (&lt;, &gt;, &amp;) and parse entities back to raw HTML.

Open HTML Entity Tool
🔒

Hash Generator (SHA-256 / MD5)

Generate cryptographic message digests (SHA-1, SHA-256, SHA-512) for text strings using Web Crypto APIs.

Open Hash Generator

Client-Side Developer Utilities — Built for Speed & Privacy

Modern software development requires instant, reliable string formatting, data serialization, and security hashing. DIY Toolkit's Developer Utilities execute 100% locally inside your browser runtime. API keys, JSON payloads, connection strings, and sensitive code fragments never leave your device.

⚡

Zero Latency Execution

No network round-trips or API gateways. String manipulation and JSON parsing happen in under 1 millisecond using native JavaScript engines.

🔒

Air-Gapped Data Privacy

Your passwords, Base64 tokens, and proprietary payloads are computed in isolated browser memory. Zero server logging or tracking.

🛠️

Standardized Algorithms

Strict compliance with RFC 4648 (Base64), RFC 3986 (URI encoding), HTML5 entity specs, and W3C Web Crypto cryptographic digests.

Frequently Asked Questions

Are my JSON payloads or API tokens sent to a remote server?

No. All formatting, minification, encoding, and hashing are processed strictly within your local Web Browser engine using Web APIs. Data is never uploaded to any remote server or third-party cloud.

Which hashing algorithms are supported in the Hash Generator?

We support SHA-256, SHA-512, and SHA-1 using the browser's native crypto.subtle.digest() API for hardware-accelerated cryptographic security.

Can I format minified API responses offline?

Yes. Once the web app is loaded, all developer tools work seamlessly without an internet connection.