Most online developer utilities are bloated, tracking-heavy, or require sending your data to a backend server. Pasting production JSON payloads, API keys, or database dumps into standard web tools is a massive security risk.

Sandbanks DevTools fixes this by operating on a strict local-first, zero-egress architecture. Because the entire application runs inside your browser's native WebAssembly sandbox, your data never leaves your machine.

Features#

🔏 Encoders & Decoders#

Base64 Codec: Instantly encode or decode plain text or URL-safe Base64 strings without JavaScript engine allocation bottlenecks.
URL Codec: Safely encode and decode URL parameters locally to prevent character conflicts.
JWT Decoder: Decode and inspect JSON Web Token (JWT) headers, payloads, and signatures. Paste production access tokens with complete confidence that your keys are never transmitted to a third party.

📄 Formatters & Beautifiers#

JSON Formatter: Format, prettify, and minify complex JSON structures with customizable indentation styles. Powered by client-side serde_json for lag-free rendering.
SQL Formatter: Instantly pretty-print messy, raw SQL queries into clean, highly readable, structured layouts.

🔄 Converters#

JSON to Go Struct: Convert raw JSON objects into fully typed, nested Go struct definitions instantly.
JSON to Rust Struct: Convert JSON payloads into idiomatic, nested Rust struct definitions complete with #[derive(Serialize, Deserialize)] attributes.
YAML ↔ JSON: Seamlessly convert configuration files between YAML syntax and JSON format completely client-side.
CSV ↔ JSON: Transform tabular data between raw CSV sheets and structured JSON arrays.
Timestamp Converter: Convert Unix epoch timestamps to UTC, Local, and ISO dates (and vice versa) without worrying about system timezone leaks.

🎲 Generators#

UUID Generator: Generate cryptographically secure Universally Unique Identifiers (UUIDv4 and UUIDv7) in bulk using native client-side entropy.
Mermaid Diagrams: Render flowcharts, sequence diagrams, and class diagrams instantly using simple Markdown-like text syntax directly in the browser runtime.
QR Code Generator: Generate customized QR codes with custom colors, gradients, logos, and eye patterns entirely offline without reliance on sketchy tracking APIs.

Technical Architecture#

Unlike traditional developer toolkits wrapped in heavy JavaScript frameworks like React, this suite is engineered for raw speed and minimal resource usage:

Leptos Framework: Uses fine-grained reactive signals to manipulate the DOM directly. No Virtual DOM diffing overhead, no heavy node_modules runtime baggage.
Pure Client-Side Rendering (CSR): Compiles down to flat static assets (index.html, a lightweight JS glue file, and a raw .wasm binary). Zero server runtimes, zero hydration mismatches, and 100% offline capable once loaded.
Zero Garbage Collection Pauses: Bypasses managed runtime delays entirely by using Rust's compile-time memory management.

Local Development & Deployment#

Prerequisites#

Ensure you have Rust and the WebAssembly target installed:

rustup target add wasm32-unknown-unknown
cargo install trunk

Run Locally#

To run the development server with hot-reloading:

trunk serve

Build for Production#

To generate the optimized static assets for hosting:

trunk build --release

The resulting output in the /dist folder can be served by any static file host (GitHub Pages, Cloudflare Pages, S3, etc.).

License#

MIT / Apache 2.0

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