# DevTools by developers.do - Complete Documentation

> A privacy-focused collection of free developer tools that run 100% client-side in your browser. No backend, no data collection, no tracking. All processing happens locally on the user's device.

## About DevTools

DevTools is a suite of essential utilities for software developers built with privacy as the core principle. Key characteristics:

- **100% Client-Side**: All tools run entirely in the browser using JavaScript, WebAssembly, and Web APIs
- **No Data Collection**: User input is never transmitted to any server
- **No Tracking**: No analytics, cookies for tracking, or fingerprinting
- **Works Offline**: After initial page load, most tools work without internet
- **Open Source**: Built with Next.js, React, TypeScript, and Tailwind CSS

Website: https://developers.do

---

## Security Tools

### SHA-256/512 Hash Generator
**URL**: https://developers.do/tools/sha256-generator

Generate cryptographically secure hashes using SHA-256 (64 characters) or SHA-512 (128 characters). Uses the Web Crypto API for reliable, fast hashing. Ideal for:
- File integrity verification
- Password hashing (with proper salting)
- Digital signatures
- Data deduplication

### SHA-1 Hash Generator
**URL**: https://developers.do/tools/sha1-generator

Generate SHA-1 hashes (40 characters). Note: SHA-1 is no longer considered cryptographically secure. Use only for:
- Checksums
- Cache busting
- Non-security-critical deduplication
- Legacy system compatibility

### MD5 Hash Generator
**URL**: https://developers.do/tools/md5-generator

Generate MD5 hashes (32 characters). Note: MD5 is cryptographically broken. Use only for:
- Checksums
- Cache keys
- Non-security purposes

### JWT Decoder
**URL**: https://developers.do/tools/jwt-decoder

Decode and inspect JSON Web Tokens without sending them to a server. Displays:
- Header (algorithm, type)
- Payload (claims, expiration, issuer)
- Signature (for inspection, not verification)

Useful for debugging authentication flows and understanding token contents.

### Secrets Scanner
**URL**: https://developers.do/tools/secrets-scanner

Scan text, logs, configuration files, or code for accidentally leaked secrets including:
- AWS access keys and secret keys
- GitHub tokens
- Stripe API keys
- Google API keys
- Private keys (RSA, SSH)
- Database connection strings
- Generic API keys and tokens

### Password Generator
**URL**: https://developers.do/tools/password-generator

Generate cryptographically secure random passwords using `crypto.getRandomValues()`. Options include:
- Password length
- Uppercase/lowercase letters
- Numbers
- Special characters
- Multiple passwords at once

---

## Formatting Tools

### JSON Prettifier
**URL**: https://developers.do/tools/json-prettifier

Format, validate, and beautify JSON data. Features:
- Syntax highlighting
- Error detection with line numbers
- Minify option
- Copy formatted output

### XML Prettifier
**URL**: https://developers.do/tools/xml-prettifier

Format and validate XML data with proper indentation and syntax highlighting.

### Base64 Encoder/Decoder
**URL**: https://developers.do/tools/base64-encoder

Encode text to Base64 or decode Base64 strings. Useful for:
- Data URLs
- Basic authentication headers
- Email attachments (MIME)
- Embedding binary data in JSON/XML

### Stacktrace Formatter
**URL**: https://developers.do/tools/stacktrace-formatter

Format and beautify stack traces from multiple programming languages for easier debugging.

### File Size Converter
**URL**: https://developers.do/tools/file-size-converter

Convert file sizes between decimal (SI: KB, MB, GB) and binary (IEC: KiB, MiB, GiB) units.

---

## Code Generators & Converters

### JSON to TypeScript
**URL**: https://developers.do/tools/json-to-typescript

Convert JSON objects to TypeScript interfaces. Automatically infers types and generates properly typed interfaces.

### JSON to C#
**URL**: https://developers.do/tools/json-to-csharp

Convert JSON to C# classes with proper property types and attributes.

### JSON to Swift
**URL**: https://developers.do/tools/json-to-swift

Convert JSON to Swift structs with Codable conformance.

### JSON to Kotlin
**URL**: https://developers.do/tools/json-to-kotlin

Convert JSON to Kotlin data classes.

### JSON to Go
**URL**: https://developers.do/tools/json-to-go

Convert JSON to Go structs with proper json tags.

### JSON to Rust
**URL**: https://developers.do/tools/json-to-rust

Convert JSON to Rust structs with serde derive macros.

### JSON to JSDoc
**URL**: https://developers.do/tools/json-to-jsdoc

Convert JSON to JSDoc type definitions for JavaScript documentation.

---

## Generators

### UUID Generator
**URL**: https://developers.do/tools/uuid-generator

Generate UUID v4 (random) identifiers. Uses `crypto.randomUUID()` or `crypto.getRandomValues()` for cryptographic randomness.

### QR Code Generator
**URL**: https://developers.do/tools/qr-code-generator

Generate QR codes from text, URLs, or any data. Uses Canvas API for rendering.

### Lorem Ipsum Generator
**URL**: https://developers.do/tools/lorem-ipsum-generator

Generate placeholder text for designs. Options for paragraphs, sentences, or words.

### Random Number Generator
**URL**: https://developers.do/tools/random-number-generator

Generate random numbers with configurable range. Includes code samples in multiple programming languages.

---

## AI-Powered Tools

All AI tools run models directly in the browser using Transformers.js (WebAssembly/WebGPU). No data is sent to external AI services.

### JS Tokenizers
**URL**: https://developers.do/tools/js-tokenizer

Tokenize text using various AI model tokenizers. Useful for:
- Estimating token counts for API pricing
- Understanding how models see your text
- Debugging prompt engineering

### RAG Chunker
**URL**: https://developers.do/tools/rag-chunker

Split text into retrieval-friendly chunks with configurable overlap and token counts. Essential for building RAG (Retrieval-Augmented Generation) applications.

### Sentiment Analysis
**URL**: https://developers.do/tools/sentiment-analysis

Analyze the emotional tone of text (positive, negative, neutral) using in-browser AI models.

### Zero-Shot Classification
**URL**: https://developers.do/tools/zero-shot-classification

Classify text into custom categories without training. Define your own labels and classify text instantly.

### Sentence Similarity
**URL**: https://developers.do/tools/sentence-similarity

Generate text embeddings and calculate semantic similarity between sentences or documents.

### Question Answering
**URL**: https://developers.do/tools/question-answering

Extract answers from a given context passage. Provide context and ask questions about it.

### Fill-Mask Text Completion
**URL**: https://developers.do/tools/fill-mask

Predict missing words in sentences using masked language models.

### Text Summarization
**URL**: https://developers.do/tools/text-summarization

Summarize long text into concise overviews using AI.

### Text Extractor
**URL**: https://developers.do/tools/text-extractor

Extract structured data from unstructured text:
- Email addresses
- URLs
- IP addresses
- Dates
- Phone numbers
- Custom patterns (regex)

---

## Utility Tools

### Color Picker
**URL**: https://developers.do/tools/color-picker

Pick colors and convert between formats:
- HEX (#RRGGBB)
- RGB (red, green, blue)
- HSL (hue, saturation, lightness)
- HSV (hue, saturation, value)
- CMYK (cyan, magenta, yellow, black)

### API Tester
**URL**: https://developers.do/tools/api-tester

Test REST API endpoints and view responses. Supports:
- GET, POST, PUT, DELETE, PATCH methods
- Custom headers
- Request body
- Response inspection

Note: This is the only tool that makes external HTTP requests, and only to URLs explicitly provided by the user.

### iOS App Lookup
**URL**: https://developers.do/tools/ios-app-lookup

Look up iOS app metadata from the App Store using bundle ID. Returns app name, description, version, ratings, and more.

---

## iOS Apps

### Terremoto
**URL**: https://terremoto.developers.do

iOS app for tracking earthquakes in real-time. Features:
- Real-time earthquake alerts
- Interactive map with earthquake locations
- Historical earthquake data
- Customizable notification settings

### FedPulse
**URL**: https://fedpulse.developers.do

iOS app to search, save, and track federal government jobs. Features:
- Search USAJobs listings
- Save and track favorite positions
- Job alerts and notifications
- Filter by agency, location, and salary

### FAA Part 107 Quiz Prep
**URL**: https://part107.developers.do

iOS app for FAA Part 107 drone pilot certification exam preparation. Features:
- Practice questions for the FAA Part 107 exam
- Study mode and test simulation
- Track your progress
- Comprehensive coverage of drone regulations

### Citizenship Test Prep
**URL**: https://citizenshiptest.developers.do

iOS app for US citizenship naturalization test preparation. Features:
- All 100 civics test questions
- Practice tests and flashcards
- Audio pronunciation of questions and answers
- Track your study progress

---

## Privacy Commitment

DevTools is built on a strict privacy-first philosophy:

1. **No Analytics**: We don't use Google Analytics, Mixpanel, or any tracking service
2. **No Cookies**: No tracking cookies. Only functional cookies for preferences if needed
3. **No Server Processing**: All tool operations happen in your browser
4. **No Data Retention**: We don't store any user input or output
5. **No Account Required**: Use all tools without signing up
6. **Open Source**: Verify our claims by reviewing the code

---

## Technical Stack

- **Framework**: Next.js 16.1.1 (Static Export)
- **UI**: React 19.2.3, Tailwind CSS 4.1.18
- **Language**: TypeScript 5.9.3
- **AI Runtime**: Transformers.js (WASM/WebGPU)
- **Crypto**: Web Crypto API
- **Package Manager**: Bun

---

## Contact

Website: https://developers.do