A collection of 100+ essential developer tools built with privacy in mind. No backend. Tool data never leaves your browser. Anonymized analytics help improve the site.
- SAML Decoder: Decode SAML Requests/Responses from Base64 to readable XML
- SAML Metadata Parser: Parse SAML Metadata XML and extract IdP/SP configuration
- SAML Certificate Inspector: Inspect X.509 certificates from SAML metadata, responses, or PEM
- SAML Assertion Builder: Generate test SAML Responses, AuthnRequests, and LogoutRequests
- SAML Metadata Generator: Generate SAML 2.0 EntityDescriptor metadata XML for SPs and IdPs
- SAML Response Validator: Debug a SAML Response and find out why SSO login is failing
- JS Tokenizers: Tokenize text using various AI tokenizers
- RAG Chunker: Split text into retrieval-friendly chunks with overlap and token counts
- Sentiment Analysis: Analyze emotional tone of text using AI
- Zero-Shot Classification: Classify text into custom categories without training using AI
- Sentence Similarity: Generate embeddings and find semantic similarity between texts using AI
- Question Answering: Answer questions based on provided context using AI
- Fill-Mask Text Completion: Complete sentences and predict missing words using AI
- Text Summarization: Summarize long text into concise overviews using AI
- Text Extractor: Extract emails, URLs, IPs, dates, and patterns from text
- Vibe Check: Generate AI code review, test plan, and production readiness prompts for vibe-coded apps
- String Similarity: Compare strings using Jaro-Winkler, Levenshtein, Dice, and Hamming algorithms
- Regex Tester: Test regular expressions with match highlighting, capture groups, and string replacement
- Regex Library: Browse and copy common regular expressions for validation, extraction, and text processing
- Number Base Converter: Convert numbers between binary, octal, decimal, and hex with two's complement
- SemVer Comparator: Compare, sort, and validate semantic version strings per SemVer 2.0.0 with prerelease and build metadata support
- JSON Prettifier: Format and validate JSON data
- XML/HTML Formatter: Format, validate, prettify, and minify XML or HTML data
- XML ↔ JSON Converter: Bidirectional XML-to-JSON and JSON-to-XML converter using the familiar @attr / _text convention; repeated tags collapse into arrays
- JSONPath Query Engine: Test JSONPath expressions — supports dot/bracket access, wildcards, slices, recursive descent (..), and filter [?(...)] expressions
- GraphQL Formatter: Format and validate GraphQL queries, mutations, subscriptions, and fragments — preserves string literals, args, blocks, lists, and comments
- TOML Parser: Parse, validate, format, and round-trip TOML to/from JSON — spec-compliant via smol-toml
- CSS Minifier / Beautifier: Minify CSS by stripping comments and whitespace, or beautify minified CSS with re-indentation — preserves spaces inside parentheses for values like rgba() and calc()
- JavaScript Minifier: Strip comments and whitespace from JavaScript while preserving strings, template literals, and regex syntax — no AST, no variable renaming, just fast cosmetic minification
- Data URI Converter: Convert text to a data: URI with UTF-8 Base64 encoding, or decode a data: URI back to text or binary bytes — handles any MIME type
- Markdown Live Preview: Write Markdown on the left, see the rendered HTML preview on the right — supports headings, bold, italic, code, lists, quotes, links, autolinks, and GFM strikethrough
- SVG Editor: Edit SVG code on the left, see the live preview on the right — strips scripts and event handlers for safety, adjusts missing xmlns
- SVG Path Visualizer: Paste an SVG path d attribute and see it rendered instantly — includes presets (curve, star, arc, bezier), adjustable stroke/fill colors, and an optional grid overlay
- HL7 Parser: Read and parse HL7 v2 messages into structured JSON
- HL7 to FHIR Converter: Convert HL7 v2 messages to FHIR R4 Bundles
- Diff / Text Compare: Compare two texts and see color-coded differences
- Stack Trace Formatter: Format and beautify JavaScript, Python, Java, C#, Go, PHP, and Ruby stack traces
- Beautify Stack Trace: Clean up and beautify messy error stack traces for readability
- Stack Trace Analyzer: Analyze stack traces to identify root causes, explain errors, and separate app from framework code
- Base64 Encoder/Decoder: Encode and decode Base64 strings
- File Size Converter: Convert file sizes between decimal (SI) and binary (IEC) units
- Unix Timestamp Converter: Convert Unix epoch timestamps to human-readable dates — single or batch — with timezone support
- Cron Expression Tester: Test and parse cron expressions, explain them in plain English, and preview upcoming run times across timezones
- Cron Expression Generator: Build cron expressions visually with field controls — no syntax knowledge required
- URL Encoder / Decoder: Encode and decode URLs using encodeURIComponent and encodeURI
- YAML/JSON Converter & Formatter: Convert between YAML and JSON, or format and validate standalone YAML
- CSV ↔ JSON Converter: Convert between CSV and JSON with auto-detection, delimiter handling, type inference, and nested-object flattening
- CSV Viewer / Table Explorer: Paste CSV and explore it as a sortable, searchable table with sticky headers — no spreadsheet required
- SQL Formatter: Format and prettify SQL queries with support for MySQL, PostgreSQL, SQLite, and more
- String Case Converter: Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, title, and sentence case
- Text Statistics: Live word, character, sentence, line, and paragraph counts with reading time and average length stats
- Line Sorter & Deduplicator: Sort lines alphabetically, numerically, by length, with optional deduplication and trimming
- String Escape / Unescape: Escape and unescape text for JSON, XML, CSV, regex, or POSIX shell contexts
- Whitespace Visualizer & Cleaner: Spot invisible whitespace characters (tabs, NBSP, zero-width, trailing) and clean them with batch options
- HTML Entity Encoder / Decoder: Encode text to HTML entities (named, decimal, hex) and decode entities back to characters
- Unicode Escape / Unescape: Convert text to \uXXXX and \u{XXXXX} Unicode escapes and back — handles emoji and surrogate pairs
- Morse Code Translator: Convert text to ITU-R M.1677-1 Morse code and back — supports letters, digits, common punctuation, and word breaks
- Password Generator: Generate secure random passwords
- UUID Generator: Generate UUIDs across all RFC 9562 versions — nil, v1, v2, v3, v4, v5, v6, v7, and v8
- Lorem Ipsum Generator: Generate placeholder text for designs
- Random Number Generator: Generate random numbers and see code samples in multiple languages
- QR Code Generator: Generate QR codes from text, URLs, or any data
- ULID Generator: Generate ULIDs — 26-character lexicographically sortable identifiers (48-bit timestamp + 80-bit random) with optional monotonic mode
- Git Branch Name Generator: Convert a feature description into a clean, git-safe branch name with optional prefix (feat, fix, chore, etc.) and ticket id. Includes copy-paste checkout and push commands
- ASCII Art Text Generator: Convert text to ASCII art banner with built-in block, banner, and thin fonts — no external font files, works in any browser
- JSON to TypeScript: Convert JSON to TypeScript interfaces
- JSON to JSDoc: Convert JSON to JSDoc type definitions
- JSON to C#: Convert JSON to C# classes
- JSON to Swift: Convert JSON to Swift structs
- JSON to Kotlin: Convert JSON to Kotlin data classes
- JSON to Python: Convert JSON to Python dataclasses or Pydantic models
- JSON to Go: Convert JSON to Go structs
- JSON to Rust: Convert JSON to Rust structs
- JSON Schema Validator & Generator: Infer a JSON Schema (draft 2020-12 or draft-07) from JSON and validate JSON against a schema — supports multiple samples to detect optional fields
- Color Picker: Pick colors, convert between HEX/RGB/HSL/HSV/CMYK, and browse curated palettes (Tailwind, Nord, Solarized, Dracula, and more)
- API Tester: Test and view API responses
- HTTP Status Code Reference: Searchable reference of all HTTP status codes with descriptions and use cases
- MIME Type Lookup: Search common MIME types by file extension, MIME string, or category — covers images, video, audio, archives, documents, code, fonts, and data formats
- Common Port Number Reference: Searchable reference of common TCP/UDP ports for web, database, email, file transfer, remote access, messaging, networking, DevOps, and security services
- CIDR / Subnet Calculator: IPv4 and IPv6 CIDR calculator — network address, broadcast, subnet mask, host range, RFC 1918 / ULA private range detection, reverse DNS PTR, and subnet splitting
- Secrets Scanner: Scan text, logs, or configs for leaked keys and tokens
- JWT Decoder: Decode and inspect JWT tokens
- MD5 Hash: Generate MD5 hashes from text
- SHA-1 Hash: Generate SHA-1 hashes from text
- SHA-256/384/512 Hash: Generate secure SHA-256, SHA-384, or SHA-512 hashes from text
- HMAC Generator: Generate HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512 — output as hex, base64, or base64url
- Clawdbot Security Scanner: Audit Clawdbot/Moltbot/OpenClaw configs for security vulnerabilities
- Certificate & CSR Decoder: Decode X.509 certificates and PKCS#10 CSRs — subject, issuer, expiry, SANs, extensions, and key details
- OSS Data: Open-source data tools for developers
- iOS App Lookup: Look up iOS app metadata from the App Store using bundle ID
- Agent Helper: AI assistant for building and debugging software agents
- GameWobble: Free bite-sized browser games you can play instantly with no downloads or signup
- Terremoto: iOS app for tracking earthquakes in real-time
- FedPulse: iOS app to search, save, and track federal government jobs
- FAA Part 107 Quiz Prep: iOS app for FAA Part 107 drone pilot certification exam preparation
- Citizenship Test Prep: iOS app for US citizenship naturalization test preparation
- ClawPet: iOS virtual desktop pet that visualizes bot activity in real-time
- Tech - Interview Prep: iOS app for technical interview prep with 1,400+ questions across AI, system design, and more
- DownRangeHQ Shot Timer: iOS and Apple Watch shot timer and drill tracker for competition shooters
- Melody Island: Kids Piano: iOS piano app for kids with colorful keys, adventure levels, and guided songs
- ColorPop Calculator: iOS calculator for kids ages 4-8 with visual object-based math
- Phlebotomy Technician ExamPrep: iOS app for NHA Certified Phlebotomy Technician exam preparation
- CCMA Exam Prep: iOS app for Certified Clinical Medical Assistant exam preparation
Explore the live version of this DevTools suite at https://www.developers.do.
This site supports the llms.txt standard for AI discoverability:
/llms.txt- Concise overview of all tools/llms-full.txt- Detailed documentation for AI consumption
Ensure you have the following installed on your system:
- Git: For cloning the repository.
- Bun: The JavaScript runtime and package manager.
Follow these steps to get the application up and running on your local machine.
git clone https://github.com/hminaya/devtools.git
cd devtoolsbun installbun run devThe application will typically be accessible at http://localhost:3000 in your web browser.
By default, the application runs on port 3000, which is hardcoded in the dev script. To use a different port, run the dev server directly:
bunx next dev -p 8080Alternatively, edit the dev script in package.json to change the port permanently.
In the project directory, you can run:
bun run dev: Runs the app in development mode.bun run build: Builds the application for production.bun run start: Starts the production server (after building).bun run lint: Type-checks the codebase with TypeScript.bun run generate:og: Generates Open Graph images for tools.bun run generate:llms: Regenerates the/llms.txtand/llms-full.txtfiles.
You can build and run the app locally using Docker — no Bun or Node.js installation required.
docker build -t developers-do .docker run -p 8080:80 developers-doThe app will be available at http://localhost:8080.
The Docker build uses a two-stage process:
- Builder — installs dependencies with Bun and runs
bun run build, producing static HTML/CSS/JS in theout/directory. - Runner — copies the static files into an nginx image for serving. No Node.js or Bun is needed at runtime.
This project is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.