DevStash
Your developer toolkit, in orbit.
Fast, free, and privacy-friendly utilities for everyday development tasks. No sign-up, no tracking — just tools that work.
JSON Formatter
Format, validate, and minify JSON with syntax highlighting and tree view
Regex Tester
Test regular expressions with live matching, flags, and capture groups
Base64 Encoder/Decoder
Encode and decode Base64 with text and file support
Cron Expression Builder
Build cron expressions with dropdowns and see the next scheduled runs
UUID Generator
Generate UUID v4 and v7 with bulk generation and format options
URL Encoder/Decoder
Encode and decode URLs with component and full encoding modes
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes for text and files
JWT Decoder
Decode JWT tokens with header/payload display and expiration check
Color Converter
Convert between HEX, RGB, HSL, and HSV with a color picker and contrast checker
Timestamp Converter
Convert between Unix timestamps and human-readable dates with timezone support
Markdown Preview
Write Markdown and see a live rendered preview side by side
SQL Formatter
Format, beautify, and minify SQL queries with syntax highlighting
Diff Checker
Compare two texts side by side and see additions, removals, and changes
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words
CSS/JS Minifier
Minify and beautify CSS and JavaScript code with size comparison
YAML ↔ JSON Converter
Convert between YAML and JSON formats bidirectionally
Chmod Calculator
Calculate Unix file permissions with an interactive checkbox grid
HTTP Status Codes
Searchable reference of all HTTP status codes with descriptions
Token Counter
Estimate token counts for GPT-4, Claude, Gemini, and Llama models
AI Model Pricing
Compare API costs across GPT-4, Claude, Gemini, and more AI models
Text Splitter
Split text into chunks for RAG pipelines with configurable size and overlap
.gitignore Generator
Generate .gitignore files for any language or framework by selecting from 40+ templates
Docker Run → Compose
Convert docker run commands to docker-compose.yml instantly — supports ports, volumes, env vars, and more
robots.txt Validator
Parse and validate robots.txt files — check syntax, view rules per user-agent, and test URLs
HTTP Headers Analyzer
Paste HTTP response headers to get security scores, caching analysis, and plain-English explanations
CORS Debugger
Paste HTTP request and response headers to diagnose CORS issues with plain-English explanations
Unicode Lookup
Look up any Unicode character by codepoint, name, or pasting the character — see UTF-8/16 bytes, HTML entities, and more
Semver Explainer
Paste a semver range like ^1.2.3 or ~4.0 and get a plain-English explanation with version match tests
Bcrypt Generator
Hash strings with bcrypt and verify hashes — configurable cost rounds, runs in your browser
OpenAPI Validator
Validate OpenAPI 3.x and Swagger 2.x specs — paste JSON or YAML to check structure and browse endpoints
Why Choose DevStash?
🔒 Privacy First
All processing happens in your browser. We never see, store, or send your data to any server. Your privacy is guaranteed.
⚡ Blazing Fast
No server requests. Static HTML files served from CDN. Tools load instantly and respond with zero latency.
✨ Zero Sign-Up
No accounts, passwords, or registration. Start using any tool immediately without friction.
📚 Rich References
17+ cheatsheets and guides for Git, Docker, Bash, SQL, regex, and more — all completely free and offline-ready.
How DevStash Works
DevStash is built on a philosophy of simplicity and speed: every tool runs entirely in your browser using vanilla JavaScript and modern web APIs. We use Astro 4 to generate static HTML pages that ship zero JavaScript overhead by default. Each interactive tool is a Svelte 5 island that compiles down to ~5-10 KB of vanilla JS per tool — no frameworks loaded that you don't need.
When you paste JSON into the formatter, hash a file, or test a regex pattern, that processing happens on your device using the browser's Web Crypto API, Canvas API, and native JavaScript. Nothing is sent to any server. This means your sensitive data stays private, requests have zero latency, and tools work offline.
The result: a global network of fast, reliable, privacy-first utilities that developers reach for daily. No sign-up friction, no tracking, no lock-in. Just tools that work.
Developer Reference Library
Beyond tools, DevStash offers a growing library of quick-reference guides and cheatsheets for the technologies developers use daily. Each guide is designed to be scanned quickly and bookmarked for future use — no ads, no sign-up, just the facts.
Git Commands
Essential Git commands for branches, merging, rebasing, and undoing changes.
Regex Patterns
Anchors, quantifiers, lookarounds, and 10 real-world regex patterns with examples.
HTTP Status Codes
All 1xx–5xx status codes with descriptions, use cases, and examples.
Docker Commands
Docker, docker-compose, and containerization best practices.
SQL Queries
SELECT, JOINs, aggregations, window functions, and common SQL patterns.
Browse All Guides
17+ cheatsheets for Bash, Docker, JavaScript, Python, and more.
Common Developer Workflows
Debugging an API Response
Your API returns a massive blob of JSON. Paste it into JSON Formatter to pretty-print and validate. If the response includes a JWT token, drop it into the JWT Decoder to check headers, claims, and expiration. Need to hash the API key for logs? Use Hash Generator.
Building Data Validation Logic
You're implementing email or phone validation. Sketch the regex in Regex Tester with live matching and flag controls. Test against edge cases (subdomains, extensions). Once satisfied, copy the pattern and integrate it into your code.
Container DevOps Setup
You have a long `docker run` command with volume mounts, environment variables, and port mappings. Paste it into Docker Run → Compose to instantly convert it to a docker-compose.yml file. Or use the Docker Cheatsheet to look up the syntax for multi-stage builds or health checks.