开发者工具
JSON Formatter
Format and beautify JSON instantly in your browser.
JSON Validator
Validate JSON syntax with clear error messages.
Base64 Encoder
Encode and decode Base64 strings and files privately.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
JWT Decoder
Decode JWT tokens and inspect header and payload safely.
Regex Tester
Test regular expressions against sample input with highlights.
CSS Minifier
Minify CSS to reduce file size for production deployments.
JS Minifier
Minify JavaScript for smaller bundles and faster page loads.
URL Encoder
Encode and decode URL-safe strings and query parameters.
UUID Generator
Generate UUIDs for database keys, tests, or APIs.
Cron Parser
Parse and explain cron expressions in plain English.
HTML Formatter
Beautify and indent HTML markup with proper nesting.
XML Formatter
Format and beautify XML documents with proper indentation.
XML Validator
Validate XML syntax and structure against schema rules.
Color Converter
Convert colors between HEX, RGB, HSL, and other formats.
Free Online Developer Tools for Daily Workflow
This developer toolkit collects the utilities programmers reach for constantly: JSON formatter and validator, Base64 encoder, hash generator, JWT decoder, regex tester, CSS and JS minifiers, URL encoder/decoder, cron parser and generator, HTTP request builder, and many more. Every tool is focused, fast, and runs in your browser so sensitive data like tokens and payloads never leaves your machine.
These tools are built for quick, everyday debugging, not for hosting a production workflow. Paste a JWT, inspect its claims, close the tab. Format a JSON payload before posting it. Verify a regex against sample input. Nothing to install, nothing to sign up for, and nothing sent to a server.
Why These Developer Tools
Client-Side Processing
JWT tokens, API payloads, production JSON, all processed locally. Nothing uploaded, nothing logged, safe for sensitive data.
Clean, Focused UI
Each tool does one thing. No dashboard to navigate, no feature menu to learn. Paste input, see output.
Handles Realistic Payload Sizes
Tools handle multi-megabyte JSON, log files, and large text inputs without a server timeout. Limits depend on your browser memory.
No Install, No CLI
Get the same quick debugging checks you would run with jq, openssl, or pbcopy, without opening a terminal.
Common Developer Tasks
Developers typically use these tools to:
- Format and validate a messy JSON response from a production API during debugging.
- Decode a JWT token to inspect its claims without writing a script or exposing it to a server.
- Test a regex pattern against real input data before committing it to code.
- Generate an SHA-256 hash of a string for integrity checks, caching keys, or signing.
- Encode a binary file as Base64 for embedding in a data URL or API request body.
How to Use the Developer Tools
Every developer tool follows the same pattern:
- Pick a tool. Choose the formatter, encoder, validator, or tester from the cards above.
- Paste your input. Drop your JSON, JWT, string, or payload into the input field. All tools accept direct paste.
- Copy the result. Output appears instantly. Click to copy to clipboard or download as needed.