Developer Tools
Free developer tools to format JSON, test regular expressions, decode JWT tokens, and generate Dockerfiles. Fast online coding utilities.
Available Developer Tools (20)
JSON Formatter
Format, validate, parse, and beautify JSON online. Instant syntax error detection, minify, tree view, and pretty print for developers. 100% free, private in-browser.
Regex Tester
Test and debug regular expressions instantly. Supports multiple regex flavors including JavaScript, Python, and PHP. Perfect for validation patterns and text matching.
JWT Decoder
Decode and parse JWT tokens instantly in your browser. Inspect header, payload claims, and signature without sending tokens to any server. 100% secure.
URL Encoder/Decoder
Encode and decode URLs instantly. Handle special characters, spaces, and international characters. Essential for API development, sharing URLs safely, and debugging.
Lorem Ipsum Generator
Generate custom Lorem Ipsum placeholder text by paragraphs, words, or sentences for web design, mockups, and typography.
AI Cron Expression Generator
Generate and explain crontab schedule expressions using plain English and AI. Instant cron schedule calculator, next execution times, and syntax validator. 100% free.
HTTP Header Checker
Check and analyze HTTP response headers, security headers (CSP, HSTS, X-Frame-Options), server type, and SSL status for any website URL.
Token Calculator
Count tokens and estimate API costs for GPT-4o, Claude 3.5, Gemini, and Llama models in real-time. Calculate prompt and completion costs.
Color Palette Generator
Generate harmonious color palettes, extract colors from images, and create trending color schemes for UI/UX design, web, and branding.
API Response Formatter
Format, parse, and beautify REST API responses (JSON, XML, HTML, YAML). Inspect response status codes, headers, and payloads with syntax highlighting.
AI JSON to TypeScript Converter
Convert JSON structures to type-safe TypeScript interfaces using AI
AI SQL Query Builder & Beautifier
Format, beautify, and build SQL queries using AI patterns
JWT Token Expiry Calculator
Calculate remaining lifetime, human-readable expiration timestamp, and issued-at date from any JSON Web Token (JWT) string.
Environment Variable Generator
Generate and manage environment variables
AI Postman Collection Generator
Generate Postman collections for API testing using AI schemas
AI Dockerfile Generator
Generate secure, production-ready, multi-stage Dockerfiles for Node.js, Python, React, Go, Rust, and Java using AI best practices.
cURL to Axios Converter
Convert cURL commands to multiple programming languages
HTTP Status Code Explainer
Comprehensive guide to HTTP status codes
HTML Validator
Validate HTML5 code against W3C standards. Find missing closing tags, unclosed attributes, and syntax errors with real-time error highlighting.
CSS Validator
Validate CSS code against W3C standards instantly. Detect syntax errors, unused rules, and browser compatibility warnings with real-time error highlighting.
Why Choose Our Developer Tools?
DailyTools247 provides fast, secure, browser-first developer tools designed with privacy-forward defaults. All file conversions, calculations, compression routines, and text formatting run 100% locally in your browser memory where possible, with zero file storage on remote servers.
Key benefits include zero signup or account creation requirements, no intrusive watermark overlays, no daily usage limits, and full responsiveness across mobile, tablet, and desktop devices.
Frequently Asked Questions
Q: Are DailyTools247 developer tools suitable for production debugging?
Yes. Developers, DevOps engineers, and QA specialists use our JSON formatters, JWT decoders, regex testers, and cURL converters daily for rapid API diagnostics, payload validation, and syntax formatting.
Q: Do developer utilities store my tokens, secrets, or .env files?
No. All JSON formatting, regex pattern evaluation, JWT decoding, and environment variable generation occurs entirely in client-side memory. Sensitive authorization tokens and API secrets never touch any external server.
Q: How does the cURL to Axios Converter work?
It parses raw cURL command strings, extracts HTTP methods, target URLs, request headers, query parameters, and JSON payloads, and converts them into clean, type-safe JavaScript Axios or Fetch code snippets.
Q: Can I convert complex JSON schemas into TypeScript interfaces?
Yes. The AI JSON to TypeScript Converter recursively traverses nested JSON objects and arrays to generate clean, strongly typed TypeScript interfaces with optional fields, proper types, and exported definitions.
Q: What is the benefit of using the HTTP Header Checker and JWT Expiry tool?
The HTTP Header Checker audits security headers (HSTS, CSP, X-Frame-Options) on live servers, while the JWT Expiry tool inspects iat, exp, and nbf timestamps to identify expired or invalid authentication tokens quickly.