Free developer tools for generating configs, validating JSON, explaining cron expressions, creating robots.txt files, checking sitemaps and headers, building redirects, reviewing OpenAI API request bodies and debugging common coding mistakes.
Generate a clean robots.txt file for crawlers, staging blocks, sitemap discovery, and simple SEO crawl control.
Open tool Apache .htaccess Redirect GeneratorCreate Apache .htaccess redirect rules for URL migrations, canonical host changes, and HTTP to HTTPS cleanup.
Open tool Nginx Nginx Redirect GeneratorGenerate Nginx redirect snippets for moved pages, HTTPS upgrades, and canonical host cleanup.
Open tool Cron Cron Expression ExplainerExplain common five-field cron expressions and catch basic schedule mistakes before adding a job to production.
Open tool JSON JSON Validator and FormatterValidate JSON, format it for reading, or minify it for compact API payloads without sending data to an external API.
Open tool OpenAI OpenAI API Request CheckerStatically inspect an OpenAI API request body for common JSON and parameter mistakes before sending it to the API.
Open tool Regex Regex Tester and ExplainerTest JavaScript regular expressions safely with try/catch, inspect matches, and see basic token explanations.
Open tool Docker Docker Compose GeneratorGenerate starter docker-compose.yml snippets for common local development stacks.
Open tool HTTP HTTP Headers CheckerAnalyze pasted HTTP response headers for cache, redirects, security headers and content-type issues without making server-side requests.
Open tool Sitemap Sitemap CheckerCheck pasted XML sitemaps for basic structure, URL counts, loc values, lastmod format and common SEO mistakes.
Open tool SSL SSL Checker Command HelperGenerate safe terminal commands for checking SSL certificates, HTTPS redirects, issuer, SAN names and expiry without storing credentials.
Open tool ENV .env GeneratorGenerate clean .env starter files for local development, app configuration, databases, Redis, mail and API placeholders.
Open tool JWT JWT DecoderDecode JWT header and payload locally, inspect common claims, and catch expiration or audience mistakes without sending tokens to an API.
Open tool Base64 Base64 Encoder and DecoderEncode and decode Base64 text locally for API payloads, token debugging, config values and quick automation tasks.
Open tool URL URL Encoder and DecoderEncode and decode URL components, query strings and redirect parameters without sending data to an external service.
Open tool Time Unix Timestamp ConverterConvert Unix timestamps to readable dates, generate current timestamps and debug log, JWT and scheduling issues.
Open tool UUID UUID GeneratorGenerate UUID v4 identifiers locally for tests, fixtures, database rows, API examples and automation scripts.
Open tool Hash Hash GeneratorGenerate SHA-256 hashes locally for text, cache keys, checksums and debugging workflows.
Open tool HTTP HTTP Status Code ExplainerExplain common HTTP status codes with likely causes, API debugging notes and practical verification commands.
Open tool cURL cURL Command BuilderBuild readable cURL commands for API requests with method, headers, JSON body and safe auth placeholders.
Open tool Nginx Nginx Config Validator HelperReview pasted Nginx snippets for common mistakes and generate safe test, reload and curl verification commands.
Open tool PHP PHP Error ExplainerPaste common PHP errors and get likely causes, fixes and verification steps for runtime, syntax and dependency problems.
Open tool JS JavaScript Error ExplainerPaste JavaScript browser or Node.js errors and get likely causes, fixes and debugging steps for common failure patterns.
Open tool Prompt AI Prompt DebuggerAnalyze coding-agent prompts for missing context, vague goals, unsafe instructions, unclear outputs and weak verification steps.
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