Developer tools generator hub
Free Developer Tools, Generators and Fix Helpers
Practical tools for developers, sysadmins and AI automation builders. Generate configs, validate API payloads, explain errors, build SEO files and debug common development problems.
1
Generate
Create starter configs for Docker, Nginx, Apache redirects, robots.txt and automation workflows.
2
Validate
Check JSON payloads, OpenAI request shapes, cron expressions and regex patterns before shipping.
3
Fix
Use practical error entries, prompts and examples to debug coding agent and API failures faster.
Core Tool Areas
All developer tools
API
Code & API Tools
Validate JSON, review OpenAI API payloads and prepare cleaner request bodies.
Ops DevOps ToolsGenerate Docker Compose starters, explain cron jobs and reduce deployment mistakes.
SEO SEO & Website ToolsCreate robots.txt files and redirect snippets for real website maintenance tasks.
Fix AI Coding Fix HelpersUse structured fixes and prompts for coding agent, shell, SDK and API failures.
Start With These Tools
Browse full hubThe hub now includes generators, pasted-data checkers and command helpers with copy-paste ready output and local browser validation.
SEO
robots.txt Generator
Generate a clean robots.txt file for crawlers, staging blocks, sitemap discovery, and simple SEO crawl control.
Open tool Sitemap Sitemap CheckerCheck pasted XML sitemaps for basic structure, URL counts, loc values, lastmod format and common SEO mistakes.
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 Nginx Nginx Redirect GeneratorGenerate Nginx redirect snippets for moved pages, HTTPS upgrades, and canonical host cleanup.
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 Docker Docker Compose GeneratorGenerate starter docker-compose.yml snippets for common local development stacks.
Open tool ENV .env GeneratorGenerate clean .env starter files for local development, app configuration, databases, Redis, mail and API placeholders.
Open toolWhy HowProg.one
No generic AI content
Pages are built around concrete inputs, outputs, warnings and verification steps instead of vague advice.
Practical examples
Tools include examples for real workflows: redirects, cron schedules, API payloads, Docker stacks and regex checks.
Copy-paste ready outputs
Generated snippets are formatted for quick review and use in config files, terminals and documentation.
Useful for debugging and automation
The hub is designed for developers, sysadmins, site owners and AI coding agent users solving practical issues.
Practical Workflow Guides
Browse guidesUse these guides when a generator output needs a safe deployment, API debugging or SEO verification workflow around it.
OpenAI
Debug OpenAI API Request JSON Before Sending
Most API request bugs are easier to fix before the request is sent. Start with valid JSON, then check model-family parameters and only then debug application code.
Read guide Nginx Nginx 301 Redirect Workflow With Safe TestingRedirect changes are small but risky. A safe workflow generates a narrow rule, validates Nginx syntax, tests Location headers and keeps rollback simple.
Read guide Docker Docker Compose and .env Workflow for Local DevelopmentLocal stacks are easier to maintain when docker-compose.yml describes services and .env.example documents configuration without real secrets.
Read guide Sitemap XML Sitemap Indexing Checklist for DevelopersA useful sitemap contains canonical, crawlable URLs that return 200 responses. It should not be a dump of every route your application can produce.
Read guidePopular Error Fixes
Open fix libraryDebug common API, server, PHP and JavaScript failures with symptoms, likely causes, fixes and verification steps.
OpenAI
OpenAI max_tokens vs max_completion_tokens Error
This error usually appears when a request body mixes parameters from different OpenAI model families. Validate JSON first, then align token fields with the target model.
Open fix Nginx Nginx Redirect Loop FixRedirect loops happen when two layers keep sending the browser back and forth. The fix is to locate the layer producing each Location header.
Open fix JS JavaScript Failed to Fetch FixFailed to fetch is a browser-level failure. You need to inspect the Network tab and server headers before changing application state code.
Open fix PHP PHP Undefined Array Key FixUndefined array key warnings mean code reads a key that is not present. The fix is to check the data contract and handle missing values intentionally.
Open fixLatest Error Fixes and Guides
All fixesUse the article library for known API, shell, SDK and AI coding agent issues that need more context than a generator can provide.
