Free Developer Tools, Generators and Fix Helpers

A focused hub for debugging OpenAI API request bodies, JSON payloads, model-parameter mismatches and AI coding agent prompts.

Tools and fixes for local stacks, environment files, ports, volumes, service health and reproducible Docker Compose debugging.

A practical Nginx hub for redirects, HTTPS checks, config snippets, reload safety and common production server errors.

Developer-focused SEO utilities for crawl control, sitemaps, headers, redirects and safe indexation checks.

A compact request-body example for debugging OpenAI API calls. Use it as a starting point, then validate parameters against the target model family.

Use this example to separate API behavior from frontend, SDK or framework code.

A starter local stack for PHP apps that need Nginx and MySQL. Review paths, ports and secrets before production.

A narrow path redirect example for Nginx. Test syntax and Location headers before using permanent redirects widely.

Generate a clean robots.txt file for crawlers, staging blocks, sitemap discovery, and simple SEO crawl control.

Check pasted XML sitemaps for basic structure, URL counts, loc values, lastmod format and common SEO mistakes.

Analyze pasted HTTP response headers for cache, redirects, security headers and content-type issues without making server-side requests.

Generate Nginx redirect snippets for moved pages, HTTPS upgrades, and canonical host cleanup.

Validate JSON, format it for reading, or minify it for compact API payloads without sending data to an external API.

Statically inspect an OpenAI API request body for common JSON and parameter mistakes before sending it to the API.

Generate starter docker-compose.yml snippets for common local development stacks.

Generate clean .env starter files for local development, app configuration, databases, Redis, mail and API placeholders.

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.

Redirect changes are small but risky. A safe workflow generates a narrow rule, validates Nginx syntax, tests Location headers and keeps rollback simple.

Local stacks are easier to maintain when docker-compose.yml describes services and .env.example documents configuration without real secrets.

A useful sitemap contains canonical, crawlable URLs that return 200 responses. It should not be a dump of every route your application can produce.

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.

Redirect loops happen when two layers keep sending the browser back and forth. The fix is to locate the layer producing each Location header.

Failed to fetch is a browser-level failure. You need to inspect the Network tab and server headers before changing application state code.

Undefined 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.