Articles and hands-on tutorials about developer tools, LLM engineering and building in public.https://codes.im/enhttps://codes.im/en/blog/llm-api-cost-guide/https://codes.im/en/blog/llm-api-cost-guide/How input, output and cached tokens are billed, a worked monthly estimate for a support bot, and how much prompt caching, smaller models and output limits actually save.Thu, 22 Oct 2026 00:00:00 GMTllmcostprompt-cachingapihttps://codes.im/en/blog/reliable-json-from-llms/https://codes.im/en/blog/reliable-json-from-llms/Trailing commas, missing brackets, wrong fields? Here is how prompting, JSON mode, structured outputs, schema validation and automatic repair fit together — from least to most reliable.Thu, 22 Oct 2026 00:00:00 GMTllmjsonstructured-outputhttps://codes.im/en/blog/why-client-side-tools/https://codes.im/en/blog/why-client-side-tools/Developers paste tokens, logs and customer data into online tools every day. The reasoning behind “your data never leaves the browser”, how it’s built, and what it costs.Tue, 20 Oct 2026 00:00:00 GMTbuild-in-publicprivacyastrohttps://codes.im/en/blog/mcp-quickstart/https://codes.im/en/blog/mcp-quickstart/What MCP is, how it differs from function calling, how to configure local and remote servers, and how to fix the five most common errors.Sun, 18 Oct 2026 00:00:00 GMTmcpclaudecursoragenthttps://codes.im/en/blog/llm-tokens-explained/https://codes.im/en/blog/llm-tokens-explained/How tokenizers work, how tokens relate to words, why non-English text often uses more tokens, what counts toward the context window, and practical ways to cut token usage.Mon, 12 Oct 2026 00:00:00 GMTllmtokentokenizerhttps://codes.im/en/blog/curl-to-fetch-pitfalls/https://codes.im/en/blog/curl-to-fetch-pitfalls/The curl example from the API docs works, but your fetch call fails? A walk through the differences in method, Content-Type, query strings, auth, redirects and CORS.Mon, 05 Oct 2026 00:00:00 GMTcurlfetchhttpjavascripthttps://codes.im/en/blog/rag-chunking-guide/https://codes.im/en/blog/rag-chunking-guide/Chunking is the first gate of RAG quality. Concrete examples of chunk size, overlap, structure-aware splitting and metadata — and how to validate your choices with data.Mon, 28 Sep 2026 00:00:00 GMTragembeddingllmhttps://codes.im/en/blog/uuid-v4-vs-v7/https://codes.im/en/blog/uuid-v4-vs-v7/The trade-offs of auto-increment IDs, UUID v4 and UUID v7 — why random UUIDs slow down inserts, what v7 fixes, and the storage details that matter.Sun, 20 Sep 2026 00:00:00 GMTdatabaseuuidpostgresqlmysqlhttps://codes.im/en/blog/cron-cheatsheet/https://codes.im/en/blog/cron-cheatsheet/What the five fields mean, a quick-reference table of common schedules, the special day-of-month / day-of-week rule, and how Linux, Kubernetes, GitHub Actions and Spring differ.Sat, 12 Sep 2026 00:00:00 GMTcrondevopslinux