FastMinify Blog
Guides and tutorials for browser-based developer tools — minification, conversion, validation, SVG, DevOps and performance.
GraphQL SDL: Validate and Format a Schema Online
SDL syntax errors, schema review and formatting before merge — extends the existing GraphQL beautifier.
LLM API Cost: Batch API, Prompt Caching and Monthly Projection
Lower your OpenAI/Anthropic/Gemini bill: estimate input/output, model batch and caching in your calculations — verified rates, 100% local.
LLM Context Window: Size Your Prompts for GPT, Claude and Gemini
RAG, multi-turn agents, system prompts: calculate context-window usage and remaining headroom before calling the API.
When TOON Beats JSON for LLM Prompts (and When It Doesn't)
Honest guide: uniform tabular data, convert → count → price → context workflow; not a JSON/YAML replacement manifesto.
Count LLM Tokens and Estimate API Cost Locally (OpenAI, Claude, Gemini)
Before calling an LLM API: count tokens, estimate USD cost and check context-window fit — 100% in the browser without sending your prompt.
JSON Schema: Validate Data Online (Draft 2020-12)
Test API payloads and config files against JSON Schema Draft 2020-12 — errors pinpointed by JSON Pointer path, in the browser.
OpenAPI: Lint, Format and Structure a Maintainable API
operationId, tags, error responses: practical rules that prevent spec debt when you lint and format OpenAPI files online.
Validate OpenAPI 3 / Swagger Specs Online Before CI
Schema errors, broken $ref, missing responses: validate your OpenAPI 3.0–3.2 API contract in the browser.
JSON to YAML: When to Convert, Pitfalls and Online Tools
K8s, CI/CD, Ansible configs: convert JSON ↔ YAML in the browser without losing structure or types, then beautify the YAML.