# D3Codex

> A fast, modern, machine-readable reference for the Rocket D3 / Pick MultiValue database: TCL commands, PickBASIC and FlashBASIC, AQL, processing codes, and more. 2190 topics across 18 categories.

D3Codex is an independent, unofficial reference (it is not affiliated with Rocket Software). Every topic is a single web page, and is also available as structured JSON and clean Markdown through the API below. Appending nothing special is needed - the API mirrors every page.

## Check / lint D3 code

If you are asked to check, lint, or validate D3 / PickBASIC (PickBASIC / FlashBASIC) code, fetch the self-contained linter and run it: it finds compile-stopping errors and likely bugs WITHOUT executing the code, using the same engine as the on-site Checker.

- Linter module (zero-dependency ESM): https://d3codex.com/d3lint.mjs - `import { lintD3, lintSummary } from './d3lint.mjs'`, then `lintD3(source)` returns `[{line, severity, code, message, suggestion?}]`
- Full guide (how to run it, the diagnostic codes, and rules to apply if you cannot run code): https://d3codex.com/check-d3.md
- To open a program in the visual Annotator / Checker, base64url-encode its UTF-8 source into the URL hash: https://d3codex.com/tools/annotate/#s={base64url(source)} - append &focus=1 to open full-screen Focus (IDE) mode, the best default for "open file XXX in d3codex" (works on localhost too; see /check-d3.md)
- Claude Code users can install a skill that wraps all of the above (lookup + lint + open): https://d3codex.com/d3codex.skill.md - save it to ~/.claude/skills/d3codex/SKILL.md

## Tools

- [Conversion Lab](https://d3codex.com/tools/conversions/): decode OCONV / ICONV codes live (dates, money, time, case, hex)
- [Code Annotator + Linter](https://d3codex.com/tools/annotate/): paste D3 / PickBASIC to link every statement and function to its reference, and a built-in linter (the Checker) flags structural errors as you type
- [Error & Code Decoder](https://d3codex.com/tools/errors/): decode D3 error / log codes, SYSTEM(n) and ACCESS(n) function codes

## Browse by category

- [TCL](https://d3codex.com/category/tcl/): 600 topics
- [PickBASIC / FlashBASIC](https://d3codex.com/category/pickbasic-flashbasic/): 571 topics
- [Definitions](https://d3codex.com/category/definitions/): 141 topics
- [C Functions](https://d3codex.com/category/cfunctions/): 132 topics
- [ACCESS / AQL](https://d3codex.com/category/access/): 108 topics
- [Output Processor](https://d3codex.com/category/output-processor/): 105 topics
- [Attribute-Defining Items](https://d3codex.com/category/attributedefiningitem/): 93 topics
- [PROC](https://d3codex.com/category/proc/): 82 topics
- [Runoff](https://d3codex.com/category/runoff/): 65 topics
- [UNIX](https://d3codex.com/category/unix/): 57 topics
- [Processing Codes](https://d3codex.com/category/processingcodes/): 54 topics
- [System Files](https://d3codex.com/category/systemfiles/): 53 topics
- [FlashBASIC Debugger](https://d3codex.com/category/flashbasicdebugger/): 45 topics
- [Editor](https://d3codex.com/category/editor/): 42 topics
- [Update Processor](https://d3codex.com/category/updateprocessor/): 15 topics
- [Background / Phantom](https://d3codex.com/category/backgroundphantomprocess/): 11 topics
- [Introduction](https://d3codex.com/category/introduction/): 10 topics
- [Accumath](https://d3codex.com/category/accumath/): 6 topics

## API

- [API index](https://d3codex.com/api/index.json): endpoints, counts, and usage
- [Topic catalog](https://d3codex.com/api/topics.json): every topic with slug, title, summary, and links
- [Categories](https://d3codex.com/api/categories.json): categories with counts
- Per-topic JSON: https://d3codex.com/api/topics/{slug}.json (structured data plus full Markdown of the topic)
- Per-topic Markdown: append .md to any topic URL, e.g. https://d3codex.com/pickbasic-flashbasic/oconv-function.md

## Notes

- Content is the Rocket D3 10.3.4 reference merged with the 2016 manual; reference text and marks belong to their respective owners.
- Slugs are "{category}/{topic}", e.g. pickbasic-flashbasic/oconv-function. Its JSON is https://d3codex.com/api/topics/pickbasic-flashbasic/oconv-function.json
- The API is static and CORS-enabled; fetch it from anywhere, no key required.