Markdown → HTML

POST /api/md-to-html1 quota unit per call · cache hits free

Render CommonMark Markdown to HTML. Output is the rendered body only (no `<html>` shell) — drop it directly into your page or feed it through your sanitiser.

Converts Markdown source to HTML following the CommonMark specification. Output is the rendered HTML body only — no `<html>` / `<head>` / `<body>` shell — so you can drop it directly into your page template. GFM extensions (tables, strikethrough, task lists) are not yet enabled in this build. Plain CommonMark headings, paragraphs, lists, blockquotes, code fences, links, and emphasis all work. For untrusted input, run the output through `html-sanitize` before embedding it in your page.

Inputs

Name	Type	Default	Description
markdown*	file	—	The Markdown source document.

Response

Modes: text, json. Cache: yes (24h TTL).

Every response carries x-cache (HIT / MISS / BYPASS), x-cache-signature (stable across identical inputs), and the rate-limit headers listed below.

Quota & limits

Cost per call	1 unit against the 10,000-unit monthly quota. Cache hits are free — only cache misses decrement.
Burst limit	200 requests per rolling minute, shared across all tools.
Max request size	`5 MiB` (base64 inflates file payloads ~33% — the limit applies to the decoded bytes).
Max response size	`10 MiB`
Timeout	5s wall clock.
Rate-limit headers	`X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Burst-Limit` on every response; `X-Quota-Warning` once 80% of the monthly quota is spent; `Retry-After` on 429s.

Errors

Errors are JSON with an error string; schema failures add a details object (Zod's flattened field errors).

Status	When	Body
400	Input fails the tool's schema (wrong type, missing required field, malformed base64) or the file bytes can't be parsed as the expected format.	{ "error": "invalid inputs", "details": { "fieldErrors": { … } } }
401	Missing or invalid X-Api-Key / X-Account-Id headers (or no session when called from the browser).	{ "error": "unauthorized" }
404	Unknown tool id, or calling /api/* on the website hostname instead of api.xtract.bot.	{ "error": "not found" }
413	Request body over the tool's max request size, or an image header declaring more megapixels than the tool's pixel budget.	{ "error": "…exceeds maxRequestBytes…" }
415	Content-Type isn't application/json on the json-body transport.	{ "error": "unsupported content-type; expected application/json" }
429	Monthly quota or the 200/min burst limit exhausted. Check Retry-After and the X-RateLimit-* headers.	{ "error": "monthly quota exceeded", "monthRemaining": 0, … }
5xx	Conversion engine failure. Safe to retry; if it persists, the input is hitting a bug — please report it.	{ "error": "…" }

Code samples

Built from the hello example.

# Download or substitute the example input:
#   curl -O https://xtract.bot/examples/md-to-html/hello.md
MARKDOWN=$(base64 -w0 < hello.md)

curl -X POST https://api.xtract.bot/api/md-to-html \
  -H "Content-Type: application/json" \
  -H "Accept: text/plain" \
  -H "X-Account-Id: $XTRACT_ACCOUNT_ID" \
  -H "X-Api-Key: $XTRACT_API_KEY" \
  -d '{
  "markdown": "'"$MARKDOWN"'"
}'