Render Url

Render a URL in headless Chromium and extract structured JSON (title, headings, links, images, meta, text) OR RAW HTML. Use this whenever the task needs the post-JavaScript content of a web page. SPAs, JS-rendered content, or any page where a plain HTTP fetch would miss content added by

A two-stage, deterministic CLI toolchain: render a URL in real Chromium (via Playwright), then extract structured data from the rendered HTML. No crawling, no LLM/AI-based interpretation in the core pipeline — pure browser rendering + structural DOM parsing. An optional, off-by-default --answer-questions flag adds LLM-based application-question answering (see below).

Setup

Install the CLI from PyPI and the Chromium browser it drives. Do this once per environment; skip if render-url --help already succeeds.

bash

pip install render-url
playwright install chromium

Only if you'll use --answer-questions (optional, LLM-based — see below):

bash

pip install "render-url[qa]"   # adds the anthropic SDK

Commands

One-shot: render + extract in a single call (preferred for most tasks)

bash

render-and-parse "https://example.com"

Prints one JSON object to stdout with the extracted structured data (title, headings, links, images, meta, text). Also writes rendered_page_N.json (raw render) and parsed_page_N.json (extracted data) to the current directory.

Useful flags:

• --selector "<css>" — scope extraction to one element (e.g. --selector "article", --selector "#main-content").
• --timeout <ms> — navigation timeout (default 30000).
• --wait-until networkidle — wait for network idle instead of the default load (use only if the page is known to settle onto a quiet network; SPAs with polling/websockets may hang).
• --no-strip-whitespace — preserve raw whitespace in extracted text instead of collapsing it.
• --verbose — log each pipeline step to stderr.
• --log-json — pretty-print the full result JSON to stderr as well.
• --detect — run deterministic page classification (see below) before rendering. Useful for job-application URLs, where the page may turn out to be a CAPTCHA, login wall, error page, closed job, or bot/security challenge instead of the actual application. If the page classifies as anything other than APPLICATION, parsing is skipped and the classification is returned instead of extracted page data.
• --answer-questions — after parsing, use an LLM to identify application/screening questions in the extracted text and answer them from a resume (see below). Off by default; the only flag in this toolchain that calls an LLM or makes network calls beyond rendering the page. Requires --detect also be passed — render-and-parse rejects --answer-questions on its own with an invalid_input error, before rendering anything.

Application detection (--detect)

Runs entirely deterministic checks (no LLM/AI) against the rendered DOM and HTTP status: CAPTCHA, bot/security challenge (with a short navigate → wait → inspect → wait → inspect retry loop), login wall, HTTP/rendered error, closed/expired job, then an application-form evidence score. Output gains these fields:

json

{
  "status": "APPLICATION",
  "reason": "application_form_detected",
  "detector": {
    "captcha": false,
    "login": false,
    "bot_challenge": false,
    "error": false,
    "closed_job": false,
    "form_detected": true
  },
  "form": {"count": 1, "inputs": 17, "textareas": 2, "selects": 3, "file_inputs": 1},
  "redirected": true
}

status is one of APPLICATION, CAPTCHA, LOGIN, ERROR, CLOSED_JOB, BOT_CHALLENGE, NO_FORM. When status is anything other than APPLICATION, html/data come back null — the page was never worth fully parsing. Thresholds, keyword lists, and challenge-wait timing are configurable via the "detector" section of config.json (see config.example.json).

Answering application questions with an LLM (--answer-questions, optional)

The only LLM-calling feature in this toolchain — off by default, and everything above still works without it. When enabled, after parsing it sends the extracted page text to an LLM (Anthropic Claude by default) to identify the application/screening questions on the page and answer each one from a resume.

Always pass --detect together with --answer-questions. The LLM only ever runs on a page --detect classified APPLICATION — this keeps it from being called (and spending API credits) on a CAPTCHA, login wall, closed job, or bot-challenge page. render-and-parse --answer-questions without --detect fails immediately with an invalid_input error, before Chromium even launches.

bash

cp .env.example .env     # fill in ANTHROPIC_API_KEY
# write the candidate's resume as Markdown to resume.md (gitignored, never commit it)
render-and-parse "https://example.com/job/123" --detect --answer-questions

Flags: --resume <path> (default resume.md), --qa-provider (default/only anthropic), --qa-model (short name like sonnet5, opus5, or a full model ID; default sonnet5), --qa-api-key (falls back to ANTHROPIC_API_KEY env/.env). Also settable via "answer_questions"/"resume_path"/"qa_provider"/"qa_model" in the "parser" section of config.json.

On success (page classified APPLICATION), data gains:

json

{
  "application_questions": ["Are you legally authorized to work in Canada?"],
  "answers": [
    {"question": "Are you legally authorized to work in Canada?", "answer": "Yes."}
  ]
}

If the resume can't answer a question confidently, "answer" is null rather than a guess. If the page wasn't classified APPLICATION, or QA fails for any other reason (missing resume, missing API key, LLM error), the deterministic parse result is still returned, with a top-level "qa_error" string instead — the gate and any QA failure both leave the parse itself untouched. (Using the two-stage render-url --detect → parse-html --answer-questions pipeline instead of render-and-parse? The same rule applies: parse-html reads the "status" field render-url --detect wrote into its input file, and skips the LLM call the same way if it's missing or not APPLICATION.)

Two-stage: render and parse separately (when you need the raw HTML too)

bash

render-url "https://example.com"              # -> rendered_page_1.json (includes raw "html" field)
parse-html rendered_page_1.json                # -> parsed_page_1.json (structured extraction)

# or piped, no intermediate file needed:
render-url "https://example.com" | parse-html -

render-url alone is useful when you need the raw post-JS HTML itself (e.g. to feed a different extraction step), not just the structured fields parse-html produces.

Raw HTML output (render-url --raw-html)

Use this when you need the page's rendered HTML itself (clean, pretty-printed <body> markup with no scripts or CSS) — to grep it, feed it to your own extraction, or inspect markup the structured parse drops — and don't want to unwrap it from JSON.

bash

render-url "https://example.com" --raw-html --no-detect > page.html

Default recipe: use --raw-html --no-detect together unless you specifically want the page classified. (--no-detect matters because a project config.json may set "detect": true, which would otherwise turn a plain job-listing page into a NO_FORM JSON result.)

Exactly how to use it:

• Pass --raw-html to render-url only (not render-and-parse or parse-html, which don't accept it). Every other render-url flag (--timeout, --wait-until, --stabilization, --detect, --output-dir, ...) still works alongside it.
• On success, stdout is the post-JS <body> markup and nothing else — HTML only: no <head>, no <script>/<style>/<link>/<noscript>/<template> elements, and no inline style/on* attributes. The markup is pretty-printed (one tag per line, indented). Because <head> is dropped, <title>, meta tags and JSON-LD data are not in this output; use render-and-parse (or render-url without --raw-html) if you need them. It is also saved to <output-prefix>_N.html (default rendered_page_N.html, auto-incremented). Redirect stdout to a file or read the saved file; don't try to json.loads it.
• Always check what you got. If no HTML could be produced, stdout is the normal JSON result instead ({"ok": false, "error": {...}}, or with --detect, a status other than APPLICATION and "html": null), and the saved file is .json rather than .html. Treat output beginning with {"ok": as the failure/classification case and read error or status/reason. Real HTML begins with <.
• If the HTML looks like an empty shell for a JS-heavy page, re-run with a larger --stabilization (e.g. 3000) or --wait-until networkidle.
• Don't combine with --detect unless you want the page gated: with --detect (or "detect": true in config.json), any non-APPLICATION page returns JSON, not HTML. If config.json enables detect and you need HTML regardless (e.g. a plain job listing page classifies as NO_FORM), pass --no-detect.
• Clean up the auto-incremented .html files when done.

Output schema (parse-html / render-and-parse)

json

{
  "ok": true,
  "source_url": "https://example.com",
  "title": "Example Domain",
  "data": {
    "headings": [{"level": 1, "text": "Example Domain"}],
    "links": [{"text": "More information...", "href": "https://iana.org/domains/example"}],
    "images": [{"src": "...", "alt": "..."}],
    "meta": {"viewport": "width=device-width, initial-scale=1"},
    "text": "Example Domain This domain is for use in illustrative examples..."
  },
  "selector_matched": null,
  "error": null
}

On failure: ok: false and error: {"type": "...", "message": "..."}. Error types include invalid_url, navigation_timeout, navigation_error, missing_html, invalid_config, parse_error. Always check ok before reading data.

Notes

• Exactly one URL per invocation — no crawling or link-following. To process multiple URLs, call the command once per URL.
• Output files (rendered_page_N.json, parsed_page_N.json, or rendered_page_N.html with --raw-html) auto-increment and never overwrite existing files in the working directory — clean these up if not needed after use.
• All output is a single JSON object on stdout (except render-url --raw-html, which prints pretty-printed body-only HTML on success); diagnostics only ever go to stderr, so stdout is always safe to parse directly.
• --answer-questions is the sole exception to "no LLM/AI" above — it's opt-in and every other command/flag remains deterministic and offline.