Use Go’s chromedp to automate Chrome or Chromium, capture each supplied job-listing URL, and save the resulting image. The reliable pattern is one page at a time: navigate, wait for a page-specific condition, capture the viewport or full page, write the bytes, and record failures without losing the rest of the batch. chromedp drives a browser through Chrome DevTools Protocol; it does not include the browser.
What you need before capturing pages
- A Go installation and a Go module for your program.
- A compatible Chrome or Chromium binary in the execution environment, or access to an existing DevTools endpoint. chromedp can launch a browser or connect to a remote endpoint, but does not bundle one.
- An explicit list of listing-page URLs. This example processes only the URLs provided; it does not discover or crawl additional listings.
- A readiness condition and capture scope suited to each target page. Job portals may render content differently or require authentication; no particular Indian portal or access behavior is assumed here.
Check the current rules and requirements for each site before automating it. The available technical documentation does not establish the access terms, login behavior, or robots rules of any specific job portal.
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Set up a Go project
Create a directory and initialize a module, then add chromedp:
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cd job-shots
go mod init example.com/job-shots
go get github.com/chromedp/chromedpMake sure Chrome or Chromium is installed and available to the process. For reproducibility, record the Go module version and browser version used in your environment; check the API signatures against the chromedp version pinned in your project.
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Bulk capture with Go chromedp
This runnable starter processes URLs sequentially, waits for a visible selector, captures the full page as PNG, and continues after individual failures. Supply the URLs as command-line arguments. Change the readiness selector to one verified on each target portal; a selector that is not present will cause that page to time out.
package main
import (
"context"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"time"
"github.com/chromedp/chromedp"
)
func main() {
if len(os.Args) < 2 {
log.Fatal("usage: go run . URL [URL ...]")
}
if err := os.MkdirAll("shots", 0o755); err != nil {
log.Fatalf("create output directory: %v", err)
}
// The allocator launches Chrome/Chromium using the environment's
// available browser configuration. Set up a remote allocator instead
// if connecting to an existing DevTools endpoint.
allocCtx, cancelAllocator := chromedp.NewExecAllocator(context.Background(), chromedp.DefaultExecAllocatorOptions[:]...)
defer cancelAllocator()
browserCtx, cancelBrowser := chromedp.NewContext(allocCtx)
defer cancelBrowser()
failed := 0
for i, rawURL := range os.Args[1:] {
url := strings.TrimSpace(rawURL)
if url == "" {
log.Printf("skip argument %d: empty URL", i+1)
failed++
continue
}
ctx, cancel := context.WithTimeout(browserCtx, 45*time.Second)
var png []byte
err := chromedp.Run(ctx,
chromedp.Navigate(url),
// Replace this with a visible, meaningful selector for the site.
chromedp.WaitVisible("body", chromedp.ByQuery),
chromedp.FullScreenshot(&png, 100),
)
cancel()
if err != nil {
log.Printf("capture failed for %q: %v", url, err)
failed++
continue
}
name := fmt.Sprintf("%03d.png", i+1)
path := filepath.Join("shots", name)
if err := os.WriteFile(path, png, 0o644); err != nil {
log.Printf("write %q for %q: %v", path, url, err)
failed++
continue
}
log.Printf("saved %s from %s", path, url)
}
if failed > 0 {
log.Printf("finished with %d failed or skipped page(s)", failed)
os.Exit(1)
}
}Run it with one or more listing URLs:
go run . 'https://example.com/jobs/role-a' 'https://example.org/careers/role-b'The example uses body as a generic wait so the starter can run on ordinary documents. For useful job-page captures, replace it with a selector that signals the relevant listing content is visible—for example, a listing container or page heading confirmed in that site’s rendered DOM. A visible body alone does not prove that dynamic results have finished loading.
Failure policy and output identity
The loop gives each URL its own 45-second context deadline. A failed navigation, wait, or capture is logged with its URL; later URLs still run. Files use their input position for stable names, so the same input order produces the same names. For recurring or audit-sensitive batches, also write a manifest mapping each filename to its original URL and capture outcome.
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Choose the screenshot scope and format
chromedp offers different capture actions; choose based on what the image needs to show rather than treating them as interchangeable.
| Capture action | What it captures | Use it when |
|---|---|---|
chromedp.CaptureScreenshot |
The current viewport. | You need the visible browser window rather than content below the fold. |
chromedp.Screenshot |
A selected DOM element. | You need a particular listing card, results region, or other node. |
chromedp.ScreenshotScale |
A selected element at a specified scale. | You need to control the scale of an element capture. |
chromedp.FullScreenshot |
The page beyond the viewport. | You need a full-page image; the documented example notes that this overrides device-emulation settings. |
The documented screenshot behavior uses JPEG when the quality value is below 100 and PNG at quality 100. Confirm the exact behavior and available signatures for the version you pin. The sample uses full-page PNG. For a viewport capture, replace the full-page action with chromedp.CaptureScreenshot(&png); for element capture, use the selector-based screenshot action and handle the target element’s selector explicitly.
Make readiness checks match each portal
Fixed sleeps are easy to write but can be too short on slow pages and waste time on fast ones. Prefer waits tied to meaningful page state or a selector that indicates the listing content is ready. The appropriate condition depends on the target site’s markup and dynamic loading behavior.
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- Inspect a representative page and choose a selector that appears only when the intended listing region is available.
- Check whether the page needs authentication, user-driven state, or a particular viewport before capture.
- Set a deadline per page so a slow or stalled URL does not hold up the remaining batch indefinitely.
- Validate the saved images on representative pages and browser versions; selector visibility does not guarantee every image or asynchronously loaded field is complete.
Batch size, performance, and reliability
Start with sequential processing, as in the sample. It keeps the browser workflow simple and avoids creating unnecessary load on third-party portals. If measured throughput requires concurrency, add a bounded worker pool rather than launching an unbounded browser task for every URL. Concurrent targets consume resources, and no performance benchmark or safe concurrency limit has been established for this specific use case.
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For larger runs, retain per-page timeouts and log the URL, output path, and error. Consider retrying only failures that appear transient, and keep retries bounded so a persistent block or broken page does not generate repeated requests. Keep the original URL list so failed entries can be reviewed or rerun deliberately.
Troubleshooting common failures
Chrome or Chromium does not start
chromedp needs a compatible browser binary when launching locally. Install Chrome or Chromium in the runtime and verify that the process can access it; alternatively configure a connection to an existing DevTools endpoint.
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The page times out waiting for a selector
The selector may not exist on that portal, may differ by page state, or may appear only after authentication or another interaction. Inspect the rendered page, choose a site-appropriate readiness condition, and check the target page’s requirements. Do not assume a selector from one job site works on another.
The screenshot is blank or misses listings
A successful navigation is not necessarily proof that the listings have rendered. Wait for a meaningful visible listing element rather than only the document body, and verify the saved output on that page. Dynamic content and user-driven state may require portal-specific handling.
One bad URL stops the whole batch
Ensure the per-page error path logs the failing URL and continues the loop, as in the sample. If the batch should instead be all-or-nothing, collect results first and apply that policy after processing; the starter intentionally preserves successful captures when another URL fails.
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Capture dimensions or output differ from expectation
Confirm whether you chose viewport, element, or full-page capture and check the behavior against your pinned chromedp version. In particular, the documented FullScreenshot behavior overrides device-emulation settings, and screenshot quality affects PNG versus JPEG output.
Or skip the browser setup
ScreenshotNeo offers a website screenshot API and MCP server. A single GET request can return an image or PDF; the API also supports bulk capture of up to 100 URLs per call. For one URL, the cURL example is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/jobs/role-a -o shot.webpSee the ScreenshotNeo API documentation for authentication and options. Its cookie-banner, newsletter-popup, and chat-widget removal runs before capture and can be turned off; bot checks, blank pages, timeouts, failed loads, and cache hits are not billed. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for AI agents. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for the free plan to try it.
Frequently asked questions
Does this program find Indian job listings automatically?
No. It captures only the URLs you pass to it; it does not search portals or discover additional listing pages.
Can I use the same readiness selector on every job portal?
Only if the target pages share that rendered element and it reliably indicates readiness. Verify the selector for each portal and relevant page state.
Can I capture a listing card instead of the whole page?
Yes. Use chromedp’s selector-based element screenshot action with a selector for the card or results region, and confirm the selected element exists before capture.
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