JavaScript can create anonymous pastes directly, but account Bearer tokens do not belong in a public browser bundle. Keep privileged automation on a trusted server or local script and expose only the minimum operation a browser actually needs.
Create an anonymous paste with fetch
POST JSON to the fixed HTTPS endpoint and set Content-Type. Use AbortController to bound the request, check response.ok before parsing success fields, and display a useful message for 400 or 429 responses.
Keep account tokens out of browsers
Anything delivered to a browser can be read by the user, extensions, developer tools, or injected scripts. Use account tokens only in trusted local or server-side JavaScript and never embed them in frontend configuration.
Practical next step: API quickstart - Learn the endpoint lifecycle.
Handle CORS and content safely
Pastebin.ai exposes CORS headers on eligible read and preflight API responses. A successful fetch returns data, not trusted markup or code. Render retrieved text with textContent rather than injecting it as HTML.
Test cancellation and retries
Cancel requests when a view is abandoned, honor Retry-After, and avoid automatically repeating POST without an idempotency design. Test with short-lived synthetic content and delete test pastes afterward.
Primary sources and further reading
These references support the standards and implementation concepts used in Use the Pastebin API with JavaScript. Product behavior is checked separately against Pastebin.ai.