Render, validate and generate Zebra ZPL label barcodes as PNG/PDF.
Labelixa API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Labelixa REST API reference: render and barcode endpoints, request/response headers, error codes and API-key authentication.
Details from labelixa.com.

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The Labelixa API is provided by Labelixa Guide (labelixa.com). Labelixa REST API reference: render and barcode endpoints, request/response headers, error codes and API-key authentication.
Yes. The Labelixa API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Labelixa API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Labelixa API supports CORS, so front-end JavaScript can call it directly.
Yes. The Labelixa API is served over HTTPS, so it's safe to use in production.