Translate in a specific language (per-call `lang`)

translate(), get(), instant(), stream(), getStreamOnTranslationChange(), and getParsedResult() all accept an optional lang parameter that bypasses the current and fallback languages.

Display a fixed-language label

Useful for brand names, marketing taglines, or accessibility labels that shouldn’t follow the active language:

import { Component, inject } from "@angular/core";
import { TranslateService } from "@ngx-translate/core";

@Component({ selector: "app-brand", template: `<span>{{ tagline }}</span>` })
export class BrandComponent {
  private translate = inject(TranslateService);
  tagline = this.translate.instant("brand.tagline", undefined, "en");
}

Pre-load a language before using instant() with an explicit lang

instant("KEY", undefined, "de") returns the key (and logs a one-shot console.warn per unloaded lang) if de translations are not yet loaded. Pre-load with use() (active switch), setTranslation() (manual), or load on demand:

// Option A: load and switch the active language
await firstValueFrom(this.translate.use("de"));
const text = this.translate.instant("greeting", undefined, "de"); // safe

// Option B: load without switching the active language
await firstValueFrom(this.translate.reloadLang("de"));
const text = this.translate.instant("greeting", undefined, "de"); // safe

// Option C: seed translations manually (no loader call)
this.translate.setTranslation("de", { greeting: "Hallo" });
const text = this.translate.instant("greeting", undefined, "de"); // safe

Live-update on a specific language’s changes

stream(key, undefined, lang) emits initially and re-emits whenever the specified language’s translations change — independent of the active language:

this.translate.stream("greeting", undefined, "de")
  .subscribe(text => console.log("German greeting is now:", text));

// Later, somewhere else:
this.translate.setTranslation("de", { greeting: "Servus" }, true);
// The subscriber above fires with "Servus".