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To set up your environment, install the Speech SDK for JavaScript. If you just want the package name to install, run `npm install microsoft-cognitiveservices-speech-sdk`. For detailed installation instructions, see [Install the Speech SDK](../../../quickstarts/setup-platform.md?pivots=programming-language-javascript).
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1. Create a new folder `translation-quickstart` and go to the quickstart folder with the following command:
"\nDid you set the speech resource key and region values?");
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}
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synthesizer.close();
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synthesizer =null;
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},
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function (err) {
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console.trace("err - "+ err);
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synthesizer.close();
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synthesizer =null;
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});
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console.log("Now synthesizing to: "+ audioFile);
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});
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}());
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```
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1. In *SpeechSynthesis.js*, optionally you can rename *YourAudioFile.wav* to another output file name.
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1. To change the speech synthesis language, replace `en-US-AvaMultilingualNeural` with another [supported voice](~/articles/ai-services/speech-service/language-support.md#standard-voices).
All neural voices are multilingual and fluent in their own language and English. For example, if the input text in English is *I'm excited to try text to speech* and you set `es-ES-ElviraNeural`, the text is spoken in English with a Spanish accent. If the voice doesn't speak the language of the input text, the Speech service doesn't output synthesized audio.
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## Synthesize speech to a file
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To translate speech from a file:
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1. Create a new file named *synthesis.js* with the following content:
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```javascript
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import { createInterface } from "readline";
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import { SpeechConfig, AudioConfig, SpeechSynthesizer, ResultReason } from "microsoft-cognitiveservices-speech-sdk";
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functionsynthesizeSpeech() {
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const audioFile = "YourAudioFile.wav";
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// This example requires environment variables named "SPEECH_KEY" and "SPEECH_REGION"
"\nDid you set the speech resource key and region values?");
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}
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synthesizer.close();
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}, function(err) {
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console.trace("err - " + err);
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synthesizer.close();
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});
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console.log("Now synthesizing to: " + audioFile);
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});
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}
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synthesizeSpeech();
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```
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In *synthesis.js*, optionally you can rename *YourAudioFile.wav* to another output file name.
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To change the speech synthesis language, replace `en-US-AvaMultilingualNeural` with another [supported voice](~/articles/ai-services/speech-service/language-support.md#standard-voices).
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All neural voices are multilingual and fluent in their own language and English. For example, if the input text in English is *I'm excited to try text to speech* and you set `es-ES-ElviraNeural`, the text is spoken in English with a Spanish accent. If the voice doesn't speak the language of the input text, the Speech service doesn't output synthesized audio.
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1. Run your console application to start speech synthesis to a file:
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```console
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node SpeechSynthesis.js
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node synthesis.js
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```
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> [!IMPORTANT]
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> Make sure that you set the `SPEECH_KEY` and `SPEECH_REGION`[environment variables](#set-environment-variables). If you don't set these variables, the sample fails with an error message.
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## Output
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1. The provided text should be in an audio file:
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You should see the following output in the console. Follow the prompt to enter text that you want to synthesize:
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