TypeScript Tone Checker

Node.js 18+ includes fetch. This example keeps the API key in an environment variable and sends it as a bearer token.

type ToneScore = [probability: number, tone: string, emoji: string];

interface ToneResponse {
  overall: ToneScore[];
  results: ToneScore[][];
  sents: string[];
}

async function checkTone(text: string): Promise<ToneResponse> {
  const apiKey = process.env.SAPLING_API_KEY;
  if (!apiKey) {
    throw new Error('Set SAPLING_API_KEY before running this example.');
  }

  const response = await fetch('https://api.sapling.ai/api/v1/tone', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${apiKey}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({text}),
  });

  if (!response.ok) {
    throw new Error(`Sapling API error ${response.status}: ${await response.text()}`);
  }

  return response.json() as Promise<ToneResponse>;
}

checkTone('Really stoked about this! Will it be ready by next week?')
  .then((result) => console.log(JSON.stringify(result, null, 2)))
  .catch(console.error);