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JavaScript Examples – Health Fitness API

You can interact with Health Fitness API using modern JS in browsers or Node.js. Below are multiple methods covering GET and POST requests.

1. Using fetch (modern JS)

GET request example:

const apiKey = "YOUR_API_KEY";
const url = "https://api.hefitapi.com/api/v1/bmi?height=178&weight=82&units=metric&lang=en";

fetch(url, {
  headers: {
    "X-API-Key": apiKey
  }
})
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(err => console.error("Error:", err));

POST request example:

const postUrl = "https://api.hefitapi.com/api/v1/bmi/post";

const payload = {
  height: 178,
  weight: 82,
  units: "metric"
};

fetch(postUrl, {
  method: "POST",
  headers: {
    "X-API-Key": apiKey,
    "Content-Type": "application/json"
  },
  body: JSON.stringify(payload)
})
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(err => console.error("Error:", err));

2. Using axios (browser & Node.js)

Install in Node.js:

npm install axios

GET request example:

const axios = require("axios");

const apiKey = "YOUR_API_KEY";
const url = "https://api.hefitapi.com/api/v1/bmi";

axios.get(url, {
  headers: { "X-API-Key": apiKey },
  params: { height: 178, weight: 82, units: "metric", lang: "en" }
})
.then(response => console.log(response.data))
.catch(err => console.error("Error:", err));

POST request example:

axios.post("https://api.hefitapi.com/api/v1/bmi/post", {
  height: 178,
  weight: 82,
  units: "metric"
}, {
  headers: { "X-API-Key": apiKey, "Content-Type": "application/json" }
})
.then(response => console.log(response.data))
.catch(err => console.error("Error:", err));

3. Using XMLHttpRequest (classic browser method)

GET request example:

const xhr = new XMLHttpRequest();
xhr.open("GET", "https://api.hefitapi.com/api/v1/bmi?height=178&weight=82&units=metric&lang=en");
xhr.setRequestHeader("X-API-Key", "YOUR_API_KEY");

xhr.onload = () => {
  if (xhr.status === 200) {
    console.log(JSON.parse(xhr.responseText));
  } else {
    console.error("Error:", xhr.statusText);
  }
};

xhr.send();

POST request example:

const xhrPost = new XMLHttpRequest();
xhrPost.open("POST", "https://api.hefitapi.com/api/v1/bmi/post");
xhrPost.setRequestHeader("X-API-Key", "YOUR_API_KEY");
xhrPost.setRequestHeader("Content-Type", "application/json");

xhrPost.onload = () => {
  if (xhrPost.status === 200) {
    console.log(JSON.parse(xhrPost.responseText));
  } else {
    console.error("Error:", xhrPost.statusText);
  }
};

xhrPost.send(JSON.stringify({ height: 178, weight: 82, units: "metric" }));

4. Async/Await Syntax (modern JS)

async function fetchBMI() {
  const apiKey = "YOUR_API_KEY";
  const url = "https://api.hefitapi.com/api/v1/bmi?height=178&weight=82&units=metric&lang=en";

  try {
    const response = await fetch(url, {
      headers: { "X-API-Key": apiKey }
    });
    const data = await response.json();
    console.log(data);
  } catch (err) {
    console.error("Error:", err);
  }
}

fetchBMI();

5. Notes & Best Practices

  • Replace YOUR_API_KEY with your real API key.
  • lang parameter supports multi-language responses (en, fr, de, es, etc.).
  • Handle errors and exceptions, especially for async operations.
  • Use axios or fetch for modern front-end apps; XMLHttpRequest mostly for legacy support.
  • API responses include full JSON objects with risk signals, action plans, and _enterprise metadata when available.

Start integrating Health Fitness API into your Python apps today!

Health Fitness API Powering modern digital health infrastructure