Learn NETLIFY-FUNCTIONS with Real Code Examples

# netlify/demo/hello.js
exports.handler = async function(event, context) {
    return {
        statusCode: 200,
        body: 'Hello, Netlify!'
    };
}

A simple Netlify Function responding with 'Hello, Netlify!' to HTTP requests.

# netlify/demo/query.js
exports.handler = async function(event, context) {
    const name = event.queryStringParameters.name || 'Guest';
    return {
        statusCode: 200,
        body: `Hello, ${name}!`
    };
}

Reads query parameters and responds with a personalized message.

# netlify/demo/json.js
exports.handler = async function(event, context) {
    return {
        statusCode: 200,
        body: JSON.stringify({ message: 'Hello, JSON!' })
    };
}

Returns a JSON object in the response body.

# netlify/demo/post.js
exports.handler = async function(event, context) {
    const data = JSON.parse(event.body || '{}');
    return {
        statusCode: 200,
        body: `Received: ${data.input}`
    };
}

Handles POST requests and parses JSON body.

# netlify/demo/env.js
exports.handler = async function(event, context) {
    const secret = process.env.MY_SECRET || 'No Secret';
    return {
        statusCode: 200,
        body: `Secret is: ${secret}`
    };
}

Uses environment variables in the function.

# netlify/demo/redirect.js
exports.handler = async function(event, context) {
    return {
        statusCode: 302,
        headers: { 'Location': 'https://www.netlify.com/' },
        body: ''
    };
}

Responds with a redirect to another URL.

# netlify/demo/error.js
exports.handler = async function(event, context) {
    try {
        throw new Error('Something went wrong');
    } catch(err) {
        return {
        statusCode: 500,
        body: err.message
        };
    }
}

Demonstrates returning an error response.

# netlify/demo/delay.js
exports.handler = async function(event, context) {
    await new Promise(resolve => setTimeout(resolve, 1000));
    return {
        statusCode: 200,
        body: 'Delayed Hello!'
    };
}

Returns a response after a simulated delay.

# netlify/demo/fetch.js
const fetch = require('node-fetch');
exports.handler = async function(event, context) {
    const res = await fetch('https://api.github.com');
    const data = await res.json();
    return {
        statusCode: 200,
        body: JSON.stringify(data)
    };
}

Fetches data from an external API and returns it.

# netlify/demo/headers.js
exports.handler = async function(event, context) {
    return {
        statusCode: 200,
        headers: { 'X-Custom-Header': 'NetlifyFunction' },
        body: 'Hello with headers'
    };
}

Returns custom HTTP headers in the response.