Learn Fastly-compute-edge - 10 Code Examples & CST Typing Practice Test

Fastly Compute@Edge is a high-performance, serverless edge computing platform that allows developers to deploy code closer to users, enabling low-latency web experiences and fast content delivery.

View all 10 Fastly-compute-edge code examples →

Simple Fastly Compute@Edge Function (JavaScript)Fastly Edge Function with JSON Response Fastly Edge Function with Query Parameters Fastly Edge Function with POST Body Fastly Edge Function with Headers Fastly Edge Function Redirect Fastly Edge Function Error Handling Fastly Edge Function Delayed Response Fastly Edge Function Fetch External API Fastly Edge Function Conditional Response

Learn FASTLY-COMPUTE-EDGE with Real Code Examples

Updated Nov 25, 2025

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Code Sample Descriptions

Simple Fastly Compute@Edge Function (JavaScript)

# fastly/demo/main.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response('Hello, Fastly!', { status: 200 })
}

A simple Fastly Compute@Edge function responding with 'Hello, Fastly!' to HTTP requests.

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Fastly Edge Function with JSON Response

# fastly/demo/json.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response(JSON.stringify({ message: 'Hello, JSON!' }), {
        status: 200,
        headers: { 'Content-Type': 'application/json' }
    })
}

Returns a JSON response from a Fastly Edge function.

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Fastly Edge Function with Query Parameters

# fastly/demo/query.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const url = new URL(request.url);
    const name = url.searchParams.get('name') || 'Guest';
    return new Response(`Hello, ${name}!`, { status: 200 })
}

Reads query parameters and returns a personalized message.

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Fastly Edge Function with POST Body

# fastly/demo/post.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const data = await request.json().catch(() => ({}));
    return new Response(`Received: ${data.input || ''}`, { status: 200 })
}

Handles POST requests and parses JSON body.

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Fastly Edge Function with Headers

# fastly/demo/headers.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response('Hello with headers', {
        status: 200,
        headers: { 'X-Custom-Header': 'FastlyEdge' }
    })
}

Returns a response with custom headers.

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Fastly Edge Function Redirect

# fastly/demo/redirect.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return Response.redirect('https://www.fastly.com', 302)
}

Redirects the request to another URL.

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Fastly Edge Function Error Handling

# fastly/demo/error.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    try {
        throw new Error('Something went wrong')
    } catch(err) {
        return new Response(err.message, { status: 500 })
    }
}

Handles errors and returns a 500 response.

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Fastly Edge Function Delayed Response

# fastly/demo/delay.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    await new Promise(resolve => setTimeout(resolve, 1000))
    return new Response('Delayed Hello!', { status: 200 })
}

Returns a response after a simulated delay.

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Fastly Edge Function Fetch External API

# fastly/demo/fetch.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const response = await fetch('https://api.github.com')
    const data = await response.json()
    return new Response(JSON.stringify(data), {
        status: 200,
        headers: { 'Content-Type': 'application/json' }
    })
}

Fetches data from an external API and returns it.

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Fastly Edge Function Conditional Response

# fastly/demo/method.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    if(request.method === 'POST') {
        return new Response('POST received', { status: 200 })
    } else {
        return new Response('GET received', { status: 200 })
    }
}

Responds differently based on request method.

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Frequently Asked Questions about Fastly-compute-edge

What is Fastly-compute-edge?

Fastly Compute@Edge is a high-performance, serverless edge computing platform that allows developers to deploy code closer to users, enabling low-latency web experiences and fast content delivery.

What are the primary use cases for Fastly-compute-edge?

Dynamic content generation at the edge. Real-time personalization for websites and apps. Security enforcement (e.g., bot mitigation, access control). A/B testing and feature flagging without hitting origin. API responses caching and optimization at edge nodes

What are the strengths of Fastly-compute-edge?

Ultra-low latency by running code at the edge. Reduces origin server load. High-performance, event-driven execution. Tight integration with Fastly CDN. Supports modern WebAssembly runtimes for multiple languages

What are the limitations of Fastly-compute-edge?

Stateless by design; no persistent storage. Limited execution duration and memory per request. Requires understanding of edge computing concepts. Debugging and local testing is less straightforward than cloud environments. Vendor lock-in due to Fastly-specific platform features

How can I practice Fastly-compute-edge typing speed?

CodeSpeedTest offers 10+ real Fastly-compute-edge code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Simple Fastly Compute@Edge Function (JavaScript)

# fastly/demo/main.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response('Hello, Fastly!', { status: 200 })
}

A simple Fastly Compute@Edge function responding with 'Hello, Fastly!' to HTTP requests.

Let’s Try →

Fastly Edge Function with JSON Response

# fastly/demo/json.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response(JSON.stringify({ message: 'Hello, JSON!' }), {
        status: 200,
        headers: { 'Content-Type': 'application/json' }
    })
}

Returns a JSON response from a Fastly Edge function.

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Fastly Edge Function with Query Parameters

# fastly/demo/query.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const url = new URL(request.url);
    const name = url.searchParams.get('name') || 'Guest';
    return new Response(`Hello, ${name}!`, { status: 200 })
}

Reads query parameters and returns a personalized message.

Let’s Try →

Fastly Edge Function with POST Body

# fastly/demo/post.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const data = await request.json().catch(() => ({}));
    return new Response(`Received: ${data.input || ''}`, { status: 200 })
}

Handles POST requests and parses JSON body.

Let’s Try →

Fastly Edge Function with Headers

# fastly/demo/headers.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return new Response('Hello with headers', {
        status: 200,
        headers: { 'X-Custom-Header': 'FastlyEdge' }
    })
}

Returns a response with custom headers.

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Fastly Edge Function Redirect

# fastly/demo/redirect.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    return Response.redirect('https://www.fastly.com', 302)
}

Redirects the request to another URL.

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Fastly Edge Function Error Handling

# fastly/demo/error.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    try {
        throw new Error('Something went wrong')
    } catch(err) {
        return new Response(err.message, { status: 500 })
    }
}

Handles errors and returns a 500 response.

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Fastly Edge Function Delayed Response

# fastly/demo/delay.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    await new Promise(resolve => setTimeout(resolve, 1000))
    return new Response('Delayed Hello!', { status: 200 })
}

Returns a response after a simulated delay.

Let’s Try →

Fastly Edge Function Fetch External API

# fastly/demo/fetch.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const response = await fetch('https://api.github.com')
    const data = await response.json()
    return new Response(JSON.stringify(data), {
        status: 200,
        headers: { 'Content-Type': 'application/json' }
    })
}

Fetches data from an external API and returns it.

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Fastly Edge Function Conditional Response

# fastly/demo/method.js
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    if(request.method === 'POST') {
        return new Response('POST received', { status: 200 })
    } else {
        return new Response('GET received', { status: 200 })
    }
}

Responds differently based on request method.

Let’s Try →

Frequently Asked Questions about Fastly-compute-edge

What is Fastly-compute-edge?

Fastly Compute@Edge is a high-performance, serverless edge computing platform that allows developers to deploy code closer to users, enabling low-latency web experiences and fast content delivery.

What are the primary use cases for Fastly-compute-edge?

What are the strengths of Fastly-compute-edge?

What are the limitations of Fastly-compute-edge?

How can I practice Fastly-compute-edge typing speed?

CodeSpeedTest offers 10+ real Fastly-compute-edge code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.