pine trail
I have a ssr page where I fetch data from a json endpoint (within my astro project), and then display the results. I used performance.now() and notice the fetch is slow.
So I need to use performance.now inside my endpoint. Can you show me how to do that?
pulsar jayBOT
Hi @pine trail. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
To debug the performance of your SSR endpoint in Astro, you can indeed use performance.now() inside your endpoint. Here's how you can implement this:
export const prerender = false; // Ensure SSR mode
export async function GET({ params, request }) {
const start = performance.now();
// Your existing fetch logic here
const response = await fetch('your-data-url');
const data = await response.json();
const end = performance.now();
const duration = end - start;
console.log(`Endpoint execution time: ${duration}ms`);
return new Response(JSON.stringify({
data,
executionTime: duration
}), {
status: 200,
headers: {
"Content-Type": "application/json"
}
});
}
This code snippet demonstrates how to measure the execution time of your endpoint. Here's what it does:
performance.now() to get the start and end times of the endpoint execution.Remember that this code should be placed in your endpoint file (e.g., src/pages/api/your-endpoint.js).
To use this in your SSR page, you would fetch from this endpoint and can then access both the data and the execution time.
Note that performance.now() is available in Node.js environments, which Astro uses for SSR. However, the precision might vary depending on the system.
pine trail
@pulsar jay My old return statement was this:
return new Response(
JSON.stringify(allCars),
{
status: 200,
headers: { "content-type": "application/json" },
}
);
I updated it to:
return new Response(
JSON.stringify({
performance: performanceResults,
allCars,
}),
{
status: 200,
headers: { "content-type": "application/json" },
}
);
But now my map functions don't work anymore:
const makes = [...new Set(allCars.map((car: Car) => car.data.general.make))].sort();
const colors = [...new Set(allCars.map((car: Car) => car.data.exterior.color))].sort();
How should I update those?
pulsar jayBOT
Let me check the knowledge base for you again. One moment! :books:
Based on the changes you've made to your endpoint's return statement, it appears that you've modified the structure of the response. Instead of directly returning allCars, you're now returning an object that contains both performanceResults and allCars. This change affects how you need to access the allCars data on the client side.
To fix your map functions, you need to update them to access allCars from the new response structure. Here's how you can modify your code:
const response = await fetch('your-endpoint-url');
const data = await response.json();
const allCars = data.allCars; // Extract allCars from the response
const makes = [...new Set(allCars.map((car: Car) => car.data.general.make))].sort();
const colors = [...new Set(allCars.map((car: Car) => car.data.exterior.color))].sort();
In this updated code:
allCars array from the data object.allCars array in our map functions, which should now work as before.This approach allows you to keep your performance measurements while maintaining the functionality of your map operations.
Remember, when you modify the structure of your API responses, you need to update all the places in your code that consume this data to reflect the new structure.
pine trail
@pulsar jay update this code:
const response = await fetch(APIURL);
const allCars: Car[] = response.status === 404 ? [] : await response.json();
const makes = [...new Set(allCars.map((car: Car) => car.data.general.make))].sort();
const colors = [...new Set(allCars.map((car: Car) => car.data.exterior.color))].sort();
const count = allCars.length > 0 ? allCars.length : 0;
pulsar jayBOT
Let me check the knowledge base for you again. One moment! :books:
Based on the changes you've made to your endpoint's response structure, I can help you update your code to correctly handle the new format. Here's the updated version:
const response = await fetch(APIURL);
const responseData = response.status === 404 ? { allCars: [] } : await response.json();
const allCars: Car[] = responseData.allCars;
const makes = [...new Set(allCars.map((car: Car) => car.data.general.make))].sort();
const colors = [...new Set(allCars.map((car: Car) => car.data.exterior.color))].sort();
const count = allCars.length;
Here's what changed:
responseData, which contains the allCars array.allCars from responseData.allCars array.This update assumes that your endpoint now returns an object with an allCars property, as you showed in your previous question. If you also want to access the performance data, you can do so from responseData.performance.