Optimizes API performance through payload reduction, caching strategies, and compression techniques. Use when improving API response times, reducing bandwidth usage, or implementing efficient caching.
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Reduce payload sizes, implement caching, and enable compression for faster APIs.
// Allow clients to select fields: GET /users?fields=id,name,email
app.get('/users', async (req, res) => {
const fields = req.query.fields?.split(',') || null;
const users = await User.find({}, fields?.join(' '));
res.json(users);
});
app.get('/products/:id', async (req, res) => {
const product = await Product.findById(req.params.id);
const etag = crypto.createHash('md5').update(JSON.stringify(product)).digest('hex');
if (req.headers['if-none-match'] === etag) {
return res.status(304).end();
}
res.set({
'Cache-Control': 'public, max-age=3600',
'ETag': etag
});
res.json(product);
});
const compression = require('compression');
app.use(compression({
filter: (req, res) => {
if (req.headers['x-no-compression']) return false;
return compression.filter(req, res);
},
level: 6 // Balance between speed and compression
}));
| Metric | Target |
|---|---|
| Response time | <100ms (from 500ms) |
| Payload size | <50KB (from 500KB) |
| Server CPU | <30% (from 80%) |
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