Agent skill

api-response-optimization

Optimizes API performance through payload reduction, caching strategies, and compression techniques. Use when improving API response times, reducing bandwidth usage, or implementing efficient caching.

View SKILL.md on GitHub Repository
Stars 109
Forks 14

Install this agent skill to your Project

npx add-skill https://github.com/secondsky/claude-skills/tree/main/plugins/api-response-optimization/skills/api-response-optimization

SKILL.md

API Response Optimization

Reduce payload sizes, implement caching, and enable compression for faster APIs.

Sparse Fieldsets

javascript
// 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);
});

HTTP Caching Headers

javascript
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);
});

Response Compression

javascript
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
}));

Performance Targets

Metric Target
Response time <100ms (from 500ms)
Payload size <50KB (from 500KB)
Server CPU <30% (from 80%)

Optimization Checklist

  • Remove sensitive/unnecessary fields from responses
  • Implement sparse fieldsets
  • Add ETag/Last-Modified headers
  • Enable gzip/brotli compression
  • Use pagination for collections
  • Eager load to prevent N+1 queries
  • Monitor with APM tools

Best Practices

  • Cache immutable resources aggressively
  • Use short TTL for frequently changing data
  • Invalidate cache on writes
  • Compress responses >1KB
  • Profile before optimizing

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