When you see this status
- GET request retrieves a resource successfully
- PUT/POST request completes without errors
- HEAD request receives headers for an existing resource
Common causes
- Resource exists and is accessible
- Request payload is valid and processed
- Server completed operation without errors
How to debug it
- Verify request URL and method match endpoint
- Check server logs for errors
- Inspect response headers for metadata
Return this code in your framework
Express (Node.js)
app.get('/data', (req, res) => res.status(200).json({ data: 'value' }));
FastAPI (Python)
@app.get('/data')
async def get_data():
return JSONResponse(content={'data': 'value'}, status_code=200)
NestJS
@Get()
getData(): { data: string } {
return { data: 'value' };
}
Go (net/http)
http.HandleFunc("/data", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprint(w, `{"data":"value"}`)
})
About HTTP 200
HTTP status code 200 OK is part of the
2xx Success family. Request succeeded; response body contains requested data. Understanding it is essential for
backend engineers, API designers, and anyone debugging integrations between services.
The Qaynaq Labs HTTP Status Code Explainer covers all standard codes with practical guidance:
what triggers them, how to debug them in production, and exactly how to return them from common
frameworks. Each code page is hand-curated and verified.