high severity

How to Fix: Next.js API Route Not Working

Your Next.js API route returns 404 or doesn't handle requests correctly.

next api route not workingapi route 404route handler errornext api routes app router

Symptoms

API route returns 404

POST request body is undefined

Wrong HTTP method handled

Common Causes

01

File not in correct location

02

Missing/wrong HTTP method export

03

Body not being parsed correctly

04

Conflicting route with page

The DevConsole Solution

DevConsole's API Lab can test your routes directly and show exactly what the server receives.

Step-by-Step Fix

1

Verify Route Path

Ensure file is at /app/api/[route]/route.ts

2

Check Exports

Export named functions: GET, POST, PUT, DELETE

3

Test with DevConsole

Use API Lab to send test requests and see responses.

Get DevConsoleDocumentation

Frequently Asked Questions

How do I get the request body in App Router?

Use request.json() for JSON or request.formData() for form data.

Can I use middleware with API routes?

Yes, middleware.ts runs before API routes. Check if it's interfering.

Helpful Tools

JSON Formatter

Free JSON formatter and beautifier. Format, validate, and minify JSON data.

HTTP Header Analyzer

Free HTTP header analyzer. Analyze and understand HTTP headers.

Related Problems

CORS Error on Localhost

Your browser blocks requests from localhost to your API because of Cross-Origin Resource Sharing (CORS) policy restrictions.

500 Internal Server Error

The server encountered an unexpected error and couldn't process your request.

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