API Testing Like a Pro with CodeAgento's Backend Tools

CodeAgento Team2026-05-198 min read

Stop switching between Postman, your terminal, and your IDE. CodeAgento puts all your API testing tools in one place.

The API Tester

Our built-in API tester supports:

**All HTTP methods**: GET, POST, PUT, PATCH, DELETE

**Headers**: Custom headers with common presets

**Body**: JSON, form data, and raw text

**Auth**: Bearer tokens, API keys, and basic auth

**Response**: Formatted JSON/XML, headers, timing, and status codes

Press **Cmd+Enter** to send a request

Use the Send-To menu to pipe responses to the JSON Formatter

Save frequently-used requests for later

For GraphQL APIs, switch to the GraphQL Playground:

Schema explorer with auto-complete

Query and mutation support

Variables panel

Response with execution time

For real-time APIs:

Connect to any WebSocket server

Send and receive messages

Monitor connection state

View message history with timestamps

Need to develop against an API that doesn't exist yet?

Create custom endpoints with any HTTP method

Define response bodies, status codes, and headers

Share mock URLs with your frontend team

Debug incoming webhooks:

Get a unique URL to receive webhooks

Inspect payloads, headers, and timing

Replay webhooks for testing

Forward to your local server

Before you ship:

Configure concurrent requests and duration

Test against any endpoint

View response time distribution

Identify bottlenecks