API Mock Generator – Mock API Responses

Create mock API response configs for frontend development. Status, headers, body, delay. Runs in your browser.

Status code

Headers (one per line: Name: value)

Body (JSON if Content-Type is application/json)

Delay (ms)

Live preview

200

Headers

Content-Type: application/json

Body

{
  "id": 1,
  "name": "Example",
  "success": true
}

Output format

Explore these related free tools to enhance your productivity and workflow.

JSON Formatter

Format, validate, and minify JSON code with syntax highlighting

CURL to Fetch Converter

Convert curl commands to JavaScript fetch() code

URL Encoder/Decoder

Encode and decode URLs with component and full URL support

Frequently Asked Questions

What is the API Mock Generator?

Define a mock API response: status code, headers, and body (JSON or text). Get a JSON config, Express.js snippet, or fetch example. Use for frontend mocks or local mock servers. 100% browser-based.

When is the body validated as JSON?

Only when Content-Type is application/json. For text/plain, application/xml, or application/x-www-form-urlencoded, the body is treated as plain text.