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HTTP Request Builder

Free online HTTP request builder. Visually construct API requests and generate ready-to-use curl, fetch, and axios code snippets.

curl -X GET \
  -H 'Authorization: Bearer token123' \
  'https://api.example.com/users'

AI developer workflow fit

Use HTTP Request Builder while building with AI coding assistants, agents, and LLM workflows: validate generated output, transform payloads, debug integrations, and prepare reliable inputs without leaving your browser.

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What Is an HTTP Request Builder?

An HTTP Request Builder is a visual tool that helps developers construct HTTP API requests without writing code from scratch. Instead of manually assembling curl commands or fetch calls, you can select the HTTP method, enter the URL, add headers as key-value pairs, set the request body and content type, and instantly get properly formatted code snippets in multiple formats. This tool generates code for curl (command line), the Fetch API (browser/Node.js), and axios (popular HTTP client library), making it easy to test APIs, share request configurations with teammates, and quickly prototype API integrations.

How to Use the HTTP Request Builder

  1. Select the HTTP method (GET, POST, PUT, PATCH, or DELETE) from the dropdown menu.
  2. Enter the API endpoint URL in the URL input field.
  3. Add request headers by clicking 'Add' and entering key-value pairs. Common headers like Authorization are pre-filled as examples.
  4. For POST, PUT, and PATCH requests, select the Content-Type and enter the request body in the textarea.
  5. Switch between the curl, fetch, and axios tabs to view the generated code in your preferred format.
  6. Click the copy button to copy the generated code to your clipboard.

Common Use Cases

  • API Testing & Debugging — Quickly build HTTP requests to test REST API endpoints. Generate curl commands to run in the terminal or fetch code to paste into the browser console.
  • Documentation & Team Collaboration — Create well-formatted API request examples for documentation, code reviews, or sharing with teammates who use different HTTP clients.
  • Learning HTTP & REST APIs — Understand how HTTP requests are structured by visually building them and seeing the equivalent code in curl, fetch, and axios formats.
  • Rapid Prototyping — Generate boilerplate API call code in fetch or axios format and paste it directly into your application as a starting point for API integration.

FAQ

Does this tool actually send HTTP requests?
No, this tool only generates code snippets. It does not send any requests to the specified URL. You can copy the generated curl command and run it in your terminal, or paste the fetch/axios code into your application to execute it.
What is the difference between fetch and axios?
The Fetch API is built into modern browsers and Node.js 18+, requiring no additional dependencies. Axios is a third-party HTTP client library that provides features like automatic JSON parsing, request/response interceptors, timeout configuration, and broader browser compatibility. Both achieve the same goal of making HTTP requests.
When should I use different Content-Type values?
Use 'application/json' for sending structured JSON data (most common for REST APIs). Use 'application/x-www-form-urlencoded' for HTML form submissions. Use 'text/plain' for sending raw text. The Content-Type header tells the server how to parse the request body.
Can I add custom headers to the request?
Yes, click the 'Add' button to add as many custom headers as needed. Common headers include Authorization (for API keys or tokens), Accept (to specify expected response format), and X-Custom-Header for application-specific headers.

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