HTTP Request Builder

Build API requests in the browser. Cross-origin policies still depend on the target server.

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About HTTP Request Builder


This HTTP request builder lets you compose and send basic API requests from the browser, subject to the target server's CORS rules.



HTTP Request Syntax


// Fetch API syntax
fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer token'
  },
  body: JSON.stringify({ name: 'value' })
})

// Common headers
Content-Type: application/json
Authorization: Bearer <token>
Accept: application/json
X-API-Key: your-api-key




HTTP Methods



  

    Method
    Purpose
    Body
  

  

    GET
    Retrieve resources
    No
  

  

    POST
    Create resources
    Yes
  

  

    PUT
    Replace resources
    Yes
  

  

    PATCH
    Partial update
    Yes
  

  

    DELETE
    Remove resources
    No
  









Frequently Asked Questions



  
What HTTP methods are supported?

  
This tool supports GET, POST, PUT, PATCH, and DELETE methods. GET retrieves data, POST creates new resources, PUT replaces resources, PATCH partially updates resources, and DELETE removes resources. Each method serves different REST API operations.


  
How do I add custom headers to requests?

  
Add headers in the format 'Header-Name: value' on separate lines. Common headers include: Content-Type: application/json, Authorization: Bearer token, Accept: application/json. Multiple headers are parsed line-by-line and included in the fetch request.


  
Why am I getting CORS errors?

  
CORS (Cross-Origin Resource Sharing) errors occur when the target server doesn't allow requests from your origin. Browsers enforce CORS policies for security. Solutions: use a server-side proxy, configure the API server to allow your origin, or use browser extensions for development testing.


  
What is the difference between PUT and PATCH?

  
PUT replaces the entire resource with the provided data (all fields required). PATCH applies partial updates (only changed fields needed). Example: PUT /users/1 requires full user object; PATCH /users/1 can update just {"name": "new"}.