🚀 API Tester

Test your REST APIs with ease

About CORS Browser security (CORS) restricts requests to APIs that don't allow cross-origin access. If a request fails despite a valid URL, check the API's CORS policy or use a CORS-enabled endpoint.

No authentication required

Response

                            Click "Send Request" to see the response
                        

                    

                    

                        

                    

                    

                        

                    

                

            

        
    

      
      
API Tester

      
Free online API tester - Test REST APIs with GET, POST, PUT, DELETE, PATCH methods. No registration Postman alternative for developers.

      
developer

      
How people use it

      
This browser-based tool is designed to be fast, easy to use, and private by default. Open the tool, adjust the settings, and get results instantly without creating an account or sending files to a server.

      
Everything runs locally in the browser whenever possible, which reduces friction for users and makes the page more useful as a direct-answer landing page from search.

      
Common topics
The following topics are closely related to this tool and help explain what it is for:
  • api
  • test
  • postman
  • rest
  • http
  • online
  • free
  • request

      
Quick answers
Is this API tester really free with no limits?
Yes, this tool is 100% free to use with unlimited API requests. No hidden costs, trials, or rate limits.
How is this different from Postman?
Our API tester runs entirely in your browser with no installation or registration required. Your data never leaves your device, ensuring complete privacy.
Can I test APIs with authentication headers?
Yes, you can add custom headers including Authorization, API keys, Bearer tokens, and any other HTTP headers.

    


    

      
      
More tools to explore

      
    
        
  • DNS Lookup
    Look up DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA) for any domain instantly. Free online DNS query and diagnostic tool for network administrators.
  • Dilution & Molarity Calculator
    Free online Dilution and Molarity Calculator. Perform M1V1=M2V2 dilution calculations, determine molarity from mass, and calculate percent solutions.
  • Distribution Suite
    One place for Normal, t, F, Chi-square, Poisson — PDF/PMF, CDF, quantiles and sampling with interactive plots. Local-first, easy and free.
  • Simple DOCX Editor
    Open and edit DOCX Word files directly in browser without Microsoft Office. Modify text content, adjust formatting, export edited document.
  • Emoji to Image
    Convert emojis to images (PNG/JPEG/WEBP/SVG). Batch export, transparent background, works fully offline — easy and free online tool.
  • EXIF/GPS Cleaner
    View, analyze and completely remove EXIF metadata, GPS location data from photos. Protects your privacy before sharing images online.
    • 
      

    


    

      
      
API Tester – User Guide

      
Free online API tester - Test REST APIs with GET, POST, PUT, DELETE, PATCH methods. No registration Postman alternative for developers. Debug HTTP requests and responses instantly in your browser.

      

      

        
Overview

        
API Tester is a free online API testing tool that runs in your browser.

        
      

      

        
When to use it

        
Smoke-test an endpoint after deployment (status code, JSON fields, headers).

        
      

      
Read the full guide forAPI Tester