M
API Matrix

JSON 2 JSONP API

Development / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
82 Score
Grade A
Visit Official Site Compare Alternatives

Overview

JSON 2 JSONP is a free, no-auth service that acts as a JSONP proxy, converting any JSON endpoint into a JSONP response on the fly to bypass browser cross-domain restrictions in legacy applications. It is particularly useful when working with older JavaScript environments that cannot use CORS. Simply pass your target JSON URL and a callback name to get a JSONP-wrapped response.

💡

Beginner Tip

JSONP is a legacy technique mostly used for older browsers or environments without CORS support. If you are building a modern application, use a server-side proxy or an API that supports CORS instead, as JSONP has security limitations.

Available Data

JSON 2 JSONP data via REST API
JSON-formatted response data
Freely accessible without authentication

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from JSON 2 JSONP",
    "description": "Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

(JSONP response) The response is a JavaScript function call like myFunction({...}) wrapping the original JSON data from the target URL

Implementation Example 

const url = "https://json2jsonp.com/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Callback function not called The callback parameter name in the URL does not match the function defined in your JavaScript
✓ Ensure the callback= value in your request URL exactly matches the JavaScript function name you want invoked
Target URL returns an error The JSON source URL is unreachable or returns non-JSON content
✓ Verify the source URL returns valid JSON by opening it directly in a browser before using it as the url parameter
Security warning in modern browsers JSONP injects and executes arbitrary script, which triggers security warnings in some environments
✓ Consider migrating to a CORS-enabled API or server-side proxy; JSONP should be avoided in production modern applications

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 15/20
🔒 Security 15/15
🛠 Developer XP 15/20
✓ Reliability 7/15
Response Time 332ms

Fully tested on Apr 5, 2026

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Development
Difficulty Beginner
Verified: 2026-04-04

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