The latest articles on DEV Community by jsontool (@jsontool). https://dev.to/jsontool https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3800067%2Ff64e917d-1be1-4ae6-b12c-9f05efa53aa7.jpg https://dev.to/jsontool en jsontool Mon, 30 Mar 2026 06:58:48 +0000 https://dev.to/jsontool/how-to-test-rest-apis-online-free-api-tester-guide-4ma2 https://dev.to/jsontool/how-to-test-rest-apis-online-free-api-tester-guide-4ma2 <p>Visit: <a href="https://jsontool.in/blog/api-tester-guide" rel="noopener noreferrer">How to Test REST APIs Online — Free API Tester Guide<br> </a></p> api rest http tutorial jsontool Sun, 01 Mar 2026 15:23:48 +0000 https://dev.to/jsontool/introducing-jsontoolin-a-fast-lightweight-json-validator-for-developers-1476 https://dev.to/jsontool/introducing-jsontoolin-a-fast-lightweight-json-validator-for-developers-1476 <p>If you work with APIs, backend systems, or JavaScript applications, you deal with JSON every single day.<br> And you’ve probably faced this:</p> <ul> <li>Unexpected token error</li> <li>Invalid JSON format</li> <li>Large unreadable API response</li> <li>Trailing comma breaking production</li> </ul> <p>To make JSON debugging easier, I built:</p> <p>👉 <a href="https://jsontool.in/" rel="noopener noreferrer">https://jsontool.in/</a></p> <p>A fast, clean, developer-focused JSON validator and formatter.</p> <p>🔍 Why I Built JsonTool.in<br> Most online JSON tools are:</p> <ul> <li>Slow with large files</li> <li>Filled with ads</li> <li>Cluttered with unnecessary UI</li> <li>Poor at highlighting actual errors</li> </ul> <p>I wanted something:</p> <ul> <li>⚡ Fast</li> <li>🎯 Minimal</li> <li>🧠 Built specifically for developers</li> <li>🚫 No signup required</li> </ul> <p>So JsonTool.in was created.</p> <p>✨ Key Features<br> ✅ Real-Time JSON Validation<br> Paste your JSON and click Validate.<br> It instantly:</p> <ul> <li>Detects syntax errors</li> <li>Highlights exact error positions</li> <li>Prevents runtime crashes</li> <li>No more guessing where the issue is.</li> </ul> <p>🔀 More Than Just a Validator</p> <ul> <li>JsonTool.in also includes:</li> <li>JSON Diff</li> <li>JSON Merge</li> <li>Schema validation</li> <li>JSON statistics (keys, nodes, size)</li> <li>Upload &amp; Export support</li> <li>It’s a complete JSON toolkit.</li> </ul> <p>🧠 Real-World Use Cases<br> Developers use JsonTool.in for:</p> <ul> <li>Debugging REST API responses</li> <li>Validating request payloads</li> <li>Comparing two JSON responses</li> <li>Cleaning large nested JSON objects</li> </ul> <p>If you work with:</p> <ul> <li>Javascript</li> <li>Node.js</li> <li>Python</li> <li>Microservices</li> <li>Backend APIs</li> </ul> <p>This tool can save time daily.</p> <p>⚡ Performance Focused<br> JsonTool.in is worker-powered, which makes it responsive even with larger JSON files.</p> <p>The goal is simple:<br> Fast validation. Clean UI. Zero friction.</p> <p>🚀 Try It Yourself<br> Instead of debugging JSON in the browser console, try:<br> 👉 <a href="https://jsontool.in/" rel="noopener noreferrer">https://jsontool.in/</a><br> Validate. Format. Debug. Done.</p> webdev developer java nocode