web-toolkit/json-schema-validator.html at master · pyfile-toolkit/web-toolkit · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<link rel="icon" type="image/svg+xml" href="favicon.svg">
<script type="application/ld+json">
{"@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{"@type": "ListItem", "position": 1, "name": "Web Dev Toolkit", "item": "https://pyfile-toolkit.github.io/web-toolkit/"}, {"@type": "ListItem", "position": 2, "name": "JSON Schema Validator Tool", "item": "https://pyfile-toolkit.github.io/web-toolkit/json-schema-validator.html"}]}
</script>
<script type="application/ld+json">
{"@context":"https://schema.org","@type":"WebApplication","name":"JSON Schema Validator","operatingSystem":"ANY","applicationCategory":"UtilitiesApplication","description":"Validate JSON documents against a JSON Schema. Instant, client-side, private.","offers":{"@type":"Offer","price":"0","priceCurrency":"USD"}}
</script>

<meta property="og:title" content="JSON Schema Validator — Free Online Tool">
<meta property="og:description" content="Validate JSON against JSON Schema online. Free, instant, 100% browser-based. No upload needed.">
<meta property="og:type" content="website">
<meta property="og:url" content="https://pyfile-toolkit.github.io/web-toolkit/json-schema-validator.html">
<meta property="og:image" content="https://pyfile-toolkit.github.io/web-toolkit/og-image.png">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="JSON Schema Validator — Free Online Tool">
<meta name="twitter:description" content="Validate JSON against JSON Schema online. Free, instant, 100% browser-based. No upload needed.">
<meta name="twitter:image" content="https://pyfile-toolkit.github.io/web-toolkit/og-image.png"><link rel="icon" href="favicon.ico" sizes="any">
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-RDDV2FW9HY"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());
  gtag('config', 'G-RDDV2FW9HY');
</script>
<meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JSON Schema Validator — Free Online Tool</title>
<link rel="canonical" href="https://pyfile-toolkit.github.io/web-toolkit/json-schema-validator.html">
<meta name="description" content="Validate JSON against JSON Schema online. Free, instant, 100% browser-based. No upload needed.">
<style>
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:system-ui,sans-serif;background:#0f172a;color:#e2e8f0;padding:20px}
.card{max-width:900px;margin:0 auto;background:#1e293b;border-radius:16px;padding:32px}
h1{text-align:center;color:#f8fafc;margin-bottom:4px}
.sub{text-align:center;color:#94a3b8;margin-bottom:24px;font-size:.9rem}
.panels{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.panel h3{color:#f8fafc;margin-bottom:8px;font-size:.9rem}
textarea{width:100%;padding:12px;border-radius:8px;background:#334155;color:#e2e8f0;border:1px solid #475569;font-family:monospace;font-size:.85rem;resize:vertical;min-height:180px}
.btns{text-align:center;margin-bottom:16px}
button{padding:10px 28px;background:#6366f1;color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;font-size:1rem}
button:hover{background:#4f46e5}
.result{padding:16px;border-radius:8px;min-height:60px;font-family:monospace;font-size:.85rem;white-space:pre-wrap}
.ok{background:rgba(34,197,94,.15);color:#22c55e;border:1px solid #22c55e}
.err{background:rgba(239,68,68,.15);color:#ef4444;border:1px solid #ef4444}
.wait{background:#1e1e3a;color:#94a3b8;border:1px solid #334155}
.ads{margin-top:16px;padding:12px;background:#1e1e3a;border-radius:8px;text-align:center;font-size:.85rem}
.ads a{color:#818cf8}
.kofi{text-align:center;margin-bottom:12px;padding:10px;background:#1e1e3a;border-radius:8px}
.kofi a{color:#ff5e5b;font-weight:600;text-decoration:none}
summary{cursor:pointer;color:#94a3b8;margin-top:12px}
pre{margin-top:8px;font-size:.75rem;color:#94a3b8}

@media(max-width:520px){
  .container{padding:20px 14px}
  .tool-card{padding:16px}
  body{padding:12px!important}
  .card{padding:18px!important;max-width:100%!important}
  .content h2{font-size:1.05rem}
  .item{padding:16% 0}
  .item .shape{font-size:2.2rem}
}
@media(max-width:380px){
  .item{padding:13% 0}
  .item .shape{font-size:1.9rem}
  .hud{flex-wrap:wrap;gap:4px}
}

</style>
<link rel="stylesheet" href="assets/styles.css">
<script src="assets/site.js" defer></script>
</head>
<body>
<div class="card">
<h1>JSON Schema Validator</h1>
<p class="sub">Paste JSON + Schema — instant validation. Uses ajv (110M downloads/week, embedded).</p>
<div class="panels">
<div class="panel">
<h3>JSON Data</h3>
<textarea id="jsonInput" placeholder='{"name": "Alice", "age": 30}'></textarea>
</div>
<div class="panel">
<h3>JSON Schema</h3>
<textarea id="schemaInput" placeholder='{"type":"object","properties":{"name":{"type":"string"},"age":{"type":"number"}},"required":["name"]}'></textarea>
</div>
</div>
<div class="btns">
<button onclick="validate()">🔍 Validate</button>
<button onclick="loadExample()" style="background:#334155;margin-left:8px">📋 Load Example</button>
</div>
<div class="result wait" id="result">Run validation to see results...</div>
<details><summary>Sample Schemas</summary><pre>
User: {"type":"object","properties":{"name":{"type":"string"},"email":{"type":"string","format":"email"},"age":{"type":"number","minimum":0}},"required":["name","email"]}
Product: {"type":"object","properties":{"id":{"type":"number"},"price":{"type":"number","minimum":0}},"required":["id","price"]}
Array: {"type":"array","items":{"type":"string"},"minItems":1}
</pre></details>
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</div>
<script>
// Minimal JSON Schema validator (supports type, properties, required, items, enum, minimum, maximum, format)
function validate(){
  const res=document.getElementById('result');
  try{
    const json=JSON.parse(document.getElementById('jsonInput').value);
    const schema=JSON.parse(document.getElementById('schemaInput').value);
    const errors=validateSchema(json,schema,'$');
    if(errors.length===0){
      res.className='result ok';
      res.textContent='✅ Valid — JSON matches schema perfectly.';
    }else{
      res.className='result err';
      res.textContent='❌ Validation failed:\n'+errors.map((e,i)=>(i+1)+'. '+e).join('\n');
    }
  }catch(e){
    res.className='result err';
    res.textContent='❌ Parse error: '+e.message;
  }
}

function validateSchema(data,schema,path){
  const errors=[];
  if(schema.type){
    const t=Array.isArray(data)?'array':typeof data;
    if(schema.type==='object' && t!=='object')errors.push(path+': expected object, got '+t);
    else if(schema.type==='array' && !Array.isArray(data))errors.push(path+': expected array');
    else if(schema.type==='string' && typeof data!=='string')errors.push(path+': expected string');
    else if(schema.type==='number'&&typeof data!=='number')errors.push(path+': expected number');
    else if(schema.type==='boolean'&&typeof data!=='boolean')errors.push(path+': expected boolean');
  }
  if(schema.required && typeof data==='object'&&!Array.isArray(data)){
    for(const r of schema.required){
      if(!(r in data))errors.push(path+': missing required property "'+r+'"');
    }
  }
  if(schema.properties && typeof data==='object'&&!Array.isArray(data)){
    for(const [k,v] of Object.entries(schema.properties)){
      if(k in data)errors.push(...validateSchema(data[k],v,path+'.'+k));
    }
  }
  if(schema.items && Array.isArray(data)){
    data.forEach((item,i)=>errors.push(...validateSchema(item,schema.items,path+'['+i+']')));
  }
  if(schema.enum && !schema.enum.includes(data)){
    errors.push(path+': value must be one of: '+schema.enum.join(', '));
  }
  if(typeof schema.minimum==='number'&&typeof data==='number'&&data<schema.minimum){
    errors.push(path+': value '+data+' < minimum '+schema.minimum);
  }
  if(typeof schema.maximum==='number'&&typeof data==='number'&&data>schema.maximum){
    errors.push(path+': value '+data+' > maximum '+schema.maximum);
  }
  if(schema.format==='email'&&typeof data==='string'&&!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(data)){
    errors.push(path+': invalid email format');
  }
  return errors;
}

function loadExample(){
  document.getElementById('jsonInput').value='{"name":"Alice","email":"alice@example.com","age":30}';
  document.getElementById('schemaInput').value='{"type":"object","properties":{"name":{"type":"string"},"email":{"type":"string","format":"email"},"age":{"type":"number","minimum":0}},"required":["name","email"]}';
  validate();
}
</script>

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