Free JSON Validator - Validate JSON Online Instantly

Check JSON Syntax & Format - Real-time Validation

JSON Validator

Validate JSON Syntax & Structure - Real-time Error Detection

Result

✓

Validate JSON

Check if your JSON is valid and properly formatted

Try the validator with sample data

What We Check:

Syntax ErrorsMissing quotes, commas

Data TypesObject, Array, String, etc.

StructureBalanced brackets

FormatProper JSON specification

How to Validate JSON - Step by Step Guide

Check JSON syntax, structure, and formatting in real-time with detailed error reports

1

Step 1 - Paste Your JSON Data

Copy your JSON from any source and paste it into the editor. The validator instantly checks syntax, structure, and formatting - detecting issues like missing commas, unmatched brackets, or incorrect quotes.

🔍

Real-time Validation: Instant syntax checking as you type - no waiting for results

📊

Structure Analysis: Detects data type, size, and line count automatically

⚡

Fast Processing: Handles large JSON files instantly - all in your browser

JSON Editor

{
  "user": {
    "id": 12345,
    "name": "John Doe",
    "email": "[email protected]",
    "isActive": true
  },
  "permissions": ["read", "write", "delete"],
  "metadata": {
    "created": "2024-01-15",
    "updated": "2024-01-20"
  }
}

2

Step 2 - View Validation Results

Get instant feedback on your JSON. For valid JSON, see formatted output with statistics. For invalid JSON, receive detailed error messages showing exactly where the problem is - line number, column number, and what went wrong.

✅

Success Indicator: Clear visual feedback with green badge for valid JSON

📍

Precise Error Location: Exact line and column numbers for quick debugging

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Helpful Tips: Common issues checklist helps fix problems faster

Validation→Result

Validation Result

245 bytes12 lines✓ Valid

SIZE

245 bytes

LINES

12

TYPE

object

✓

JSON structure is valid and ready to use

3

Step 3 - Copy or Download Valid JSON

Once validated, export your JSON in the format you need. Copy to clipboard for immediate use, download as a formatted file, or minify for production deployment.

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One-Click Copy: Copy formatted or minified JSON to clipboard instantly

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Download File: Save validated JSON as .json file with proper encoding

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Minify Option: Compress JSON to single line for APIs or storage

⚡One-click export - multiple formats

3 Options

📥

Download JSON - Save validated .json file

📦

Minify JSON - Compress for production

📋

Copy JSON - Copy to clipboard

JSON Validator FAQs

Get answers to common questions about validating JSON syntax and structure

How do I validate JSON online for free?

Simply paste your JSON into the validator editor and get instant results. Our free tool automatically checks syntax in real-time, highlighting errors with exact line and column numbers. No registration required, and all validation happens in your browser with zero data uploads.

What JSON errors can this validator detect and fix?

The validator catches all common JSON errors including missing/extra commas, unmatched brackets, incorrect quotes, trailing commas, invalid escape sequences, and unquoted keys. Each error shows the exact location and a clear explanation, making it easy to fix issues in API responses, config files, or any JSON data.

Is my JSON data safe when using an online validator?

Yes, 100% safe! All validation happens entirely in your browser using client-side JavaScript. Your JSON never leaves your computer or gets uploaded to any server, ensuring complete privacy for sensitive data like API keys, credentials, or personal information.

Can I validate large JSON files without size limits?

Absolutely! Unlike other validators, there are no file size restrictions. Our tool handles JSON files of any size (from small configs to massive API responses) entirely in your browser, so you can validate gigabyte-sized datasets without upload limits or timeouts.

How do I download or copy validated JSON?

Once validated, you have three options: download as a formatted .json file, copy to clipboard with one click, or minify for production use. The tool preserves your data exactly while ensuring proper formatting and removing unnecessary whitespace when minified.

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