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JSON Validator

JSON & Data Format · Free Online Tool

Validate JSON syntax and highlight error positions.

By CoderNewbie Team
Success
90 chars
102 chars
{
  "name": "Alice",
  "age": 30,
  "skills": [
    "JavaScript",
    "Python"
  ],
  "active": true
}

Live Check

Validates on every keystroke — instant feedback.

Pinpoint Errors

Highlights the exact line and column of syntax issues.

Pretty Preview

Valid input is reformatted so you can confirm structure at a glance.

How to Use JSON Validator

  1. 1Paste your input data (JSON, CSV, XML, YAML, etc.) into the input field.
  2. 2The tool automatically processes and validates your data.
  3. 3Review the converted output in the result panel.
  4. 4Copy or download the converted result.

Features

  • ✓100% free — no signup, no subscription, no ads
  • ✓Runs entirely in your browser — data never leaves your device
  • ✓Fast and lightweight — instant results
  • ✓Cross-platform — works on desktop, tablet, and mobile

Frequently Asked Questions

Can I convert large JSON files?

Yes, but performance depends on your browser. Files up to 10MB are generally handled well.

Do you validate the input?

Yes, most tools validate input and show error messages with line numbers for invalid data.

Can I download the converted result?

Yes, most conversion tools provide a download button for the output file.

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JSON to YAML

Convert JSON to YAML format.

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Learn the concept

Learn the concept

Understand the programming ideas behind this tool.

View lessons