JSONView

JSON Linter Online

Analyze JSON for syntax errors and structural issues in real time

Live linting enabled

* Syntax errors are highlighted with red squiggles. Hover over them to see the exact error message.

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About This Tool

A JSON linter is a specialized tool that analyzes your JSON data for common structural issues, missing quotes, duplicate keys, and formatting errors. Unlike a standard validator that merely tells you if the JSON is valid or not, our free online JSON Linter acts like an IDE — it highlights syntax errors directly on the corresponding lines with red squiggles and provides a hover tooltip showing the exact error message. This makes it incredibly easy to scan through large JSON payloads and spot exactly where a trailing comma or a mismatched bracket is breaking your data. Simply paste your JSON, and the linter will instantly analyze it in real time as you edit. Works entirely in your browser — your data never leaves your device.

How to Use

  1. Paste your JSON into the CodeMirror editor below
  2. If there are any errors, red squiggles will appear under the invalid syntax
  3. Hover your mouse over the red squiggles to read the exact error message

Frequently Asked Questions

What is a JSON linter?
A JSON linter is a tool that analyzes JSON data to detect errors, bugs, or suspicious constructs. It goes beyond basic validation by visually highlighting exact error locations inline.
How does the linter highlight errors?
It uses visual cues like red squiggly lines under the problematic syntax. You can hover over these lines to see tooltips explaining what is wrong.
Is JSONView's JSON linter free?
Yes, completely free. No signup, no limitations.
Does my JSON data get sent to a server?
No. All linting happens right in your browser. Your data is secure and never leaves your device.
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