JSON Validator
100% FreeValidate JSON in real time with structural diagnostics — node count, max depth, type counts, and precise parse-error location.
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- Responsive design
- Lightweight & fast
- No backend required
- Always up-to-date
<iframe
src="https://tools.town/embed/json-validator/"
width="100%"
height="600"
style="border:none; border-radius:12px;"
loading="lazy"
title="JSON Validator">
</iframe>Advertisement
How to Use
- 1 Paste any JSON into the input box
- 2 Valid JSON shows green check + structural stats
- 3 Invalid JSON shows the error with line + column
- 4 On error, the offending snippet is highlighted for inline debugging
Features
- Real-time validation as you type
- Structural stats — total nodes, max depth, type counts
- Parse errors with line + column extracted from the message
- Snippet of the offending position for fast debugging
- Identifies the root type (object, array, primitive)
- 100% client-side
Why it Matters
When an API returns 'unexpected end of JSON input' on a 5MB payload, finding the bad character by hand is painful. This validator pinpoints the exact line and column, surfaces the surrounding snippet, and tells you the structural shape of the rest — no copying into a Node REPL required.
Use Cases
API Response Debug
Find the bad character in a malformed API response
CI Pipeline Check
Validate config files before they hit production
Schema Spot-Check
See node count + depth before designing a schema
Frequently Asked Questions
What's the difference between this and the JSON Formatter?
Does it support JSON5 (single quotes, comments, trailing commas)?
Why is the line/column missing for some errors?
Can I validate against a JSON Schema?
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