How to use: JSON Validator
JSON Validator is a free online JSON Tools tool that check JSON syntax and pinpoint the exact error position instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
Description
Check JSON syntax and pinpoint the exact error position.
- JSON Tools
- Because everything is computed client-side, JSON Validator is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using JSON Validator takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Run
Examples
Valid JSON passes. Try {"broken": [1,2,} or {a:1} to see the exact error position.
Input
{"name":"26173","tools":["base64","uuid"],"count":256,"nested":{"ok":true}}
Output
✅ Valid JSON.
This output was produced by actually running the tool, not written by hand.
Use cases
Common situations where JSON Validator helps:
- Check JSON syntax and pinpoint the exact error position.
Parameters
This tool has no options — it works on the input alone.
FAQ
What is JSON Validator?
JSON Validator check JSON syntax and pinpoint the exact error position. It runs entirely in your browser, so your data stays private.
Is JSON Validator free to use?
Yes. JSON Validator is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.
Good to know
- Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.