Developer
JSON validator
Check whether JSON is valid and find the exact line of any error.
Free to use · Runs in your browser · No signup
This tool works in your browser. Enable JavaScript to select files and create your download.
How to use JSON validator
- Paste the JSON you want to check.
- Read the result: valid, or the error message with its line and column.
- Fix the reported problem, such as a trailing comma or missing quote, and check again.
What you need
Nothing to upload. Type or paste directly into the tool; results update as you go.
Your result
A valid or invalid result with the error location.
Before you start
This checks JSON syntax, not a schema. Comments and trailing commas are not allowed in standard JSON.
Questions about JSON validator
How do I use JSON validator?
Paste the JSON you want to check. Read the result: valid, or the error message with its line and column. Fix the reported problem, such as a trailing comma or missing quote, and check again.
What does JSON validator produce?
A valid or invalid result with the error location.
What should I check before using JSON validator?
This checks JSON syntax, not a schema. Comments and trailing commas are not allowed in standard JSON.
Is what I type sent anywhere?
No. The calculation runs in your browser, and the text or numbers you enter are not uploaded or stored.