JSON Validator
Validate JSON syntax and pinpoint errors instantly.
Processed locally in your browser. Nothing you enter is uploaded or stored.
Overview
Checks whether a JSON document is syntactically valid and, if not, tells you exactly which line and character to fix.
How to use it
- 1Paste your JSON into the editor.
- 2Validation runs automatically as you type.
- 3If invalid, the exact error position is highlighted with a description.
How it works
Uses the native JSON.parse engine and surfaces its error message alongside the line/column it points to, so you don't have to hunt through the raw error string.
Tips
- A single missing comma or extra closing brace is the most common cause of invalid JSON — check the line right before the reported error too.