JSON Validator — Check & Fix JSON Online
Validate JSON syntax with precise line and column errors, human-friendly explanations, and one-click repair — all in your browser. No uploads, no signup.
Your data never leaves your browser
About this tool
ValidateLine:column errorsAuto-repairJSON SchemaPrivacy-first
How to use
- Paste or upload your JSON into the editor.
- See instant validity — green for valid, red with line:column for invalid.
- Read the error explanation and likely fix in the detail card.
- Click Jump to error to scroll to the problem line.
- Apply repair suggestions or use Fix & Format to auto-repair common issues.
Examples
Valid JSON
{"status":"ok","count":42}✓ Valid JSON — 2 nodes, depth 1
Trailing comma → error
{"items":[1,2,3,]}✕ Invalid — line 1, column 18 · Trailing comma before ]