JSON Validator — Find Errors Fast
A dedicated validator that focuses on one job: telling you whether your JSON is valid, and if not, exactly where the problem is. Ideal for triaging API responses and config files.
indent:
Input0 chars · 0 lines
Output
Result will appear here.// Features
- ▸Instant valid/invalid verdict
- ▸Line and column error markers
- ▸Trailing character detection
- ▸Zero network round-trips
// How to use
- 01Paste your JSON into the input pane.
- 02Read the verdict banner at the top of the output.
- 03If invalid, jump to the reported line/column and fix.
// FAQ
Your data never leaves your browser. This tool runs 100% locally — no upload, no logging, no analytics on your inputs.
// Related tools
JSON Formatter
Pretty-print and validate JSON with adjustable indentation. Runs entirely in your browser — nothing is uploaded.
JSON Minifier
Strip whitespace from JSON and see the exact byte savings. Runs in your browser.
JSON Viewer
Browse JSON as a collapsible tree with syntax highlighting. Local-only.