JSON syntax diagnostics workspace
JSON Validator
Find JSON syntax problems quickly with precise, clickable diagnostics.
Runs locally in your browser · data is not uploaded
•
Ready for JSON
Paste JSON, drop a .json file, or try a sample.
Large file mode · live validation waits until typing stops
InputJSON source
0 lines0 B
InspectValidated preview
Input changed · run again to refresh output
Validate JSON to explore it as a tree.
Ready
Diagnostics
Ready
JSON diagnostics
Developer workbenchQuery, transform, convert, validate, export
JSONPath querySupports property, index, wildcard, negative index, and recursive selectors.
Run a JSONPath query against the current input.
Transform JSONPreview changes first, then replace the editor only when you choose Apply.
JSON ↔ YAML / XML / CSVConversions stay in the browser. YAML import targets common data-oriented YAML.
Ready.
JSON SchemaValidate common Draft 2020-12 keywords or infer a schema from the current document.
Paste a schema or infer one from your JSON.
Utilities & exportEncode, escape, unwrap nested JSON, or export exactly what you need.
Choose an action.
Developer snippetsGenerate ready-to-paste parsing examples from the current JSON.
Data insightsStructure and performance metrics are calculated locally.
Validate JSON to populate insights.
Esc
Use JSON Validator without a complicated workflow.
Validate JSON entirely in your browser. See whether the document is valid, identify syntax failures with line, column, context, and a caret marker, flag duplicate object keys that normal JSON parsing silently overwrites, and inspect root type, depth, containers, primitive values, lines, characters, and UTF-8 byte size.
How to use
01Paste JSON or load a .json file
02Validate syntax and inspect exact line/column diagnostics or duplicate-key warnings
03Review root type, depth, containers, primitives, characters, and bytes
Workspace highlights
✓Exact syntax line, column, offset, context, and caret
✓Duplicate object-key warnings with locations
✓Root type and structural statistics
✓Formatted preview, copy, download, samples, and keyboard shortcuts