Validate JSON and show readable errors.
Workbench
Runs in your browserJSON Validator
Output
Example input
{"project":"Structora","active":true}Example output
Valid JSON
What this tool does
JSON Validator parses JSON locally, reports syntax failures, and identifies the root data type and byte size when valid.
Capabilities
- Strict JSON parsing
- Readable syntax errors
- Root-type detection
- Input-size reporting
Known limitations
- Validation checks JSON syntax, not a JSON Schema
- Comments and trailing commas are invalid JSON
Use cases
- Confirm an API payload or configuration file is valid before use.
- Check API payloads
- Validate configuration
- Diagnose copied response bodies
Technical reference: JSON standard (RFC 8259)
FAQ
Does it validate against JSON Schema?
No. This version validates JSON syntax and structure only.
Why are comments rejected?
The JSON standard does not permit comments.
What is JSON Validator?
Validate JSON and show readable errors.
Does this tool upload my input?
No. The transformation runs locally in your browser.
Go further
Guides
Beginner Guide
Supporting content for json yaml workflows.
Advanced Guide
Supporting content for json yaml workflows.
Workflow Guide
Supporting content for json yaml workflows.
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