JSON parse error appears before schema validation
The payload must be valid JSON before required fields or types can be checked.
Remove comments and trailing commas, quote keys properly, then run validation again.
Use this tool
Prepare the input and run the tool
Paste the JSON payload and JSON Schema. Result: Review validation errors or copy the success result.
Paste JSON and a schema, or load the Ana example.
Validation report appears after you run the validator.
Data handling: Files and pasted data are processed in this browser session.
Tool guide
How to use JSON Schema Validator
Use this before sending JSON to an API or automation step. The report shows what field failed and why.
What this tool does
Paste JSON and a schema to check required fields, types, and validation errors.
- Input
- Paste the JSON payload and JSON Schema
- Output
- Review validation errors or copy the success result
Tool advantages
- Runs in this page; the file or pasted data is not sent to a new app.
- Keeps the preview, report, and download in the same screen.
- Gives you a report you can use as a cleanup list.
Step-by-step usage guide
- 1Paste the JSON payload.
- 2Paste or edit the schema.
- 3Run validation and review any errors.
Common errors and fixes
Required field errors use the wrong path
Nested objects and arrays can make field paths look different from labels in an app UI.
Trace the reported path in the JSON tree and update the nested field rather than adding a duplicate top-level value.
A value has the wrong type
APIs often reject numbers sent as strings, booleans sent as text, or arrays sent as comma-separated strings.
Change the value type in the JSON payload and keep the schema as the source of truth for the handoff.
When to use JSON Schema Validator
- You are checking files before an upload, import, share, or delivery.
- You want to confirm the result before sending it to another system.
- You need a copied result, downloaded file, or report that can be reviewed outside the page.
FAQ
Which schema rules are supported?
The validator supports common type, required, properties, and pattern checks for API payload preflight.
Should I paste secrets here?
Use non-sensitive test payloads when checking API shapes.