JSON Validator & Syntax Checker

Check whether your JSON is valid, see parser feedback, and pretty-print clean output in one place.

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Interactive Tool

JSON Input

Validation Status

Invalid JSON

Formatted JSON

Valid JSON is pretty-printed here after syntax validation.

Paste JSON to validate and format it.

This tool validates JSON syntax only. It does not validate against a JSON Schema.

Intro

This JSON validator is built for the moments when formatting alone is not enough and you need to know exactly whether the payload is valid.

Paste API responses, config files, or test fixtures to verify syntax, surface parsing errors, and copy a readable formatted version when the input is correct.

How to use

Paste raw JSON
Insert the JSON payload you want to validate into the editor.
Review validation status
The tool checks syntax locally in your browser and shows whether the payload is valid.
Copy formatted output
If the JSON is valid, copy the pretty-printed output for debugging, documentation, or development work.

Examples

Validate a valid object

A compact payload becomes readable formatted JSON.

Input

{"name":"Alex","roles":["admin","editor"],"active":true}

Output

Status: Valid JSON
{
  "name": "Alex",
  "roles": [
    "admin",
    "editor"
  ],
  "active": true
}

Catch a syntax error

Missing quotes or commas should fail validation immediately.

Input

{name: "Alex" "active": true}

Output

Status: Invalid JSON
Unexpected token n in JSON at position ...

Spot a trailing comma

Trailing commas are valid in some JavaScript contexts, but not in strict JSON.

Input

{"name":"Alex","roles":["admin",],"active":true}

Output

Status: Invalid JSON
Unexpected token ] in JSON at position ...

FAQ

What is the difference between a JSON validator and a JSON formatter?

A formatter focuses on presentation, while a validator focuses on whether the JSON is syntactically correct and where parsing fails.

Does this tool validate JSON Schema rules?

No. This tool validates JSON syntax only. If you need to generate or work with schema rules, use the JSON Schema Generator separately.

Does this tool send my JSON to a server?

No. Validation happens locally in your browser, which is especially useful when you need to inspect sensitive API payloads or configuration data.

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