This JSON syntax checker parses your document and reports the first blocking error—missing brackets, bad escapes, or wrong types. Use it when linters are unavailable or you need a quick browser check.

Errors report the first failure; fix iteratively until the document parses cleanly.

How to use this tool

Paste invalid JSON, read the error message, jump to the line indicated, and revalidate.

Worked example

Example: `{name: "test"}` fails—keys must be quoted as `"name"` in valid JSON.

When to use this

Quick checks on copied API responses.
Validating LLM-generated JSON.
Teaching students common JSON mistakes.

Common mistakes

Smart quotes from Word docs.
BOM characters at file start.
Mixing JSON with JavaScript object syntax.

json unexpected token
escape quotes in json
validate json schema

How it works

Paste JSON to validate syntax instantly. Invalid JSON shows parse errors with line and column when available. Validation works on your device.

Limitations

Validates JSON syntax only. Schema, business rules, and duplicate keys are not checked unless noted.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related JSON Validator guides

These pages use the same json validator with guides tailored to specific search intents.

JSON Validator — general payment estimate
Validate JSON Online
Validate JSON Syntax
JSON Lint Checker
Check JSON Online

FAQ

Frequently asked questions

Schema validation?

This checks syntax only—not JSON Schema or required fields.

Is data sent to a server?

Validation works on your device on Utilnivo.

Array vs object root?

Both are valid if syntax is correct; root must be one JSON value.

Page last reviewed: July 5, 2026

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