Is this JSON validator secure?

Yes. All validation runs locally in your browser. Your JSON data is not uploaded or stored.

JSON Validator

Q: How do I validate JSON?

Paste your JSON into the validator and click Validate JSON. The tool checks syntax, formatting, and structure instantly.

Q: What makes JSON invalid?

Common issues include missing commas, unmatched brackets, incorrect quotes, trailing commas, and improper key-value formatting.

Q: Can I fix JSON errors online?

Yes. After validation identifies the issue, you can correct the syntax directly in the editor and revalidate until the JSON is valid.

Paste your JSON below to validate its syntax and structure. Validation runs entirely in your browser.

Validate JSON Online Instantly

JSON (JavaScript Object Notation) is widely used for APIs, configuration files, ecommerce data, analytics exports, and application integrations. Even a small formatting mistake can break an API request or cause application errors.

This JSON Validator checks your input for proper syntax and structure compliance. It detects formatting errors such as missing commas, incorrect quotation marks, unmatched brackets, invalid nesting, and malformed key-value pairs.

How to Validate JSON

Step 1: Paste Your JSON

Copy your JSON from an API response, configuration file, or export and paste it into the editor above.

Step 2: Click “Validate JSON”

The tool parses the data and confirms whether it is valid JSON. If errors exist, they are identified immediately.

Step 3: Fix and Revalidate

Correct any syntax issues and run validation again until the JSON passes successfully.

Common JSON Errors Explained

Missing Commas or Brackets

One of the most frequent JSON errors is forgetting a comma between properties or leaving a bracket unclosed. These small mistakes prevent the entire structure from parsing.

Incorrect Use of Quotes

JSON requires double quotes for keys and string values. Single quotes are not valid under strict JSON standards.

Trailing Commas

Unlike some programming languages, JSON does not allow trailing commas at the end of objects or arrays.

For a deeper breakdown of syntax problems, see our guide to common JSON errors and fixes.

Why JSON Validation Matters

Invalid JSON can cause API failures, data import errors, broken web apps, and failed automation scripts. If you work with ecommerce feeds, payment systems, or analytics exports, validation should be part of your workflow.

If you need help understanding the format itself, read our complete guide explaining what JSON is.

Related JSON Tools

After validating, you may want to format or convert your data. Try our JSON formatter and prettifier to clean up messy JSON, or convert formats using our JSON to XML converter.

FAQ: JSON Validator

How do I validate JSON?

Paste your JSON into the tool above and click “Validate JSON.” The validator checks the syntax instantly and confirms whether it is valid.

What makes JSON invalid?

Invalid JSON typically contains missing commas, unmatched braces, improper quotation marks, trailing commas, or incorrect nesting.

Can I fix JSON errors online?

Yes. Edit the JSON directly in the input box and revalidate until the structure passes.

Does this tool validate JSON schema?

This tool validates JSON syntax and structure. It does not validate against a custom JSON schema definition.

Is this JSON validator safe?

Yes. All validation runs locally in your browser. No data is uploaded or stored.