How do I check if my JSON is valid?

Paste your JSON into the Utilx JSON Validator and click Validate. The tool checks your JSON against the JSON specification and tells you immediately whether it is valid. If there is an error, it shows you the exact location and nature of the problem.

Is my JSON data sent to a server when I validate it?

No. The validator runs entirely in your browser using JavaScript. Your JSON is never uploaded, transmitted, or stored anywhere. It stays on your device the whole time, which makes it safe to use with sensitive config files or internal API responses.

What kinds of JSON errors can this tool detect?

The validator catches all standard JSON syntax errors: trailing commas, missing or extra brackets and braces, unquoted keys, improperly escaped characters, mismatched quotes, and invalid data types. It tells you the line and position of each error rather than just saying the JSON is broken.

Can I validate JSON online without installing anything?

Yes. The Utilx JSON Validator requires no installation, no browser extension, and no account. It works in any modern browser — Chrome, Firefox, Safari, or Edge. Open the page, paste your JSON, and validate it immediately.

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

A JSON validator checks whether your JSON follows the correct syntax — it gives you a pass or fail with error details. A JSON formatter takes valid JSON and makes it easier to read by adding indentation and line breaks. The two tools work well together: validate first to confirm correctness, then format to improve readability.

⚡ Speed Up Workflow⚡ Workflow

JSON Validator — Instantly Check If Your JSON Is Valid

Paste JSON below

Exact Error Location

Errors come with a line number and character position — not just 'invalid JSON'.

Instant Results

Validation happens as soon as you click — no loading spinner, no delay.

100% Browser-Based

No server-side processing. Your JSON stays on your device.

Free with No Account

No signup, no usage caps, no rate limits. Open the page and validate.

Next Steps

Minify for Production Convert to CSV

Quick Answer

Paste your JSON from any source — editor, terminal, API response, or config file
Validate instantly to get a clear pass or fail result, no guessing
Pinpoint errors with specific messages showing the exact line and character
Fix and re-check in the same window until your JSON comes back clean
Stay private — validation runs in your browser; no data is sent anywhere

Professional JSON Logic

You've written or received some JSON and something is off — your app is throwing a parse error, your API call is failing, or your config file isn't loading. The problem is somewhere in the JSON, but staring at brackets and commas trying to spot a missing quote is a frustrating way to spend time.

The Utilx JSON Validator gives you a straight answer: valid or not. If there's an error, it tells you exactly where — the line, the position, and what went wrong. It's free, runs entirely in your browser, and needs no account. Paste your JSON and know in under a second.

Privacy Protocol

Everything happens in your browser. Your JSON data is processed locally and never sent to our servers, keeping your API keys and sensitive data safe. No server logs, no tracking.

100% LOCAL BROWSER PROCESSING

When to Use This Tool

API Parse Errors

If your app is throwing an error and you're not sure where, paste it here for a specific location.

Manual Config Editing

Confirm your CI/CD, VS Code, or package settings are correct before committing code.

Sanity Checks

Verify third-party API payloads are well-formed before your code attempts to consume them.

Operational Workflow

PASTE YOUR JSON

Copy your JSON from a code editor, a curl response, or a .json config and paste it here.

CLICK VALIDATE

Hit Validate. The tool runs your JSON through a strict parser against the specification.

READ THE RESULT

Valid JSON gets a green confirmation. Invalid JSON gets a clear error message with line location.

FIX AND RE-VALIDATE

Edit the JSON directly in the input box, then validate again. Repeat until it's clean.

Real-World Use Case

"Pipeline Failure Solved"

Daniel, a backend developer, was setting up a GitHub Actions workflow and kept getting a cryptic pipeline failure. He pasted his appsettings.json into the Utilx JSON Validator and got an immediate result: "Unexpected token '}' at line 34, column 3" — a trailing comma left over from a block he had deleted earlier. He fixed it, re-validated (clean), pushed again, and the pipeline passed. Total time spent: under two minutes.

FAQs

Privacy Guarantee

This tool runs entirely in your browser using JavaScript — your JSON is never uploaded, never stored, and never seen by anyone but you.

Device Compatibility

Works in all modern browsers including Chrome, Firefox, Safari, and Edge — no plugins, extensions, or installations required.

Data & Docs