JSON Validator & Formatter

How to use this tool

Instant Local Linting

Your sensitive configuration files and API keys never leave your computer. All parsing, validation, and pretty-printing happen inside your local browser memory.

Operational Steps

How to Validate Your JSON

Customize and clean up your JSON objects in seconds:

Paste Code

Paste your raw, unformatted, or broken JSON string into the editor canvas.

Format/Minify

Choose to prettify with clean spacing (2-space / 4-space layout) or squeeze it to a single line using Minify.

Locate Errors

If invalid, the inline error tracker points to the exact line, character, and error type instantly.

JSON Standards

Common JSON Formatting Rules

Ensure your payload adheres to standard specifications to prevent parsing errors:

❌ Trailing Commas are Invalid

JSON doesn’t allow trailing commas after the last item of an array or object.

// Invalid
{
  "name": "Tools",
}

❌ Single Quotes are Invalid

Keys and string values MUST be enclosed in double quotes (").

// Invalid
{ 'id': 'my-tool' }

Common Inquiries

Frequently Asked Questions

Quick answers to common questions about linter settings, errors, and files.

Why did my JSON fail to parse in my script, but formatted here?

Our formatter identifies small syntax mismatches like missing quotes or invalid brackets and highlights them. If it formatted successfully here, it means the errors were fixed during beautification. Verify that you copied the formatted output back to your script.

Does this support JSONL (JSON Lines)?

No, this linter is built for standard JSON structures (single object or array). If you feed it multiple line-separated JSON records, it will flag a syntax error at the start of the second line.

Awaiting Input

Validation Failed