AllInOneTools

Online JSON Validator

Check if your JSON is valid instantly.

Description

Validate your JSON quickly and effortlessly with this free online JSON Validator. It checks the syntax and structure of your JSON and highlights any issues or errors.

How to Use

  1. Paste your JSON into the input field.
  2. Click the “Validate” button.
  3. View validation results and error messages instantly.

Features

  1. Instantly validates JSON and highlights whether it is valid or invalid.
  2. Displays detailed error messages for invalid JSON.
  3. Shows a clean and formatted version when the JSON passes validation.
  4. Works entirely in your browser — no data is uploaded.
  5. Supports long and deeply nested JSON structures.
  6. Developer-friendly interface using a monospaced font.

Frequently Asked Questions (FAQ)

What does this tool validate?
It validates whether your JSON is syntactically correct and properly structured.

What are common JSON errors?
Missing commas, trailing commas, single quotes instead of double quotes, and unclosed braces or brackets.

Does this tool pretty-print the JSON?
Yes. If the JSON is valid, you can display it in a readable format.

Is my JSON uploaded or stored?
No. Everything is processed locally in your browser.