Validate JSON

Validate JSON lets you instantly check if your JSON is valid or broken. Paste it, import a file, and get feedback with clean formatting and errors.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total characters: 0

How to Use:

Start by pasting your JSON into the left-hand box. If you have a saved file, hit “Choose File” to import it. The tool kicks in automatically and checks if the input is valid JSON. You’ll see either a pretty-formatted version with a “Valid JSON” message or a clear error line starting with “Invalid JSON.” You can copy the result, export it to a file, or clear everything in one click. And you’ll see a character count below to keep track of how large the output is.

What Validate JSON can do:

Validate JSON checks if your data structure is correct, catches missing brackets, bad quotes, or trailing commas, and shows you exactly what went wrong. If everything’s fine, it reformats your JSON neatly so it’s easier to read. This is helpful for debugging APIs, writing configuration files, or just double-checking any pasted block of data. The entire thing runs in your browser no uploads, no waiting. Just instant answers.

Example:

Input:

{ "name": "Alice", "age": 30 }

Output:

Valid JSON
{
  "name": "Alice",
  "age": 30
}

Broken Input Example:

{ "name": "Alice", "age": 30,, }

Output:

Invalid JSON
Unexpected token ',' at position 31

Common Use Cases:

Validate JSON is great when you’re troubleshooting data, working with APIs, or pasting in responses from other tools to clean them up. It helps catch small errors before they become big problems. Whether you’re testing webhooks, validating config files, or just need to tidy up some data, this tool saves time and effort.

Useful Tools & Suggestions:

Before validating, Fix Quotes in JSON can be used to clean up any syntax issues that might throw errors. And if you need to double-check structure visually, Prettify JSON lays it all out so problems are easier to spot.

Related Tools