JSON Validator
Validate JSON syntax, format and beautify JSON, minify JSON, identify syntax errors and check basic JSON statistics directly in your browser.
JSON Validator & Formatter
Free Browser ToolProcessed JSON
What Is JSON?
JSON stands for JavaScript Object Notation. It is a lightweight text-based data format commonly used for storing and exchanging structured data.
JSON is widely used in websites, web applications, APIs, configuration files and software systems because its structure is relatively easy for both humans and computers to read.
JSON Validator Features
JSON Syntax Validation
The validator uses your browser's native JSON parser to determine whether the entered text can be parsed as valid JSON.
Format / Beautify JSON
Valid JSON can be formatted with indentation and line breaks, making nested data easier to read.
Minify JSON
Valid JSON can be converted into a compact representation by removing unnecessary whitespace.
Error Information
When the browser parser rejects the JSON, the tool displays the parser's error message to help you identify the problem.
JSON Statistics
The tool displays character count, line count, object-key count and approximate text size.
Copy JSON
Copy the current JSON from the editor to your clipboard when clipboard access is available in your browser.
Common JSON Errors
Missing Commas
Object properties and array elements generally need to be separated by commas.
Single Quotes
Standard JSON strings use double quotation marks rather than JavaScript-style single-quoted strings.
Unquoted Property Names
JSON object property names should normally be enclosed in double quotation marks.
Trailing Commas
Standard JSON does not allow a trailing comma after the final property or array element.
Incorrect Brackets
Make sure every opening curly or square bracket has a matching closing bracket.
Invalid Values
Standard JSON supports strings, numbers, objects, arrays, true, false and null.
How to Use the JSON Validator
Step 1: Paste Your JSON
Enter or paste your JSON data into the editor.
Step 2: Validate
Click Validate JSON. The tool will attempt to parse the JSON using your browser.
Step 3: Format the JSON
If the JSON is valid, click Format / Beautify to make the structure easier to read.
Step 4: Minify When Needed
Click Minify JSON to remove unnecessary whitespace from valid JSON.
Step 5: Copy the Result
Use the Copy JSON button to copy the JSON from the editor.
Who Can Use This JSON Validator?
- Web developers
- Software developers
- API developers
- Students learning JSON
- Bloggers and website owners
- Frontend developers
- Backend developers
- Anyone working with structured JSON data
It is particularly useful when you need a quick browser-based syntax check without installing a separate JSON editor.
Privacy and Data Processing
The core JSON validation, formatting and minification functions on this page are performed by JavaScript in your browser.
The JSON you enter is not intentionally sent to a dedicated validation server by the core tool functionality.
Normal website infrastructure, analytics, advertising or other third-party services enabled on the website may independently process technical information associated with your visit.
Read our Privacy Policy for more information.
Frequently Asked Questions
A JSON Validator checks whether JSON text can be parsed according to standard JSON syntax.
The tool uses the browser's built-in JSON parser to parse the JSON entered by the user. If parsing succeeds, the JSON is considered syntactically valid by the parser.
Yes. Enter valid JSON and click Format / Beautify to display the data with indentation and line breaks.
Yes. The Minify JSON button removes unnecessary whitespace from valid JSON.
The tool displays an error message returned by the browser's JSON parser. You can then review the syntax and correct the JSON.
The core validation, formatting and minification operations are performed in your browser and do not intentionally send the entered JSON to a dedicated validation server.
No. This tool checks JSON syntax and parsing. It does not validate your JSON against a custom JSON Schema.