Developer Tool
JSON Validator
Validate JSON syntax, identify parsing errors, and format valid JSON directly in your browser.
JSON Validator Tool
Paste JSON below and validate its syntax in your browser.
JSON keys and string values must use double quotation marks.
Example JSON
{
"name": "ToolNoveHub",
"type": "Online Tools",
"free": true,
"tools": [
"QR Code Generator",
"Word Counter",
"Age Calculator"
]
}How to use the JSON Validator
- 1. Paste or type your JSON into the input area.
- 2. Select Validate JSON to check the syntax.
- 3. If the JSON is invalid, review the parser error and check your syntax.
- 4. Use Format JSON to make valid JSON easier to read.
- 5. Use Copy to copy the JSON when needed.
Common JSON syntax errors
Trailing commas
JSON does not allow an extra comma after the final property in an object or the final item in an array.
Incorrect quotation marks
JSON strings and property names use double quotation marks, rather than single quotation marks.
Missing commas
Properties and array items generally need commas between them.
Unclosed brackets
Every JSON object and array needs its corresponding closing bracket or brace.
What is JSON?
JSON stands for JavaScript Object Notation. It is a lightweight text format used to represent structured data and is commonly used by web applications, APIs, configuration files, and software systems.
JSON supports objects, arrays, strings, numbers, booleans, and null values. Because JSON follows strict syntax rules, even a small punctuation or quotation error can make a document invalid.
Browser-based JSON validation
JSON validation and formatting are performed directly in your browser using JavaScript. The tool does not require an account or a separate server-side JSON processing service.
Your JSON does not need to be uploaded to a remote JSON validation service for these operations. As with any website, review the ToolNoveHub Privacy Policy for information about site-level analytics and other services.
For sensitive information, avoid entering confidential credentials, private keys, passwords, or other data that you would not normally place into a public website.
JSON Validator FAQ
What does a JSON validator check?
It parses the JSON and checks whether the document follows valid JSON syntax.
Can the validator find every programming error?
No. It checks JSON syntax and parsing validity. It does not determine whether the data is logically correct for your application or API.
Can I format valid JSON?
Yes. After parsing valid JSON, the Format JSON button adds indentation and line breaks to make the structure easier to read.
Do I need to install anything?
No. The tool works in a modern web browser with JavaScript enabled.