JSON Validator
Validate JSON syntax instantly, detect parsing errors, inspect approximate error locations and format valid JSON directly in your browser.
Validate Your JSON
Check syntax and detect JSON parsing errors
JSON Input
Paste, type, upload or drop a JSON file
Tip: Press Ctrl + Enter or Cmd + Enter to validate instantly.
Validation Result
JSON syntax status and error information
Waiting
Ready to Validate
Enter JSON data in the editor to check its syntax.
Error Line
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Error Column
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JSON Statistics
Browser-Based JSON Validation
This implementation checks JSON directly in the browser with JavaScript. Validation, formatting and minification do not require the JSON text to be sent to a server.
Validator Features
Fast JSON Syntax Checking
Validate structured data, identify parsing problems and work with readable JSON from one simple interface.
Syntax Validation
Check whether JSON can be parsed successfully.
Error Detection
Display parser errors and approximate locations.
JSON Formatting
Beautify valid JSON with readable indentation.
Auto Validation
Automatically recheck JSON while editing input.
Three Simple Steps
How to Validate JSON Online
Enter JSON
Paste JSON into the editor, upload a file or drag and drop a JSON document.
Validate Syntax
Click Validate JSON or keep Auto Validate enabled while editing your data.
Review Result
Confirm valid syntax or use the parser error details to locate a problem faster.
JSON Validation Guide
What Is a JSON Validator?
A JSON Validator is a developer tool that checks whether JSON text follows valid syntax and can be parsed successfully. JSON is widely used for API responses, configuration files, application data, webhooks, frontend applications and communication between services.
Even a small syntax mistake can prevent JSON from being parsed. Missing commas, extra commas, incorrect quotation marks and mismatched brackets are common examples. A JSON syntax checker helps identify these problems before the data is used by an application.
Example of Valid JSON
{
"name": "Digital Tool Services",
"tool": "JSON Validator",
"features": [
"Validate",
"Format",
"Minify"
],
"free": true
}Common JSON Syntax Errors
Invalid JSON often results from small formatting mistakes. Property names must use double quotation marks, string values must be correctly quoted and object properties must be separated with commas. Standard JSON does not permit trailing commas after the final item in an object or array.
Missing Commas
Adjacent object properties or array values require separators.
Trailing Commas
Standard JSON does not allow a comma after the final item.
Single Quotes
JSON strings and property names require double quotation marks.
Mismatched Brackets
Objects and arrays must have correctly matched delimiters.
Why Validate JSON Before Using It?
Invalid JSON can cause failed API requests, application errors, broken configuration loading and unexpected data processing failures. Validation provides a quick way to confirm that the text is syntactically parseable before it enters another part of a development workflow.
JSON validation is especially useful when debugging API payloads, editing configuration files, testing webhooks, reviewing copied data and checking generated output from another system.
JSON Validator vs JSON Formatter
A JSON Validator focuses on checking whether data follows valid JSON syntax. A JSON Formatter focuses on presenting valid JSON with readable indentation and line breaks. These functions are related because JSON generally needs to parse successfully before it can be safely reformatted.
This page combines syntax validation with optional formatting and minification so valid data can be checked and transformed from the same interface.
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JSON Validator FAQs
Check Your JSON Syntax Now
Paste your JSON, validate its syntax and identify parsing problems with a fast browser-based tool.
Validate JSON →