JSON Validator & Formatter
Validate, format, beautify, and minify your JSON data with real-time syntax error highlighting.
100% Client-Side (No data leaves your device)
Raw JSON Input
0 chars
1
Formatted Output
1
JSON output will appear here...
User Guide: How to Use the JSON Validator & Formatter
What is JSON Validation and Why Does it Matter?
JSON (JavaScript Object Notation) is the standard format for exchanging data on the web. A single syntax error—such as a missing quote, a trailing comma, or a wrong bracket—can crash APIs, disrupt microservices, or break UI states. Our client-side validator intercepts these errors in real-time, helping you debug before committing code.
Step-by-Step Instructions
- Enter your JSON: Paste your raw string in the Input panel. Or click Load Sample Data to explore the tool's formatting options.
- Choose Formatting: Select your preferred indentation (2 Spaces, 4 Spaces, or Tabs) and toggle Sort Keys to alphabetically sort object properties.
- Validate: Click Validate & Format. Standard JSON will format instantly with colored highlight syntax. If there's an error, it highlights the exact line in red.
- Export: Click Copy Output to copy standard JSON to your clipboard, or Download it directly as a
.jsonfile.
Common JSON Syntax Errors
- Single Quotes: Standard JSON strictly requires double quotes (
"key": "value") instead of single quotes ('key': 'value'). - Trailing Commas: Commas must not appear after the final key-value pair or array item (e.g.
[1, 2, 3,]is invalid). - Unquoted Keys: Object keys must always be enclosed in double quotes (e.g.
{name: "Sarah"}is invalid).
Example Walkthrough
Invalid Raw Input:
{ name: 'Sarah', "age": 30, }
Valid Formatted Output:
{
"name": "Sarah",
"age": 30
}