Free Developer Tool
JSON Key Counter
Count keys, objects and properties in JSON documents instantly.
What is JSON Key Counter?
The JSON Key Counter analyzes JSON documents and reports the total number of keys, helping developers understand document complexity and structure.
How to use
- Paste or upload JSON.
- Analyze the document.
- View the key count.
Features
- Count all keys
- Nested object support
- Fast analysis
- Instant results
Common Use Cases
- Analyzing JSON size
- Validating datasets
- Learning JSON structures
- Debugging APIs
Example
Input
{
"user":{
"name":"John",
"age":30
}
}Output
Total keys: 3
FAQ
Are nested keys included?
Yes. Every key in nested objects is counted.
Does it count array items?
Only object keys are counted, not array elements.
Can large JSON files be analyzed?
Yes. Performance depends mainly on your browser.
Missing a feature?
If this tool doesn't cover your use case or is missing functionality, please let me know through the Contact page.
New improvements and features are added based on user feedback.