JSON Key Frequency Analyzer Online
Analyze how often each key appears across your JSON dataset. Our free JSON Key Frequency Analyzer is perfect for auditing API responses, datasets, and log files at scale.
About JSON Key Frequency Analyzer
When working with large JSON datasets, knowing which keys appear most often helps identify the core structure. This tool counts how many times each key appears across your entire JSON, showing frequency with visual bars.
How it works
Paste your JSON and click Analyze. The tool recursively scans every object, counting each key occurrence. Results are sorted by frequency with the most common keys at the top.
Each key shows a horizontal bar representing its frequency relative to the most common key. The count appears on the right. Copy or download the frequency data as JSON.
When you'd use this
You're analyzing API response logs to understand which fields are consistently present. Frequency analysis reveals optional vs required fields and data completeness patterns.
This counts key occurrences but doesn't analyze values. Two records with the same key but different value types are counted the same. For type analysis, use a schema tool.
Questions
How is frequency calculated?
Every occurrence of a key is counted, even in nested objects. If "id" appears in 100 user objects, its frequency is 100.
What do the bars represent?
Bars show relative frequency. The longest bar is the most common key. Other bars are scaled proportionally.
Are results sorted?
Yes, keys are sorted by frequency descending. The most common keys appear at the top for quick identification.
Can I export the frequency data?
Yes, use Copy to copy as JSON or Download to save as a file. The data is ready for further analysis or reporting.
Does it handle large datasets?
Yes, but very large JSON files may slow down your browser. Consider sampling for datasets over a few megabytes.