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JSON Cleaner

FreePrivateRecursive

Strip null values, empty strings, and empty arrays from any JSON in one click. Cleans nested structures recursively.

Input JSON
Cleaned JSON
Ctrl+Enter Clean

Remove Null and Empty Values from JSON

Paste any JSON object and strip out null values, empty strings, empty arrays, and empty objects in one click. Ideal for cleaning API responses before storage, normalizing data shapes for downstream systems, and reducing unnecessary payload weight. 100% private, runs entirely in your browser.

Use Cases

API Response Cleanup
Third-party APIs often return dozens of null fields for optional properties. Strip them before persisting to a database or passing to a renderer. Format the raw payload first with the JSON Formatter to make it easier to read.
Data Normalization
Produce consistent shapes across records before loading into a data pipeline. After cleaning, generate a schema with the JSON Schema Generator to document the normalized structure.
Reducing Payload Size
Null fields contribute bytes without meaning. Removing them before serialization shrinks payloads, which matters for mobile clients and high-throughput APIs. Pair with JSON Repair to fix any structural issues before cleaning.
TypeScript Type Safety
Cleaned JSON without null noise produces tighter TypeScript interfaces. Run the output through the JSON to TypeScript generator to get precise, non-nullable type definitions.

How to Use

  1. Paste your JSON into the input panel
  2. Select which empty value types to remove: nulls, empty strings, empty arrays, empty objects
  3. Click Clean to strip the selected values recursively
  4. Copy or download the cleaned JSON output

Features

  • Removes null, empty strings, empty arrays, and empty objects
  • Toggleable filters: choose exactly which empty types to strip
  • Recursive: cleans nested objects and arrays to any depth
  • Shows a count of removed fields so you can audit the changes
  • 100% private: no server, no upload, no data leaves your browser

Frequently Asked Questions

Why remove null values from JSON?

Null and empty fields add payload weight without carrying useful data. Removing them reduces response size, simplifies downstream processing, and prevents null pointer errors in code that does not handle missing fields gracefully.

Will removing nulls break my data?

It depends on your use case. If your consumer explicitly checks for the presence of a key to determine state, removing that key changes the semantics. Always review the cleaned output before using it in production. The tool shows a preview so you can inspect every change first.

What counts as an empty value?

By default the tool removes keys whose value is null, an empty string (""), an empty array ([]), or an empty object ({}). You can toggle each category on or off to control exactly what gets stripped.

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