More JSON Tools
Compare, repair and transform JSON with related browser-based tools.
AI JSON Fixer
Repair malformed AI-generated JSON from ChatGPT, Claude and APIs.
Fix JSON ↗Opens sister site llmjsonfixer.comCompare Two JSON Files Online — JSON Diff Tool
This JSON diff tool compares two JSON objects and highlights added, removed and changed values. It is useful for comparing API responses, LLM outputs, configuration changes and structured data versions. All comparison runs locally in your browser.
- Compare two JSON objects side by side
- Find added, removed and changed keys and values
- Diff API responses and configuration files
- Compare AI-generated JSON outputs from different models
- Copy the diff result — fully browser-based, no upload
Frequently Asked Questions
How do I compare two JSON files online?
Paste the original JSON on the left and the updated JSON on the right, then click Compare JSON. The tool lists every added, removed and changed value.
What differences does the JSON diff tool detect?
It detects keys that were added or removed and values that changed between the two JSON objects, making it easy to spot structural and data differences.
Can I diff API responses and config files?
Yes. The JSON diff tool works with any valid JSON, so you can compare API responses, configuration files and structured data between versions.
Is the JSON diff tool private and safe?
Yes. All JSON comparison happens locally in your browser. Your JSON data is never uploaded to a server or stored.