Compare JSON Online: Best Tools and Dev Workflows in 2025

Every developer has Googled “compare JSON online” after being handed two blobs of data that look the same but cause very different results. While online tools help in a pinch, they’re not built for the realities of software testing.

Top Sites to Compare JSON Online:

• jsoncompare.com


• jsondiff.com


• codebeautify.org

These tools are fast and effective for:

• Visual diffs


• Nested comparisons


• Collapsing/expanding sections

Drawbacks:

• No history


• Can’t automate


• Data privacy concerns

Keploy: Going Beyond Ad-hoc Comparison

Keploy records actual API traffic and saves real responses. It compares these automatically during test replay.

Example Workflow:

1. Start Keploy


2. Call your API


3. Keploy saves response


4. Change your backend


5. Run tests → See JSON diffs

Why It Beats Online Tools

• Secure (local or encrypted)


• Repeatable tests


• GitHub CI compatible

Conclusion: Online JSON comparison tools are good one-time helpers. Keploy automates this at scale for serious API-driven development.

Read more on- https://keploy.io/blog/community/how-to-compare-two-json-files