JSON Merge

Deep merge two JSON objects. Paste the base object as input, add the second object in Tool Settings, and click Run.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about merging JSON objects

How to Deep Merge JSON Objects

JSON Merging

When to Merge JSON

Combine default and override configs, merge API partial updates, or join environment-specific settings into one object.

Frequently asked questions

How are nested objects merged?

Nested objects are merged recursively. Keys from the second object override or extend keys in the first.