Merge Multiple JSON Files

Combine multiple JSON files or environment configurations with custom collision rules and deep recursive object merging.

Merge Strategy:

On Key Collision:

Prototype Pollution Shield Active

#1base-config.json

#2staging-overrides.json

#3local-secrets.json

Editing: base-config.jsonjson

17 lines294 chars294 B

Ready•json

Consolidated Merged JSONjson

{
  "app": {
    "name": "DataTools Enterprise",
    "version": "1.1.0-rc3",
    "debug": true
  },
  "database": {
    "host": "staging-db.internal",
    "port": 5432,
    "poolSize": 5,
    "ssl": true,
    "timeoutMs": 3000
  },
  "features": {
    "offlineMode": true,
    "auditLogging": true,
    "experimentalCli": true,
    "darkTheme": true
  },
  "monitoring": {
    "prometheus": true,
    "intervalSec": 15
  },
  "auth": {
    "jwtExpiry": "1h",
    "issuer": "https://auth.datatools.dev"
  }
}

28 lines507 chars507 B

Ready•json

Merge Architecture & Security Considerations

Prototype Pollution Hardening

Every merge iteration rigorously scrubs forbidden prototype keys (__proto__, constructor, prototype), protecting your environment from malicious payload injections.

Layered Configuration Merging

Mimics the behavior of production configuration loaders (like Docker Compose, Helm, or Kubernetes configmaps). Later files override matching primitives while recursively preserving nested sibling properties.

Collision Resolution Control

Choose whether conflicts overwrite previous keys, preserve original values (skip), or append both values together into a combined array.