JSON Merge
Merge two JSON objects or files with deep recursive merging, array concatenation, and client-side privacy.
How JSON Merge & Object Reconciliation Works & Technical Principles
Combine multiple JSON documents with intelligent conflict resolution directly in your browser. All reconciliation runs client-side with zero data upload.
Technical Overview: Deep Recursive Property Merging vs. Shallow Assignment
A shallow merge (like Object.assign) replaces nested object references entirely. In contrast, a deep merge traverses object properties recursively, preserving existing sub-keys while applying updates from secondary schemas or configurations.
Input & Configuration
Paste your base JSON object and the secondary JSON object you wish to merge.
Client-Side Processing
The algorithm traverses key hierarchies, comparing data types and combining nested properties based on your selected strategy.
Instant Output & Export
View the merged JSON object with syntax formatting, copy to clipboard, or download as a file.
Key Capabilities & Features
Deep Recursive Merging
Traverses nested objects of any depth, merging internal keys without overwriting parent containers.
Flexible Array Conflict Strategies
Choose whether matching array keys should be replaced, concatenated, or deduplicated.
100% In-Browser Privacy Guarantee
Internal app states and private server configs are merged securely inside your browser sandbox.
Real-Time Syntax Validation
Validates input JSON structures before merging to ensure malformed inputs don't corrupt output.
JSON Merge Patch specification for HTTP PATCH operations
The JavaScript Object Notation (JSON) Data Interchange Format