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JSON Shape Flattener & Merger

Flatten nested JSON objects, rebuild dot-path maps, and merge payloads with conflict tracking.

Flatten JSON

Create dot/bracket path maps from nested objects.

Nested inputFlattened output

{
  "user.id": 12,
  "user.name.first": "Ada",
  "user.name.last": "Lovelace",
  "user.roles[0]": "analyst",
  "user.roles[1]": "mathematician",
  "user.preferences.theme": "dark",
  "user.preferences.notifications.email": true,
  "user.preferences.notifications.sms": false,
  "meta.version": 4,
  "meta.updatedAt": "2024-05-01T12:00:00Z"
}

Paths10

Max depth4

Use $ for root when flattening primitives or empty objects.

Unflatten JSON

Rebuild nested structures from path maps.

Flat map inputNested output

{
  "user": {
    "id": 12,
    "name": {
      "first": "Ada",
      "last": "Lovelace"
    },
    "roles": [
      "analyst",
      "mathematician"
    ],
    "preferences": {
      "theme": "dark",
      "notifications": {
        "email": true,
        "sms": false
      }
    }
  },
  "meta": {
    "version": 4,
    "updatedAt": "2024-05-01T12:00:00Z"
  }
}

Keys14

Objects6

Arrays1

Merge JSON objects

Deep merge two documents with conflict insights.

Conflict resolutionArray strategy

Left JSONRight JSON

Keys12

Objects5

Arrays1

Merged output

{
  "user": {
    "id": 12,
    "name": "Ada Lovelace",
    "tags": [
      "algebra",
      "analysis",
      "logic"
    ],
    "preferences": {
      "theme": "dark",
      "notifications": {
        "email": true,
        "sms": false
      },
      "language": "en-GB"
    }
  },
  "meta": {
    "syncedAt": "2024-05-01T12:30:00Z"
  }
}

2 conflicts

$.user.nameright
Value overwritten
Left
```
"Ada"
```
Right
```
"Ada Lovelace"
```
$.user.tagsconcat
Arrays concatenated
Left
```
[
  "algebra"
]
```
Right
```
[
  "analysis",
  "logic"
]
```

How to use this tool

Use the flatten section to convert nested JSON into path/value maps.
Use the unflatten section to rebuild nested JSON from path keys.
Use merge controls to combine two JSON documents and inspect conflicts.

Flatten and unflatten workflow

Flattening outputs dot and bracket notation paths for each leaf value.
Unflattening reconstructs arrays and objects from those path keys.
Useful when moving between nested payloads and spreadsheet-style maps.

Merge behavior

Choose left or right preference for conflicting primitive values.
Configure array behavior as concatenate, replace, or merge-by-index.
Conflict details show path, resolution strategy, and both source values.

FAQ

Can this handle arrays in flattened keys?: Yes. Array indexes in brackets are supported when rebuilding nested structures.
Will merge always report conflicts?: Conflicts are reported only when values differ or types mismatch at the same path.
Is data processed locally?: Yes. Flattening, reconstruction, and merging run entirely in-browser.

ADVERT

Flatten JSON

Unflatten JSON

Merge JSON objects

How to use this tool

Flatten and unflatten workflow

Merge behavior

FAQ

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Flatten JSON

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