> For AI agents: the complete documentation index is available at /en/llms.txt, the full documentation bundle is available at /en/llms-full.txt.

# JSON Data Matching Tool

[JSON Match & Update](https://tools.newzone.top/en/json-match-update) syncs values from a source dataset into corresponding fields of a target dataset. It matches rows by an ID field shared between the two JSON sources and writes the source value into the target's named field — useful for merging fresh counts, ratings, or any per-row attribute back into a canonical dataset.

![JSON Match Update Interface](/img/json-match-update-en.webp "JSON Match Update Interface")

## Usage Steps

1. **Prepare Your Data**:
   - **Original Data**: The complete JSON dataset that needs to be updated
   - **Target Data**: The JSON dataset containing the count values

2. **Input Data**:
   - Paste or upload your original JSON data in the left text box
   - Paste your target JSON data (with count values) in the right text box
   - You can also drag and drop `.txt` or `.json` files

3. **Configure Matching Fields**:
   - **Match Fields · source**: the unique identifier field in your original data (default: `id`)
   - **Match Fields · target**: the corresponding ID field in your target data (default: `card_id`)
   - **Update Fields · source**: the field in original data to be updated (default: `weight`)
   - **Update Fields · target**: the field in target data containing new values (default: `count`)

4. **Process Data**:
   - Click the "Start Process" button to execute the data matching and update

5. **View Results**:
   - Updated data will display in the result area below
   - Options to copy the complete result, copy only the JSON node content, or download the updated file

## Special Rules

- If an item in the original data has a Chinese title (`zh.title`) containing "失效" (invalid), its weight will automatically be set to 0
- If no corresponding item is found in the target data for an original data ID, that item remains unchanged

## Additional Features

- **Large-file friendly**: for bigger datasets, upload the file instead of pasting it into the text box
- **Reset Upload**: Clear uploaded files and text box contents

## Data Format Examples

Original data format:

```json
[
  {
    "id": 12345,
    "weight": 10,
    "zh": {
      "title": "Example Title"
    }
    // Other fields...
  }
]
```

Target data format:

```json
[
  {
    "card_id": 12345,
    "count": 25
  }
]
```

Result data:

```json
[
  {
    "id": 12345,
    "weight": 25, // Updated from count value
    "zh": {
      "title": "Example Title"
    }
    // Other fields remain unchanged...
  }
]
```