---
title: "log"
description: "log"
language: "en"
canonical: "https://g2.antv.antgroup.com/en/manual/core/data/log/"
version: "5.4.8"
---

Print the current data in the Data Transform flow to the console for developers to debug the data processing process.

## Getting Started

```ts
const data = [
  { a: 1, b: 2, c: 3 },
  { a: 4, b: 5, c: 6 },
];

chart.options({
  type: 'view',
  data: {
    type: 'inline',
    value: data,
    transform: [
      { type: 'slice', start: 1 },
      { type: 'log' },
      { type: 'filter', callback: (d) => d.a < 3 },
    ],
  },
});
```

After adding the `log` above, it will print the data processed by `slice`, and this data will be used as the input for the next transform `filter`.