[Home](./index.md) > [@datashaper/schema](./schema.md) > [FieldMetadata](./schema.fieldmetadata.md) ## FieldMetadata interface Holds core metadata/stats for a data field. Signature: ```typescript export interface FieldMetadata ``` ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [bins?](./schema.fieldmetadata.bins.md) | | [Bin](./schema.bin.md)\[\] | (Optional) Computed histogram bins for numeric fields. | | [categories?](./schema.fieldmetadata.categories.md) | | [Category](./schema.category.md)\[\] | (Optional) List of unique categories for string fields. | | [count?](./schema.fieldmetadata.count.md) | | number | (Optional) Count of valid values in the column (excluding invalid, null, etc.) | | [distinct?](./schema.fieldmetadata.distinct.md) | | number | (Optional) Count of unique values in the column | | [invalid?](./schema.fieldmetadata.invalid.md) | | number | (Optional) Count of invalid/null values in the column | | [magnitude?](./schema.fieldmetadata.magnitude.md) | | number | (Optional) Magnitude of the data, i.e., the absolute difference between the min and max values. | | [maximum?](./schema.fieldmetadata.maximum.md) | | number | (Optional) Max value. Note that this can be specified rather than computed, in which case it defines valid boundaries for the data values. | | [mean?](./schema.fieldmetadata.mean.md) | | number | (Optional) Mean. | | [median?](./schema.fieldmetadata.median.md) | | number | (Optional) Median. | | [minimum?](./schema.fieldmetadata.minimum.md) | | number | (Optional) Min value. Note that this can be specified rather than computed, in which case it defines valid boundaries for the data values. | | [mode?](./schema.fieldmetadata.mode.md) | | string \| number \| boolean \| Date | (Optional) Mode | | [stdev?](./schema.fieldmetadata.stdev.md) | | number | (Optional) Standard deviation. | | [type?](./schema.fieldmetadata.type.md) | | [DataType](./schema.datatype.md) | (Optional) TEMP: this is determined via stats introspection, but our much more robust type discovery for the codebooks should be used, and the type on Field. |