---
title: "Download material property data as JSON"
method: GET
path: "/material_property_datasets/{property_id}/data"
tags: ["Material Property Datasets"]
---

# Download material property data as JSON

`GET /material_property_datasets/{property_id}/data`

Return the property dataset as a JSON object mapping column name to value array.

Supports optional downsampling (``max_points``) and x-range filtering
(``x_col`` + ``x_min`` + ``x_max``) for dynamic chart zoom resolution.

Example response::

    {
        "c_e": [0.5, 1.0, 1.5, 2.0],
        "kappa": [0.42, 0.71, 0.89, 0.95],
        "diffusivity": [3.2e-10, 2.8e-10, 2.3e-10, 1.9e-10]
    }

## Path parameters

- `property_id` string, required

## Query parameters

- `max_points` integer, nullable — Downsample to at most this many points
- `x_col` string, nullable — Column to filter by x range
- `x_min` number, nullable — Minimum x value (inclusive)
- `x_max` number, nullable — Maximum x value (inclusive)

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/ionworks/apis/fastapi.md) · [All operations](https://skmtc.dev/ionworks/apis/fastapi/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/ionworks/fastapi/revisions/7337a3cbdaf2/schema)