displaying-streamlit-data

Streamlit charts & data

Present data clearly.

Native charts first

Prefer Streamlit's native charts for simple cases.

st.line_chart(df, x="date", y="revenue")
st.bar_chart(df, x="category", y="count")
st.scatter_chart(df, x="age", y="salary")
st.area_chart(df, x="date", y="value")

Native charts support additional parameters: color for series grouping, stack for bar/area stacking, size for scatter point sizing, horizontal for horizontal bars. See the chart API reference for full options.

Human-readable labels

Use clear labels—not column names or abbreviations. Skip x_label/y_label if the column names are already readable.

# BAD: cryptic column names without labels
st.line_chart(df, x="dt", y="rev")

# GOOD: readable columns, no labels needed
st.line_chart(df, x="date", y="revenue")

# GOOD: cryptic columns, add labels
st.line_chart(df, x="dt", y="rev", x_label="Date", y_label="Revenue")

Altair for complex charts

Use Altair when you need more control. Altair is bundled with Streamlit (no extra install), while Plotly requires an additional package. Pick one and stay consistent throughout your app.

import altair as alt

chart = alt.Chart(df).mark_line().encode(
    x=alt.X("date:T", title="Date"),
    y=alt.Y("revenue:Q", title="Revenue ($)"),
    color="region:N"
)
st.altair_chart(chart, use_container_width=True)

When to use Altair:

• Custom axis formatting
• Multiple series with legends
• Interactive tooltips
• Layered visualizations

Dataframe column configuration

Use column_config where it adds value—formatting currencies, showing progress bars, displaying links or images. Don't add config just for labels or tooltips that don't meaningfully improve readability. Works with both st.dataframe and st.data_editor.

st.dataframe(
    df,
    column_config={
        "revenue": st.column_config.NumberColumn(
            "Revenue",
            format="$%.2f"
        ),
        "completion": st.column_config.ProgressColumn(
            "Progress",
            min_value=0,
            max_value=100
        ),
        "url": st.column_config.LinkColumn("Website"),
        "logo": st.column_config.ImageColumn("Logo"),
        "created_at": st.column_config.DatetimeColumn(
            "Created",
            format="MMM DD, YYYY"
        ),
        "internal_id": None,  # Hide non-essential columns
    },
    hide_index=True,
    use_container_width=True,
)

Note on hiding columns: Setting a column to None hides it from the UI, but the data is still sent to the frontend. For truly sensitive data, pre-filter the DataFrame before displaying.

Dataframe best practices:

• Hide useless index: hide_index=True
• Or make index meaningful: df = df.set_index("customer_name") before displaying
• Hide internal/technical columns: Set column to None in config (but pre-filter for sensitive data)
• Use visual column types where they help: sparklines for trends, progress bars for completion, images for logos

Column types:

• AreaChartColumn → Area sparklines
• BarChartColumn → Bar sparklines
• CheckboxColumn → Boolean as checkbox
• DateColumn → Date only (no time)
• DatetimeColumn → Dates with formatting
• ImageColumn → Images
• JSONColumn → Display JSON objects
• LineChartColumn → Sparkline charts
• LinkColumn → Clickable links
• ListColumn → Display lists/arrays
• MultiselectColumn → Multi-value selection
• NumberColumn → Numbers with formatting
• ProgressColumn → Progress bars
• SelectboxColumn → Editable dropdown
• TextColumn → Text with formatting
• TimeColumn → Time only (no date)

Pinned columns

Keep important columns visible while scrolling horizontally:

st.dataframe(
    df,
    column_config={
        "Title": st.column_config.TextColumn(pinned=True),  # Always visible
        "Rating": st.column_config.ProgressColumn(min_value=0, max_value=10),
    },
    hide_index=True,
)

Sparklines in metrics

Add chart_data and chart_type to metrics for visual context.

values = [700, 720, 715, 740, 762, 755, 780]

st.metric(
    label="Developers",
    value="762k",
    delta="-7.42% (MoM)",
    delta_color="inverse",
    chart_data=values,
    chart_type="line"  # or "bar"
)

Note: Sparklines only show y-values and ignore x-axis spacing. Use them for evenly-spaced data (like daily or weekly snapshots). For irregularly-spaced time series, use a proper chart instead.

See building-streamlit-dashboards for composing metrics into dashboard layouts.

References

• st.dataframe
• st.column_config
• st.metric
• st.line_chart
• st.bar_chart
• st.altair_chart