How do I read a CSV file in Zig?

With serde.zig: serde.csv.fromSliceManaged([]const Order, allocator, input) returns every row. The More menu copies this helper.

Why is a column optional?

At least one row left it empty. Click the field in the table to see how many rows had a value.

CSV to Zig struct

Paste a CSV with a header row. Every row is treated as a sample, so column types reflect the whole file, and the result parses with serde.zig as a slice of rows.

API responseSmallest int widths from observed range; auto enum suggestion; missing/null become optional.

Upload

id,customer,total,paid,shipped_at
1001,Alice,49.90,true,2026-03-02
1002,"Bob, Jr.",12.5,false,
1003,Carol,230,true,2026-03-04

Order.zig

const serde = @import("serde");

pub const Order = struct {
    id: u16,
    customer: []const u8,
    total: f64,
    paid: bool,
    shipped_at: ?[]const u8 = null,
};

Diagnostics

2 warnings

Field decisions

Why each field got its type. Click a row to see it in the input; edit to override.

struct Order $ 5 fields

How CSV columns become fields

The header row names the fields; each data row is one observation.
An empty unquoted cell makes the column optional, which is what serde.zig's CSV reader needs to accept it.
Quoted cells stay strings; unquoted cells become integers, floats or booleans only when every value parses.
Rows shorter than the header are reported, because serde.zig rejects them by default.

Questions

How do I read a CSV file in Zig?: With serde.zig: serde.csv.fromSliceManaged([]const Order, allocator, input) returns every row. The More menu copies this helper.
Why is a column optional?: At least one row left it empty. Click the field in the table to see how many rows had a value.