Zod•15mo ago

Do you mean dynamically create an

Do you mean dynamically create an arbitrary schema at runtime based on the shape of one object and then compare a second object using that dynamically generated schema? It's possible, although it will be quite difficult if you plan on support anything other than primitives (string, number, boolean, null, array, object, etc). Even object vs. record will be hard to infer at runtime without some guidance.

4 Replies

Unknown User•15mo ago

Message Not Public

Scott TrinhOP•15mo ago

If the object is all one level, you can loop over main object, and build a z.object dynamically. Something like:

import { z } from "zod";

const mainPalette = {
  foo: "bar",
  baz: 12,
};

const paletteSchema = Object.entries(mainPalette).reduce(
  (schema, [key, val]) => {
    const valSchema =
      typeof val === "string"
        ? z.string()
        : typeof val === "number"
        ? z.number()
        : z.unknown();
    return schema.extend({
      [key]: valSchema,
    });
  },
  z.object({}),
);

import { z } from "zod";

const mainPalette = {
  foo: "bar",
  baz: 12,
};

const paletteSchema = Object.entries(mainPalette).reduce(
  (schema, [key, val]) => {
    const valSchema =
      typeof val === "string"
        ? z.string()
        : typeof val === "number"
        ? z.number()
        : z.unknown();
    return schema.extend({
      [key]: valSchema,
    });
  },
  z.object({}),
);

https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAbzgLzgXzgMyhEcBEyEAJvgNwBQFAxhAHYDO8IAhsHQAosA2ApjDF5wAvIgpwsECAC4CAIxZR8AGnFwFyWQEYATKrSUa9JnDA9+ggMrUAFr1Yi4AeTkArXtRgA6XnRhRgXgYAClZ2Lj4BXgBKLyheYgBXal5gtWCGW3sWZTgAbQBrXgBPXIA3HgBdaJEAPjEJCVpGeAruazsHYTVGuBhisF4ITDg2kWFRfCYAugBzfB7euAB+FC9p9lng6MXe2X7B4dGeccm6RJA5XiVdxtXkL3PL6+3biVkHxLoCuggAdzo20ovXiMESUDocEynRYPgAHoI6MRgghboUSpVZG0OtlVL00NFgeg8WsIG4PDAUQTVISKEA

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Unknown User•15mo ago

Message Not Public

Scott TrinhOP•15mo ago

Yeah, I'd say Zod is pretty focused on matching compile-time behavior to a runtime, so since this is entirely runtime and dynamic, it's a little awkward to do it in Zod. Definitely doable, but just not really a target use case. There might be more dynamic validation/parsing libraries (especially from the JS ecosystem?) that might make this a bit easier, but if you're already using Zod in other places, makes sense to bend Zod around a bit.

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Programming

Do you mean dynamically create an