formatResult

The formatResult function is part of Conform's future export. These APIs are experimental and may change in minor versions. Learn more

A helper that transforms Zod validation results into Conform's error format for form handling.

import { formatResult } from '@conform-to/zod/v3/future'; // Or import `@conform-to/zod/v4/future`.

const error = formatResult(result);

#Parameters

`result: SafeParseReturnType<any, any>`

The Zod validation result to be formatted. This should be the result from schema.safeParse() or schema.safeParseAsync().

`options.includeValue?: boolean`

Optional. Set to true if you want both the error and the parsed value returned in an object. This is useful when you are parsing the form value manually and still want to access the parsed value in the onSubmit handler on the useForm hook.

`options.formatIssues?: (issues: ZodIssue[], name: string) => ErrorShape[]`

Optional. A function to customize how zod issues are formatted for each field. This is particularly useful if you want to include additional information from the ZodIssue object in the error messages, or if you need to support internationalization.

const error = formatResult(result, {
  formatIssues: (issues, name) => {
    return issues.map((issue) => ({
      message: issue.message,
      code: issue.code,
      path: issue.path,
    }));
  },
});

#Returns

It returns the formatted error object by default:

FormError<string> | null;

If includeValue is set to true, it returns an object containing both the error and the parsed value instead:

{
  error: FormError<string> | null;
  value: Output | undefined;
}

#Example

Format Zod validation result on the server

import { formatResult } from '@conform-to/zod/v3/future'; // Or import `@conform-to/zod/v4/future`.
import { parseSubmission } from '@conform-to/react/future';
import { z } from 'zod';

const schema = z.object({
  email: z.string().email(),
  age: z.number().min(18),
  terms: z.boolean().refine((val) => val === true),
});

export async function action({ request }) {
  const formData = await request.formData();
  const submission = parseSubmission(formData);
  const result = schema.safeParse(submission.payload);

  if (!result.success) {
    return {
      result: report(submission, {
        error: formatResult(result),
      }),
    };
  }

  // Submission succeeded, process the parsed value with `result.data`
}

#Tips

Customize error shapes

The useForm hook offers built-in support of standard schema through the schema option. However, if you need to customize the error shapes, you will need to use the onValidate option instead and format the result manually with formatResult.

import { useForm } from '@conform-to/react/future';
import { formatResult } from '@conform-to/zod/v3/future';
import { z } from 'zod';

const schema = z.object({
  // ...
});

function Example() {
  const { form, fields } = useForm({
    onValidate({ value }) {
      const result = schema.safeParse(value);
      return formatResult(result, {
        includeValue: true,
        formatIssues(issues, name) {
          return issues.map(
            (issue) => `Field "${name}" is invalid: ${issue.message}`,
          );
        },
      });
    },
    onSubmit(event, { value }) {
      event.preventDefault();

      // This is called only if there are no validation errors with the parsed `value`.
      // It will throw if no value is included in the onValidate return value.
    },
  });

  // ...
}