Skill

solid

Name: solid
Author: Vercel Labs

build SolidJS renderers for json-render

Published by Vercel Labs Updated Jul 17

Covers SolidJS Solid Frontend

Description

SolidJS renderer for json-render. Use when building @json-render/solid catalogs/registries, wiring Renderer providers, implementing bindings/actions, or troubleshooting Solid-specific reactivity patterns.

SKILL.md

@json-render/solid

@json-render/solid renders json-render specs into Solid component trees with fine-grained reactivity.

Quick Start

import { Renderer, JSONUIProvider } from "@json-render/solid";
import type { Spec } from "@json-render/solid";
import { registry } from "./registry";

export function App(props: { spec: Spec | null }) {
  return (
    <JSONUIProvider registry={registry} initialState={{}}>
      <Renderer spec={props.spec} registry={registry} />
    </JSONUIProvider>
  );
}

Create a Catalog

import { defineCatalog } from "@json-render/core";
import { schema } from "@json-render/solid/schema";
import { z } from "zod";

export const catalog = defineCatalog(schema, {
  components: {
    Button: {
      props: z.object({
        label: z.string(),
        variant: z.enum(["primary", "secondary"]).nullable(),
      }),
      description: "Clickable button",
    },
    Card: {
      props: z.object({ title: z.string() }),
      description: "Card container",
    },
  },
  actions: {
    submit: { description: "Submit data" },
  },
});

Define Components

Components receive ComponentRenderProps from the renderer:

interface ComponentRenderProps<P = Record<string, unknown>> {
  element: UIElement<string, P>;
  children?: JSX.Element;
  emit: (event: string) => void;
  on: (event: string) => EventHandle;
  bindings?: Record<string, string>;
  loading?: boolean;
}

Example:

import type { BaseComponentProps } from "@json-render/solid";

export function Button(props: BaseComponentProps<{ label: string }>) {
  return (
    <button onClick={() => props.emit("press")}>{props.props.label}</button>
  );
}

Create a Registry

import { defineRegistry } from "@json-render/solid";
import { catalog } from "./catalog";
import { Card } from "./Card";
import { Button } from "./Button";

const { registry, handlers, executeAction } = defineRegistry(catalog, {
  components: {
    Card,
    Button,
  },
  actions: {
    submit: async (params, setState, state) => {
      // custom action logic
    },
  },
});

Spec Structure

{
  "root": "card1",
  "elements": {
    "card1": {
      "type": "Card",
      "props": { "title": "Hello" },
      "children": ["btn1"]
    },
    "btn1": {
      "type": "Button",
      "props": { "label": "Click me" },
      "on": {
        "press": { "action": "submit" }
      }
    }
  }
}

Providers

StateProvider: state model read/write and controlled mode via store
VisibilityProvider: evaluates visible conditions
ValidationProvider: field validation + validateForm integration
ActionProvider: runs built-in and custom actions
JSONUIProvider: combined provider wrapper

Hooks

useStateStore, useStateValue, useStateBinding
useVisibility, useIsVisible
useActions, useAction
useValidation, useOptionalValidation, useFieldValidation
useBoundProp
useUIStream, useChatUI

Built-in Actions

Handled automatically by ActionProvider:

setState
pushState
removeState
validateForm

Dynamic Props and Bindings

Supported expression forms include:

{"$state": "/path"}
{"$bindState": "/path"}
{"$bindItem": "field"}
{"$template": "Hi ${/user/name}"}
{"$computed": "fn", "args": {...}}
{"$cond": <condition>, "$then": <value>, "$else": <value>}

Use useBoundProp in components for writable bound values:

import { useBoundProp } from "@json-render/solid";

function Input(props: BaseComponentProps<{ value?: string }>) {
  const [value, setValue] = useBoundProp(
    props.props.value,
    props.bindings?.value,
  );
  return (
    <input
      value={String(value() ?? "")}
      onInput={(e) => setValue(e.currentTarget.value)}
    />
  );
}

useStateValue, useStateBinding, and the state / errors / isValid fields from useFieldValidation are reactive accessors in Solid. Call them as functions inside JSX, createMemo, or createEffect.

Solid Reactivity Rules

Do not destructure component props in function signatures when values need to stay reactive.
Keep changing reads inside JSX expressions, createMemo, or createEffect.
Context values are exposed through getter-based objects so consumers always observe live signals.

Streaming UI

import { useUIStream, Renderer } from "@json-render/solid";

const stream = useUIStream({ api: "/api/generate-ui" });
await stream.send("Create a support dashboard");

<Renderer
  spec={stream.spec}
  registry={registry}
  loading={stream.isStreaming}
/>;

Use useChatUI for chat + UI generation flows.

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