codemirror-json-schema

Codemirror 6 extensions that provide full JSON Schema support for @codemirror/lang-json & codemirror-json5 language modes

Features

This is now a full-featured library for both json4 (aka json) and json5, but the APIs may still have breakages.

So far mostly tested with standard json4 schema specs. See

json4

• ✅ validates json
• ✅ autocompletion
• ✅ hover tooltips from schema

json5

• ✅ validates json5
• ✅ autocompletion
• ✅ hover tooltips

Usage

To give you as much flexibility as possible, everything codemirror related is a peer or optional dependency

Based on whether you want to support json4, json5 or both, you will need to install the relevant language mode for our library to use.

json4

with auto-install-peers true or similar:

npm install --save @codemirror/lang-json codemirror-json-schema

without auto-install-peers true:

npm install --save @codemirror/lang-json codemirror-json-schema @codemirror/language @codemirror/lint @codemirror/view @codemirror/state @lezer/common

Minimal Usage

This sets up @codemirror/lang-json and our extension for you. If you'd like to have more control over the related configurations, see custom usage below

import { EditorState } from "@codemirror/state";
import { jsonSchema } from "codemirror-json-schema";

const schema = {
  type: "object",
  properties: {
    example: {
      type: "boolean",
    },
  },
};

const json5State = EditorState.create({
  doc: "{ example: true }",
  extensions: [jsonSchema(schema)],
});

Custom Usage

This approach allows you to configure the json mode and parse linter, as well as our linter, hovers, etc more specifically.

import { EditorState } from "@codemirror/state";
import { linter } from "@codemirror/lint";
import { hoverTooltip } from "@codemirror/view";
import { json, jsonLanguage, jsonParseLinter } from "@codemirror/lang-json";
import { jsonCompletion jsonSchemaLinter, jsonSchemaHover } from "codemirror-json-schema";

const schema = {
  type: "object",
  properties: {
    example: {
      type: "boolean",
    },
  },
};

const state = EditorState.create({
  doc: `{ "example": true }`,
  extensions: [
    json(),
    linter(jsonParseLinter(), {
      // default is 750ms
      delay: 300
    }),
    linter(jsonSchemaLinter(schema)),
    jsonLanguage.data.of({
      autocomplete: jsonCompletion(schema),
    }),
    hoverTooltip(jsonSchemaHover(schema)),
  ];
})

json5

with auto-install-peers true or similar:

npm install --save codemirror-json5 codemirror-json-schema

without auto-install-peers true:

npm install --save codemirror-json5 codemirror-json-schema @codemirror/language @codemirror/lint @codemirror/view @codemirror/state @lezer/common

Minimal Usage

This sets up codemirror-json5 mode for you. If you'd like to have more control over the related configurations, see custom usage below

import { EditorState } from "@codemirror/state";
import { json5Schema } from "codemirror-json-schema/json5";

const schema = {
  type: "object",
  properties: {
    example: {
      type: "boolean",
    },
  },
};

const json5State = EditorState.create({
  doc: `{
    example: true,
    // json5 is awesome!
  }`,
  extensions: [json5Schema(schema)],
});

Custom Usage

This approach allows you to configure the json5 mode and parse linter, as well as our linter, hovers, etc more specifically.

import { EditorState } from "@codemirror/state";
import { linter } from "@codemirror/lint";
import { json5, json5ParseLinter, json5Language } from "codemirror-json5";
import {
  json5SchemaLinter,
  json5SchemaHover,
  json5Completion,
} from "codemirror-json-schema/json5";

const schema = {
  type: "object",
  properties: {
    example: {
      type: "boolean",
    },
  },
};

const json5State = EditorState.create({
  doc: `{
    example: true,
    // json5 is awesome!
  }`,
  extensions: [
    json5(),
    linter(json5ParseLinter(), {
      // the default linting delay is 750ms
      delay: 300,
    }),
    linter(json5SchemaLinter(schema)),
    hoverTooltip(json5SchemaHover(schema)),
    json5Language.data.of({
      autocomplete: json5Completion(schema),
    }),
  ],
});

Complete demo

You can start with the deployed example to see a more comprehensive setup.

API Docs

For more information, see the API Docs

Current Constraints:

• it only works with one json schema instance at a time, and doesn't yet fetch remote schemas. schema service coming soon!
• currently only tested with standard schemas using json4 spec. results may vary
• doesn't place cursor inside known insert text yet
• currently you can only override the texts and rendering of a hover. we plan to add the same for validation errors and autocomplete
• json5 properties on autocompletion selection will insert surrounding double quotes, but we plan to make it insert without delimiters

Inspiration

monaco-json and monaco-yaml both provide json schema features for json, cson and yaml, and we want the nascent codemirror 6 to have them as well!

Also, json5 is slowly growing in usage, and it needs full language support for the browser!

Our Goals

• working GeoJSON spec linter & completion
• working variables json mode for cm6-graphql, ala monaco-graphql
• json5 support for graphiql as a plugin!
• perhaps use @lezer to make a json5 language service for monaco-editor + json5?
• json5 + json4 json schema features for all!