zed/docs/src/languages/json.md

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JSON	Configure JSON language support in Zed, including language servers, formatting, and debugging.

JSON

JSON support is available natively in Zed.

• Tree-sitter: tree-sitter/tree-sitter-json
• Language Server: zed-industries/json-language-server

JSONC

Zed also supports a super-set of JSON called JSONC, which allows single line comments (//) in JSON files. While editing these files you can use cmd-/ (macOS) or ctrl-/ (Linux) to toggle comments on the current line or selection.

JSONC Prettier Formatting

If you use files with the *.jsonc extension when using Format Document or have format_on_save enabled, Zed invokes Prettier as the formatter. Prettier has an outstanding issue where it will add trailing commas to files with a jsonc extension. JSONC files which have a .json extension are unaffected.

To workaround this behavior you can add the following to your .prettierrc configuration file:

{
  "overrides": [
    {
      "files": ["*.jsonc"],
      "options": {
        "parser": "json",
        "trailingComma": "none"
      }
    }
  ]
}

JSON Language Server

Zed automatically out of the box supports JSON Schema validation of package.json and tsconfig.json files, but json-language-server can use JSON Schema definitions in project files, from the JSON Schema Store or other publicly available URLs for JSON validation.

Inline Schema Specification

To specify a schema inline with your JSON files, add a $schema top level key linking to your json schema file.

For example, for a .luarc.json for use with lua-language-server:

{
  "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
  "runtime.version": "Lua 5.4"
}

Schema Specification via Settings

You can associate JSON Schemas with file paths using relative paths in your language server settings. Zed resolves paths relative to your project root:

"lsp": {
  "json-language-server": {
    "settings": {
      "json": {
        "schemas": [
          {
            "fileMatch": ["config/*.json"],
            "url": "./schemas/custom-schema.json"
          },
          {
            "fileMatch": ["*.config.json"],
            "url": "~/global-schemas/shared.json"
          },
          {
            "fileMatch": ["*/*.luarc.json"],
            "url": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json"
          }
        ]
      }
    }
  }
}

Paths starting with ./ resolve relative to the worktree root. Paths starting with ~/ expand to your home directory.

You can also pass any of the supported settings to json-language-server by specifying them in your Zed settings.json: