Nonstick Pancake Maker

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    3.3.0 • Public • Published


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    vfile utility to create a report in machine readable JSON.


    What is this?

    This package is like vfile-reporter but it outputs machine readable JSON.

    When should I use this?

    You can use this when you need to serialize lint results for machines, use vfile-reporter itself for humans.


    This package is ESM only. In Node.js (version 14.14+ and 16.0+), install with npm:

    npm install vfile-reporter-json

    In Deno with

    import {reporterJson} from ''

    In browsers with

    <script type="module">
      import {reporterJson} from ''


    import {VFile} from 'vfile'
    import {reporterJson} from 'vfile-reporter-json'
    const one = new VFile({path: 'test/fixture/1.js'})
    const two = new VFile({path: 'test/fixture/2.js'})
    one.message('Warning!', {line: 2, column: 4})
    console.log(reporterJson([one, two]))




    This package exports the identifier reporterJson. That identifier is also the default export.

    reporterJson(files[, options])

    Create a serialized JSON report from one file or multiple files.

    • files (VFile or Array<VFile>) — file or files to report
    • options (Options, optional) — configuration

    Report as serialized JSON (string).

    Reporters must return strings, which is why serialized JSON is exposed. You can parse the result with JSON.parse, in which case you will get Array<JsonFile>.


    JSON file (TypeScript type).

    • path (string) — full path (example: '~/index.min.js')
    • cwd (string) — base of path
    • history (Array<string>) — list of filepaths the file moved between; the first is the original path and the last is the current path
    • messages (Array<JsonMessage>) — list of filepaths the file moved between; the first is the original path and the last is the current path


    JSON message (TypeScript type).

    • stack (string | null) — stack of message; this is used by normal errors to show where something happened in programming code
    • reason (string) — reason for message; you should use markdown
    • fatal (boolean | null | undefined) — state of problem; true marks associated file as no longer processable (error); false necessitates a (potential) change (warning); null | undefined for things that might not need changing (info)
    • line (number | null) — starting line of error
    • column (number | null) — starting column of error
    • position (Position | null) — full unist position
    • source (string | null) — namespace of message (example: 'my-package')
    • ruleId (string | null) — category of message (example: 'my-rule')
    • actual (string | null | undefined) — specify the source value that’s being reported, which is deemed incorrect
    • expected (Array<string> | null | undefined) — suggest acceptable values that can be used instead of actual
    • url (string | null | undefined) — link to docs for the message; this must be an absolute URL that can be passed as x to new URL(x)
    • note (string | null | undefined) — long form description of the message (should use markdown)


    Configuration (TypeScript type).

    • pretty (number | string | boolean, default: 0) — value of space of JSON.stringify(x, undefined, space)
    • quiet (boolean, default: false) — do not show files without messages
    • silent (boolean, default: false) — show errors only; this does not show info and warning messages; also sets quiet to true


    This package is fully typed with TypeScript. It exports the additional types JsonFile, JsonMessage, and Options.


    Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.


    See in vfile/.github for ways to get started. See for ways to get help.

    This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.


    MIT © Titus Wormer


    npm i vfile-reporter-json

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