amphtml-validator Node.js Package

This package is published and available at https://www.npmjs.com/package/amphtml-validator.

The source code is available at https://github.com/ampproject/amphtml/tree/main/validator/js/nodejs.

Command Line Tool

The amphtml-validator command line tool is documented here: https://amp.dev/documentation/guides-and-tutorials/learn/validation-workflow/validate_amp#command-line-tool

Node.js API

This API is new - feedback is especially welcome.

To install, use npm install amphtml-validator in your project directory, or add amphtml-validator as a dependency to your package.json.

You may save the following example into a file, e.g., demo.js.

'use strict';
var amphtmlValidator = require('amphtml-validator');

amphtmlValidator.getInstance().then(function (validator) {
  var result = validator.validateString('<html>Hello, world.</html>');
  (result.status === 'PASS' ? console.log : console.error)(result.status);
  for (var ii = 0; ii < result.errors.length; ii++) {
    var error = result.errors[ii];
    var msg =
      'line ' + error.line + ', col ' + error.col + ': ' + error.message;
    if (error.specUrl !== null) {
      msg += ' (see ' + error.specUrl + ')';
    }
    (error.severity === 'ERROR' ? console.error : console.warn)(msg);
  }
});

Now try running it:

$ node demo.js
FAIL
line 1, col 0: The mandatory attribute '⚡' is missing in tag 'html ⚡ for top-level html'. (see https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml#required-markup)
line 1, col 0: The parent tag of tag 'html ⚡ for top-level html' is '$root', but it can only be '!doctype'. (see https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml.html#required-markup)
...

As expected, this emits errors because the provided string in the example, <html>Hello, world.</html> is not a valid AMP HTML document.

The method validateString also takes a htmlFormat parameter which would allow applying the validator rules for AMP4ADS or AMP4EMAIL as well. `validateString(inputString, htmlFormat).

/**
 * Validates the provided inputString; the htmlFormat can be 'AMP' or
 * 'AMP4ADS'; it defaults to 'AMP' if not specified.
 * @param {string} inputString
 * @param {string=} htmlFormat
 * @return {!ValidationResult}
 * @export
 */

Release Notes

1.0.35

Set default engine to the WebAssembly version validator, which is https://cdn.ampproject.org/v0/validator_wasm.js. ampproject/amphtml #34213

1.0.34

Updated colors dependency version (ampproject/amphtml #31656).

1.0.33

Update repository location.

1.0.32

Removal of AMP Actions format as it is deprecated.

1.0.31

Fix Node API on Node > 12

1.0.30

Remove engine section from package.json to allow any version of nodejs.

1.0.29

Reintroduce node v8 support. Supports node v8, v10, v12 and v14.

1.0.28

Reintroduce node v10 support and introduce node v14 support.

1.0.27

Removed references to amp.validator.categorizeError.

1.0.26

Introduce node v12 support and remove node v10 support.

1.0.25

Broken release, removed.

1.0.24

Introduce node v10 support and remove node 8 support.

1.0.23

The amphtml-validator binary now requires the Node.js binary to be called node. On systems where the Node.js binary is called nodejs, consider installing the nodejs-legacy Debian package or better yet, NVM.

1.0.22

--html_format=AMP4EMAIL added.

1.0.21

--html_format=AMP4ADS is no longer experimental.

1.0.20

Better npm post-install for virtual machines, running debian over windows with SMB shared folder.

1.0.19

Set correct process exit status for old versions of Node.js (v0.10.25).

1.0.18

Small tweaks to this file and package.json.

1.0.17

If the amphtml-validator command is already patched up for Windows, leave it alone instead of failing. Relevant if the package has been installed globally and now we're performing a local install on top of it.

1.0.16

npm install amphtml-validator (local install) should now work on Windows, for require('amphtml-validator').

1.0.15

Added support for installing on Windows. npm install -g amphtml-validator should now just work.

1.0.13

Added newInstance method, a simple API that's not async.

1.0.12

Added support for --user-agent option.

1.0.11

Added support for AMP4ADS (via --html_format command line flag) and argument for validateString function in the API.