The CLI provides a direct or automated way to fail the build and, by default, provides only summary information unless you use the --json or --sarif format. You can direct this output to a file; these files include the issues discovered. The formats are not human-readable.

You can use snyk-to-html (the Snyk JSON to HTML Mapper) to:

  • Create a readable build artifact as part of the output of a scan

  • Create an HTML report of the full context of a vulnerability that you can view in a browser

This page explains how to install snyk-to-html, use the snyk-to-html tool to export the test results in JSON or SARIF format to an HTML file, and view the test results in a browser.

Note, only json output is supported for Open Source (SCA) scans. sarif output will return no results from the snyk-to-html process for Open Source tests.

Install snyk-to-html

To install snyk-to-html, you must have the required permissions on your machine. If the installation fails, contact your IT administrator to request the required permissions.

You can install snyk-to-htmlusing npm:

npm install snyk-to-html -g

To install the snyk-to-html plugin locally, clone the snyk-to-html GitHub repository and use the script:

npm install
npm run build
node ./dist/index.js

Use the snyk-to-html tool

You can run snyk-to-html as part of a snyk test command to create a readable build artifact as part of the output of a test.

You can also run a snyk test command with the option to export the results to a JSON file and then convert the JSON file to HTML using snyk-to-html. You can export Snyk Code results to either a JSON or a SARIF file and convert that file to HTML.

When you run the snyk-to-html command, you can customize it with the following command options:







The input path of the JSON or SARIF file that contains the test results. SARIF format is not supported for open source scan results




Precedes the name of the output file of the HTML results.

Example: -o results.html




Template location for generating the HTML.




Generates an HTML file with only the summary instead of the details report.

Details vulnerability report



Display actionable remediation info if available.

Not applicable



Run the command in debug mode.

Not applicable

The snyk-to-html command does not generate the standard exit codes.

To display the help for snyk-to-htmlUse the command snyk-to-html --help or --h.

If you want to use the snyk-to-html command in a CI/CD pipeline, see the Snyk CI/CD integration examples for an example of a workaround for Azure Pipelines.

For more information, see Use snyk-to-html command options.

Create a readable build artifact as part of the output of a test

Follow these steps to create a build artifact by running snyk-to-html as part of a snyk test command. This streams the results directly to snyk-to-html.

  1. Change the directory to the root folder of the repository you want to test.

  2. To test the repository, export the results to a JSON format, and use the plugin to convert the output to an HTML file called results-[scantype].html.

The commands to use for each Snyk scanning method follow. When you run a command, an HTML file with one of the names in these examples is created in your repository folder, allowing you to view your test results in HTML format.

Snyk Open Source command

Run the following line to create a file called results-opensource.html:

snyk test --json | snyk-to-html -o results-opensource.html

Snyk Container command

Run the following to create a file called results-container.html:

snyk container test [image] --json | snyk-to-html -o results-container.html

Snyk Code command

Run the following to create a file called results-code.html:

snyk code test --json | snyk-to-html -o results-code.html

Snyk IaC command

Navigate to the subfolder with the related files and run the following line to create a file called results-iac.html:

snyk iac test --json | snyk-to-html -o results-iac.html

Convert a JSON or SARIF file to HTML to view in a browser

For automation purposes, you may be creating a JSON file for programmatic access to the results or already have one from a previous scan. You can send this JSON output to snyk-to-html to generate an HTML file.

Follow these steps to run snyk test and then convert the output file to HTML.

  1. Change the directory to the root folder of the repository you want to test.

  2. Run the appropriate test command for each product as shown: snyk test --json-file-output=results-opensource.json

    snyk code test --json-file-output=results-code.json

    snyk container test [image] --json-file-output=results-container.json

    snyk iac test --json-file-output=results-iac.json

    If an exit code stops the process before piping the output to the tool, refer to the note that follows these steps.

  3. Pass the JSON file to snyk-to-html to be converted to HTML. The input files should be valid JSON and use UTF-8 encoding. Ensure you use the name of the output file you generated: snyk-to-html -i results-opensource.json -o results-opensource.html snyk-to-html -i results-code.json -o results-code.html snyk-to-html -i results-container.json -o results-container.html snyk-to-html -i results-iac.json -o results-iac.html

When you use a multi-step approach like snyk test --json > result-opensource.json and then pass the results to a plugin, the exit code may stop or break the process on your build system before you get to the step of passing the output file to a tool like snyk-to-html or snyk-filter. You have several options, depending on the capabilities of your build tools: 1) Capture the exit code in a parameter to prevent it from being returned to the process in addition to checking for an error state. 2) Use ||true or some form of logic to prevent the exit code from terminating the process. Note that when you do this, any return code is ignored, such as error codes signifying network or Snyk platform issues or another non-scan result issue. The next step in using the JSON is likely to fail. It is recommended that you review the exit code before you proceed to the next step in your script. 3) Set the step to continue on failure, if such an option exists.

Use snyk-to-html command options

The following examples show the snyk test command; however, they will also work with the snyk test commands for container, code, and IaC.

Show a simple version of the report

Use the option -s or --summary to display only the summary of the report.

snyk-to-html -i results.json -o results.html -s

Show actionable remediation

To display the actions you can take to remedy vulnerabilities, use the -a or --actionable-remediation option.

snyk-to-html -i results.json -o results.html -a

The report sequences remediations, upgrades, and patches by the number and severity of vulnerabilities the remediation fixes. Use this as a guide when you are selecting the order in which to upgrade and patch packages.

Snyk supports remediation advice for the following package managers:

  • npm

  • Yarn

  • RubyGems

  • Maven

  • Gradle

  • sbt

  • Pip

View test results in HTML format

To view the HTML file, locate the output file in your repository and double-click it. If you used a different name for your HTML file, locate and open that file.

The test results report opens in the browser. The following example shows snyk code test results. You can view the Data Flow and Fix Analysis information for the issues discovered by clicking the corresponding buttons for each issue.


License: Apache License, Version 2.0

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