insomnia/plugins/insomnia-plugin-hash/index.js

const crypto = require('crypto');

module.exports.templateTags = [{
  name: 'hash',
  displayName: 'Hash',
  description: 'Apply hash to a value',
  args: [
    {
      displayName: 'Algorithm',
      type: 'enum',
      options: [
        {displayName: 'MD5', value: 'md5'},
        {displayName: 'SHA1', value: 'sha1'},
        {displayName: 'SHA256', value: 'sha256'},
        {displayName: 'SHA512', value: 'sha512'}
      ]
    },
    {
      displayName: 'Digest Encoding',
      description: 'The encoding of the output',
      type: 'enum',
      options: [
        {displayName: 'Hexadecimal', value: 'hex'},
        {displayName: 'Base64', value: 'base64'}
      ]
    },
    {
      displayName: 'Input',
      type: 'string',
      placeholder: 'Value to hash'
    }
  ],
  run (context, algorithm, encoding, value = '') {
    if (encoding !== 'hex' && encoding !== 'latin1' && encoding !== 'base64') {
      throw new Error(`Invalid encoding ${encoding}. Choices are hex, latin1, base64`);
    }

    const valueType = typeof value;
    if (valueType !== 'string') {
      throw new Error(`Cannot hash value of type "${valueType}"`);
    }

    const hash = crypto.createHash(algorithm);
    hash.update(value || '', 'utf8');
    return hash.digest(encoding);
  }
}];