System Variables

System variables are useful to generate random/dynamic data for use in request query params or body. The format is {{#variableName}}

• {{#guid}} — Generates random uuid.
• {{#name}} - Generates random name.
• {{#string}} — Generates random string.
• {{#number}} — Generates random number between 1 to 1000000.
  • Custom Range: use {{#number, min, max}}
  • Example: {{#number, 100, 999}}
• {{#email}} — Generates random email.
• {{#bool}} — Generates true or false.
• {{#enum, val1, val2, val3,...}} — Generates one of the enum values provided (comma separated).
  • Example 1: {{#enum, red, green, blue}}
  • Example 2: {{#enum, 1, 2, 3}}
• {{#date}} — Generates unix date timestamp in milliseconds.
  • Custom date format: use {{#date, 'YYYY-MM-DD hh:mm:ss:fff'}}, the format should be in single quotes.
  • Unix timestamp: use {{#date, 'X'}}, this will output unix timestamp in seconds.
  • Manipulate date using format : {year:2, mon:-3, day:-2, hour:3, min:5, sec:7}
    • Example 1: {{#date, {year: -1, day: 3, mon: 5}}}
    • Example 2: {{#date,'YYYY-MM-DD', {year: -1}}}
• {{#dateISO}} — Generates date ISO format.
  • Manipulate date using format : {year:2, mon:-3, day:-2, hour:3, min:5, sec:7}
    • Example 1: {{#dateISO, {year: 1}}}
    • Example 2: {{#dateISO, { year : -1, day: 3 } }}

Using Node Modules to generate fake data

• You can use node libraries like faker-js (opens in a new tab), chance (opens in a new tab), falso (opens in a new tab) to generate random data in Pre Request Script.
• Use Pre Run tab -> Scripting tab to generate fake data using code.
• Example custom script

    // example code to load faker-js module
    var { faker } = await tc.loadModule("@faker-js/faker");
    tc.setVar("firstName", faker.person.firstName());
 
    // example code to load chance module
    var Chance = await tc.loadModule("chance");
    var chance = new Chance();
    tc.setVar("firstName", chance.name());
 
    // example code to load falso module
    var falso = await tc.loadModule("@ngneat/falso");
    var user = falso.randUser();
    tc.setVar("firstName", user.firstName);

NOTE

 // to save Env value to Active Environment
 tc.setVar("firstName", faker.person.firstName());
 
// If you do not want to save to the Environment file
// then use the request scope
 tc.setVar("firstName", faker.person.firstName(), "request");