What is Placeholder?

A question mark in SQL where a value goes, so the value is sent separately and can never become SQL. (From Node.js: Build the Back End and APIs. 1 other course defines it for their own subject, so each definition follows.)

A question mark in SQL where a value goes, so the value is sent separately and can never become SQL.

Node.js: Build the Back End and APIs

A named blank in a template, written in double curly braces such as {{tone}}, that you fill in each time you use it.

Prompt Engineering Essentials

Placeholder is defined in Node.js: Build the Back End and APIs and Prompt Engineering Essentials.

Node.js: Build the Back End and APIsPrompt Engineering Essentials

These lessons name it in their title or objectives:

• Node.js: Build the Back End and APIs, lesson 2.2: Build a tiny router
• Node.js: Build the Back End and APIs, lesson 3.2: Keep user input out of your SQL
• Prompt Engineering Essentials, lesson 5.4: Turn a Winner Into a Reusable Template

Next to Placeholder in the course glossaries: SQL injection, Migration, SQL, Hash, Database, Salt, Query string, Session token, JSON and Template.

SQL injectionMigrationSQLHashDatabaseSaltQuery stringSession tokenJSONTemplate

It depends on the course. Each course that teaches it lists its own prerequisites, and all are listed at intermediate and beginner level:

• Node.js: Build the Back End and APIs: Basic JavaScript: variables, functions, objects, arrays, conditions and loops.
• Prompt Engineering Essentials: No coding, statistics or prior AI experience needed.