# Expressions #

Math.js contains a flexible and easy to use expression parser. The parser supports all data types, functions and constants available in math.js.

Whilst the math.js library is aimed at JavaScript developers, the expression parser is aimed at end users: mathematicians, engineers, students, pupils. The syntax of the expression parser differs from JavaScript and the low-level math.js library.

This section is divided in the following pages:

- Parsing and evaluation describes how to parse and evaluate expressions with math.js.
- Syntax describes how to write expressions.
- Expression trees explains how to parse an expression into an expression tree, and use this to analyse and manipulate the expression.
- Customization describes how to customize processing and evaluation of expressions.