Common Matchers in Jest
From the Jest cheat sheet · Matchers · verified Jul 2026
Common Matchers
Most frequently used Jest matchers for assertions
javascript
// Equality
expect(2 + 2).toBe(4) // Exact equality ===
expect({name: 'jest'}).toEqual({name: 'jest'}) // Deep equality
// Truthiness
expect(value).toBeTruthy()
expect(value).toBeFalsy()
expect(value).toBeNull()
expect(value).toBeUndefined()
expect(value).toBeDefined()
// Numbers
expect(2 + 2).toBeGreaterThan(3)
expect(2 + 2).toBeGreaterThanOrEqual(4)
expect(2 + 2).toBeLessThan(5)
expect(0.1 + 0.2).toBeCloseTo(0.3) // For floating point
// Strings
expect('team').toMatch(/I/)
expect('Christoph').toMatch('stop')
// Arrays and Iterables
expect(['Alice', 'Bob']).toContain('Alice')
expect(new Set(['Alice', 'Bob'])).toContain('Alice')
expect(['Alice', 'Bob']).toHaveLength(2)💡 Use toEqual for objects/arrays, toBe for primitives
⚡ toBeCloseTo is essential for floating point comparisons
📌 toStrictEqual checks undefined properties and array holes
🟢 Combine matchers with .not for negative assertions
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