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Explanation

PUT method is used to completely
update a resource.

Code:

fetch('/users/1', {
  method: 'PUT',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ name: 'Updated Name' })
});

Explanation

PATCH method is used to partially update a resource.

Code:

fetch('/users/1', {
  method: 'PATCH',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ email: 'new@mail.com' })
});

Explanation

PUT replaces entire resource,
missing fields may be removed.

Code:

// PUT replaces full object

Explanation

PATCH modifies only specified fields.

Code:

// PATCH updates only provided fields

Explanation

Both PUT and PATCH are idempotent
if used correctly.

Code:

// Multiple identical PUT calls result in same resource state