`app.put()`

Registers a route handling HTTP PUT requests for full resource replacement.

Since Fastify 5 Spec ↗

Syntax

app.put(url, options?, handler)

Parameters

Name	Type	Required	Description
`url`	`string`	No	The route path.
`options`	`RouteShorthandOptions`	No	Optional schema, hooks, and config.
`handler`	`Function`	No	Async handler receiving (request, reply).

Returns

FastifyInstance — The instance, for chaining.

Examples

import Fastify from 'fastify';

const app = Fastify();

app.put<{ Params: { id: string }; Body: { name: string } }>(
  '/cats/:id',
  async (req) => {
    return { id: req.params.id, name: req.body.name };
  },
);

Notes

PUT should fully replace the resource and be idempotent. Validate both params and body with a schema for safety.