Transform request body

[cdtut]

What is the feature you are proposing?

Routes get request body with functions like await c.req.json(). In middleware you should be able to intercept and change the value the route gets with something like c.req.setJson(someTransformMethod(await c.req.json())).

[NicoPlyley]

If you would like to do that in the meantime, you can use c.set() / c.get() and pass the updated data to your route that way instead

[yusukebe]

As @NicoPlyley said, we can use c.set() / c.get(). Closing this.

[cdtut]

@yusukebe c.get() doesn't have same benefit. If some routes body need to be transformed and others don't it is inconsistent. Some will have to use c.get().json and others use c.req.json() which is confusing and bring mistakes.

If possible to transform a body before getting to route all route can use c.req.json() and know it is right data.

[yusukebe]

@cdtut

This way is not recommended because this API is for internal usage, but you can make it with the code:

app.use('*', async (c, next) => {
  const data = await c.req.json()
  //
  c.req.bodyCache.json = 'transformeddata'
  await next()
})

app.post('/', async (c) => {
  const data = await c.req.json()
  return c.json(data)
})

[cdtut]

Can internal c.req.bodyCache.json = data have external API like c.req.setJson(data) so can be used reliably? For all body requests not just json.

[yusukebe]

Can internal c.req.bodyCache.json = data have external API like c.req.setJson(data) so can be used reliably?

No. Basically, the Request body should be immutable, and we don't want to add more methods to the c.req.