zu viel
too much
An excessive amount of something; more than is necessary, good, or desired.
Ich habe zu viel Kaffee getrunken und kann jetzt nicht schlafen.
I drank too much coffee and now I can't sleep.

too much
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too much
An excessive amount of something; more than is necessary, good, or desired.
Ich habe zu viel Kaffee getrunken und kann jetzt nicht schlafen.
I drank too much coffee and now I can't sleep.

The combination of 'zu' (too) and 'viel' (much) always expresses excess. Here, 'zu' means 'more than is good or necessary.'
In diesem Kuchen ist zu viel Zucker.
There is too much sugar in this cake.
'Zu viel' (too much) is used for things you cannot count, such as liquids, materials, or abstract concepts. It always remains unchanged and is not declined.
Er hat zu viel Geld für das alte Auto bezahlt.
He paid too much money for the old car.
In the expression 'jemandem zu viel werden' (to become too much for someone), the person who is overwhelmed is always in the dative. The thing that becomes too much is the subject of the sentence.
Die Verantwortung wird ihm langsam zu viel.
The responsibility is slowly becoming too much for him.
much / a lot
'viel' and 'zu viel' both talk about a large amount. The important difference is the evaluation. 'viel' only says that the amount is large. That can be positive, negative, or neutral. 'zu viel' means that the amount goes beyond a limit and is no longer good, necessary, or appropriate. Learners easily confuse the words because both are used with amounts. If you only mean a large amount, use 'viel'. If the amount is a problem, use 'zu viel'.

Nach drei Tassen Kaffee ist mir das heute zu viel.
After three cups of coffee, that is too much for me today.
Für die Prüfung muss ich noch viel lernen.
I still have to study a lot for the exam.