How to say “I, John Smith, promise that …” ?

Question

Is the following the correct thing to say in French?

I, John Smith, promise that I will not work or carry out any professional activities

Je suis John Smith promesse que je ne vais pas travailler ou d'exercer toute activité professionnelle

Thanks.

Answer 1

If you are writing an affidavit for a visa or something like that, one could write

Je soussigné, Michel Dupont, né le 18 juin 1940 à Townsend (Royaume-Uni), m'engage à n'exercer aucune activité professionnelle, rémunérée ou non, lors de ce séjour en France.

But of course if this is a real legal question then you should get better help than some guy on the net answering a very unclear question. If you're applying for a visa then there's probably a boiler-plate phrase that you are supposed to copy and sign.

Answer 2

An informal way to express this is:

Moi, John Smith, (je) vous promets que …

The formal way (in written correspondance) is:

Je soussigné, John Smith, promets que …

Meaning, literally, that your signature is present at the end of the document.