Validate json object

[syco]

Hi,
is it possible to use an array of chains [body('xx').isInt(), body('yy').isString()] or similar, against a json object instead of the request object?
I have complex validation arrays already built and I'm in the situation where I need to validate objects coming from a different source, not from an http request.
Would be great if I could use a logic like const result = validationResult(object, [body('xx').isInt(), body('yy').isString()]);

Thanks

[gustavohenke]

Hey,
In theory you can, it's how most of the tests are written, but all of express-validator assumes a request-like structure.

express-validator/src/express-validator.spec.ts

Lines 158 to 163 in 28a8d5f

	it('can be used on custom chains', async () => {
	const req = { query: { foo: 1 } };
	const { check, matchedData } = createInstance();
	await check('foo').isAllowedDomain().run(req);
	const data = matchedData(req);

...but this might be weird when you're not near the HTTP layer of your application (e.g. "why does this object have a body/cookie/query/header/param property")

You might like using pure validator.js instead: https://github.com/validatorjs/validator.js/
You'd need to validate each property you care about. And at of the time of writing, it'll throw if the input is not a string, which might or might not be annoying for you.

Then there are plenty other libraries for object validation out there.

[fedeci]

@gustavohenke do we want to make a shift allowing validations to run on express requests and on plain json objects too? It shouldn't be too tricky to implement and would provide a nice wrapper over validator.js.

[syco]

I think that would be great. The problem I'm trying to solve is that I have the validator chains already built and in a library I share between projects and I want to reuse them as much as possible, now I want to use the same chains to validate rows from a csv upload. And I would like every row in the CSV to be validated with the same chains I use for the post request.

…

On Sun, 19 Nov 2023, 10:06 Federico Ciardi, ***@***.***> wrote: @gustavohenke <https://github.com/gustavohenke> do we want to make a shift allowing validations to run on express requests and on plain json objects too? It shouldn't be too tricky to implement and would provide a nice wrapper over validator.js. — Reply to this email directly, view it on GitHub <#1264 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAANKL4PDI42QV6QKGXRTNDYFHK2NAVCNFSM6AAAAAA7JN573CVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQMJXHAYDOOJRHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[gustavohenke]

do we want to make a shift allowing validations to run on express requests and on plain json objects too?

Yeah, I think this can be done.

I'm marking this issue as an enhancement then, but please note it might take a few weeks/months before I'm able to get around to working on it @syco

[syco]

That's great news, thanks

[fedeci]

do we want to make a shift allowing validations to run on express requests and on plain json objects too?

Yeah, I think this can be done.

I'm marking this issue as an enhancement then, but please note it might take a few weeks/months before I'm able to get around to working on it @syco

I may do that this week. It shouldn't take me more than a couple hours to get it working.