openapi-backend: TypeError: Converting circular structure to JSON

I’m trying to use a YAML file to create a mock. I’m using example “express-ts-mock” (https://github.com/anttiviljami/openapi-backend/blob/master/examples/express-ts-mock/index.ts)

but this is the result…

snakuzzo@laptop:~/workspace/openapi-backend/examples/express-ts-mock$ npm start

> openapi-backend-express-ts-mock@1.0.0 start /home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock
> node dist/index.js

api listening at http://localhost:9000
(node:90915) UnhandledPromiseRejectionWarning: TypeError: Converting circular structure to JSON
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:42:19)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
    at stringify (/home/snakuzzo/workspace/openapi-backend/examples/express-ts-mock/node_modules/fast-json-stable-stringify/index.js:50:25)
(node:90915) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:90915) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Any suggestion?

Thanks

About this issue

Original URL
State: open
Created 4 years ago
Comments: 20 (11 by maintainers)

Most upvoted comments

@snakuzzo I’ve added a PR which should address this problem without re-writing too much of the library. Until it gets merged however, you may be able to solve the problem by using this in your constructor:

customizeAjv: (ajv, ajvOpts, ValidationContext) => {
	const oldCompile = ajv.compile.bind(ajv);
	ajv.compile = (schema) => {
		const decycledSchema = decycle(schema);
		return oldCompile(decycledSchema);
	}
	return ajv;
}

where decycle is a new function which you can find in the PR.

elby22 on Dec 8, 2020

And apologies to both of you @elby22 @snakuzzo for the delay with getting back to you. I’ve recently joined a new company, which (I hope) understandably is stretching my available time for OSS maintenance work 😔

anttiviljami on Jan 10, 2021

@snakuzzo working on a PR now - trying to get it out by today.

elby22 on Nov 24, 2020