how can i use ajv-i18n in fastify ？ - ajv

Question

Background
fastify
json schema
ajv
Problem
when i add the setErrorHandler to my project/index.js,it doesnt work.
require('module-alias/register')
const Fastify = require('fastify')
const PORT = process.env.PORT || 3000
const sequelize = require('./orm')
const swagger = require('./config').swagger
const localize = require('ajv-i18n')
const app = Fastify({
logger: {
prettyPrint: true
},
ajv: {
customOptions: {allErrors: true, jsonPointers: true },
plugins: [
require('ajv-errors')
]
}
})
app.register(require('fastify-sensible'))
app.register(require('fastify-swagger'), swagger)
app.register(require('./plugin/systemlogs'))
app.register(require('./plugin/authenticate')).then(()=>{
const routes = require('./routes')
routes(app).forEach((route, index) => {
app.route(route)
})
})
app.setErrorHandler((error,request,reply)=>{
if (error.validation) {
localize.ru(error.validation)
reply.status(400).send(error.validation)
return
}
reply.send(error)
})
const start = async () => {
try {
await sequelize.sync({})
app.log.info('database sync correctly')
await app.listen(PORT, '0.0.0.0')
app.swagger()
} catch (err) {
app.log.error(err)
process.exit(1)
}
}
start()
Question
i want to turn the error to chinese with ajv i18n ，what should i do? i do in this way but it doesnt work
how can i use ajv-i18n in fastify ？
where should i add the setErrorHandler?

Answer 1

there are another way to deal with this issue.
thanks:
L2jLiga https://github.com/L2jLiga
Manuel Spigolon
url:
https://github.com/fastify/help/issues/317
this is another way:
const fastify = require('fastify')
const localize = require('ajv-i18n')
const app = fastify({
ajv: {
customOptions: { allErrors: true, jsonPointers: true },
plugins: [
require('ajv-errors')
]
},
schemaErrorFormatter: (errors, dataVar) => {
localize.ru(errors);
const myErrorMessage = errors.map(error => error.message.trim()).join(', ');
return new Error(myErrorMessage)
}
})
app.get('/', {
schema: {
querystring: {
type: "object",
properties: { a: { type: "string", nullable: false } },
required: ["a"],
},
},
}, async function (req, res) {})
app.listen(3000)
and example of response:
{
"statusCode": 400,
"error": "Bad Request",
"message": "должно иметь обязательное поле a"
}

Answer 2

Here a working snippet to play with; I think your issue is on the routes' schemas.
const Fastify = require('fastify')
const localize = require('ajv-i18n')
const app = Fastify({
logger: true,
ajv: {
customOptions: { allErrors: true, jsonPointers: true }
}
})
app.post('/', {
schema: {
body: {
type: 'object',
properties: {
foo: { type: 'integer' }
}
}
}
}, () => {})
app.setErrorHandler((error, request, reply) => {
if (error.validation) {
localize.ru(error.validation)
reply.status(400).send(error.validation)
return
}
request.log.error({ err: error })
reply.send(error)
})
app.inject({
method: 'POST',
url: '/',
payload: {
foo: 'string'
}
}, (_, res) => {
console.log(res.json())
})
That will print out:
[
{
keyword: 'type',
dataPath: '/foo',
schemaPath: '#/properties/foo/type',
params: { type: 'integer' },
message: 'должно быть integer'
}
]