Node js mosca broker error: Expected `schema` to be an object or boolean

user_13507959 0
Viewed 7959

I have created a simple broker:

var mosca = require("mosca");
var settings = {
  port: 1883,
};

var server = new mosca.Server(settings);

server.on("ready", function () {
  console.log("ready");
});

I get this error when i run i run the file:

/home//Documents/mqtt/node_modules/jsonschema/lib/validator.js:107
    throw new SchemaError('Expected `schema` to be an object or boolean');
    ^
SchemaError: Expected `schema` to be an object or boolean
    at Validator.validate (/home//Documents/mqtt/node_modules/jsonschema/lib/validator.js:107:11)
    at Object.validate (/home//Documents/mqtt/node_modules/mosca/lib/options.js:264:26)
    at new Server (/home//Documents/mqtt/node_modules/mosca/lib/server.js:104:34)
    at Object.<anonymous> (/home//Documents/mqtt/broker.js:16:14)
    at Module._compile (internal/modules/cjs/loader.js:1137:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
    at Module.load (internal/modules/cjs/loader.js:985:32)
    at Function.Module._load (internal/modules/cjs/loader.js:878:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  schema: undefined
}

I am running:

node: v12.18.4

npm: 6.14.6

mosca mqtt node.js
3 Answers

Like JD Allen said, better to run aedes than mosca, it's broken after it's dependency jsonschema updated to version 1.2.8, you can manually install jsonschema 1.2.6 to run it without error. it's not yet broken before updated to 1.2.8

user_92708470

comment this line in validator.js (\node_modules\jsonschema\lib\validator.js:111):

if((typeof schema !== 'boolean' && typeof schema !== 'object') || schema === null){
     throw new SchemaError('Expected `schema` to be an object or boolean');
}
user_145321060

In the runtime go to \node_modules\jsonschema\lib\validator.js. Replace the code on line 106 with

if((typeof schema == 'boolean' && typeof schema == 'object') || schema === null){

user_175632840
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