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为了进行传出 api 调用，我使用了包装在 bluebird promise 对象中的 restler。但是，我得到了一个Possibly unhandled TypeError: Converting circular structure to JSONat node_modules/bluebird/js/main/promise.js。

即使没有 JSON.stringify，也会发生这种情况。它发生在 promise.js 的级别。

我能做些什么呢？

                rest.postJson(uri, body).then(
                    function(response) {
                        console.log(response.access.token.id);
                        console.log(response.statusCode);
                        res.send(response.access.token.id);
                    }, function(error) {
                        console.log(error.statusCode);
                        res.send(JSON.stringify(error));
                           //res.send(error);
                        }); 




Possibly unhandled TypeError: Converting circular structure to JSON
    at Object.stringify (native)
    at ServerResponse.res.json (/home/one/try/cloudimageshare-monitoring/project/node_modules/express/lib/response.js:205:19)
    at ServerResponse.res.send (/home/one/try/cloudimageshare-monitoring/project/node_modules/express/lib/response.js:121:21)
    at /home/one/try/cloudimageshare-monitoring/project/app/scripts/proxy/proxies_express_module.js:39:29
    at tryCatch1 (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/util.js:43:21)
    at Promise$_callHandler [as _callHandler] (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/promise.js:627:13)
    at Promise$_settlePromiseFromHandler [as _settlePromiseFromHandler] (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/promise.js:641:18)
    at Promise$_settlePromiseAt [as _settlePromiseAt] (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/promise.js:804:14)
    at Promise$_settlePromises [as _settlePromises] (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/promise.js:938:14)
    at Promise$_rejectPromises [as _rejectPromises] (/home/one/try/cloudimageshare-monitoring/project/node_modules/bluebird/js/main/promise.js:931:10)

更新：如果有帮助，这里是错误对象的键：

[ '_readableState',
  'readable',
  'domain',
  '_events',
  '_maxListeners',
  'socket',
  'connection',
  'httpVersion',
  'complete',
  'headers',
  'trailers',
  '_pendings',
  '_pendingIndex',
  'url',
  'method',
  'statusCode',
  'client',
  '_consuming',
  '_dumped',
  'httpVersionMajor',
  'httpVersionMinor',
  'upgrade',
  'req',
  'pipe',
  'addListener',
  'on',
  'pause',
  'resume',
  'read',
  'rawEncoded',
  'raw' ]
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1 回答 1

1

No. When you don't pass a string to express' res.send but an object (like error), it will call JSON.stringify internally. This will for sure not happen in promise.js (however, Bluebird does weird things to the stacktrace). Try

res.send(error.message);
于 2014-07-10T18:44:01.783 回答