{"id":735,"hash":"18cc5ec19d1fb451c9154de17920db676ba673ba2c3cd1d2f7c2c0db977d4bce","pattern":"Axios POST request fails with error status code 500: Internal Server error","full_message":"I'm trying to send a POST request locally with a username and password in the body through Axios. \n\nI'm deploying a Flask app on http://127.0.0.1:5000/login, which handles the /login route. The POST request fails with the following error\n\nPOST http://127.0.0.1:5000/login 500 (INTERNAL SERVER ERROR)\nError: Request failed with status code 500\n    at createError (createError.js:16)\n    at settle (settle.js:18)\n    at XMLHttpRequest.handleLoad (xhr.js:77)\n\nI researched a bit and thought it might be a problem with CORS, but this doesn't seem to be the case because I tried an Axios GET request and it worked fine (response logged properly). Here's part of my code\n\naxios.get(\"http://127.0.0.1:5000\").then(function(response) {\n        console.log(response);\n      }).catch(function(error) {\n        console.log(error);\n      })\naxios.post(\"http://127.0.0.1:5000/login\", {\n        username: this.state.username,\n        password: this.state.password\n      }).then(function(response) {\n        console.log(response);\n      }).catch(function(error) {\n        console.log(error);\n      })\n\nLooking at Chrome DevTools, I can see that the POST request payload is properly populated. I then tried printing out the keys server-side in the Flask app using the following code, but I got nothing, empty. (which was expected since the POST request failed)\n\ndict = request.form\n    for key in dict:\n        print('form key '+dict[key])\n\nHOWEVER using Postman with the corresponding keys and values works properly and returns a response and prints out the keys (see above). Where is the failure coming from? Why would the POST request fail when a GET seems to work just fine?","ecosystem":"npm","package_name":"post","package_version":null,"solution":"Feb 2021. Wasted 2 hours on this. Not much help on this famous library on internet.\n\nSolution:\n\nIn the catch block, the error which will always be 500 internal server error\nso, use error.response.data instead of error.\n\nCode:\n\ntry {\n  let result = await axios.post(          // any call like get\n    \"http://localhost:3001/user\",         // your URL\n    {                                     // data if post, put\n      some: \"data\",\n    }\n  );\n  console.log(result.response.data);\n} catch (error) {\n  console.error(error.response.data);     // NOTE - use \"error.response.data` (not \"error\")\n}\n\nUpdate:\n\nI ended up writing a common function for handing error:\n\nFile: common.app.js\n\nexport const errorUtils = {\n  getError: (error) => {\n    let e = error;\n    if (error.response) {\n      e = error.response.data;                   // data, status, headers\n      if (error.response.data && error.response.data.error) {\n        e = error.response.data.error;           // my app specific keys override\n      }\n    } else if (error.message) {\n      e = error.message;\n    } else {\n      e = \"Unknown error occured\";\n    }\n    return e;\n  },\n};\n\nMore info: https://github.com/axios/axios#handling-errors","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/50950011/axios-post-request-fails-with-error-status-code-500-internal-server-error","votes":53,"created_at":"2026-04-19T04:51:33.565405+00:00","updated_at":"2026-04-19T04:51:33.565405+00:00"}