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SyntaxError: Token inesperado 2 en JSON en la posición 0

Estaba enviando datos desde el sitio del cliente => servidor => base de datos. Pero el error ocurre en la terminal del lado del servidor.

 syntaxError: Unexpected token 2 in JSON at position 0 at JSON.parse (<anonymous>) at createStrictSyntaxError (C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\body-parser\lib\types\json.js:160:10) at parse (C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\body-parser\lib\types\json.js:83:1S) at C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\body-parser\lib\read.js:128:18 at AsyncResource.runInAsyncScope (node:async_hooks:199:9) at invokeCallback (C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\raw-body\index.js:231:16) at done (C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\raw-body\index.js:220:7) at IncomingMessage.onEnd (C:\Users\ANUPAM\Desktop\assigment\assigment-11\book-hut-server\node_modules\raw-body\index.js:280:7) at IncomingMessage.emit (node:events:402:35) at endReadableNT (node:internal/streams/readable:1343:12)

Este es mi código del lado del cliente.

 fetch(putUrl, { method: "PUT", headers: { 'content-type': 'application/json' }, body: JSON.stringify(newQuantity) })

Este es el código del lado del servidor

 app.put('/update/:id', async (req, res) => { res.send('Go') })
about 3 years ago · Juan Pablo Isaza
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