diff --git a/lib/common/options.js b/lib/common/options.js
index 653dce4145..ce00835594 100644
--- a/lib/common/options.js
+++ b/lib/common/options.js
@@ -4,7 +4,7 @@ import fs from 'fs'
 import _ from 'lodash'
 import consola from 'consola'
 
-import { isUrl, isPureObject } from '../common/utils'
+import { isPureObject, isUrl } from '../common/utils'
 
 import modes from './modes'
 import defaults from './nuxt.config'
@@ -130,7 +130,8 @@ Options.from = function (_options) {
   const cspDefaults = {
     hashAlgorithm: 'sha256',
     allowedSources: undefined,
-    policies: undefined
+    policies: undefined,
+    reportOnly: options.debug
   }
   if (csp) {
     options.render.csp = _.defaults(_.isObject(csp) ? csp : {}, cspDefaults)
diff --git a/lib/core/middleware/nuxt.js b/lib/core/middleware/nuxt.js
index 35a4e68256..839f457d3c 100644
--- a/lib/core/middleware/nuxt.js
+++ b/lib/core/middleware/nuxt.js
@@ -70,7 +70,9 @@ export default async function nuxtMiddleware(req, res, next) {
 
     if (this.options.render.csp) {
       const { allowedSources, policies } = this.options.render.csp
-      res.setHeader('Content-Security-Policy', getCspString({ cspScriptSrcHashSet, allowedSources, policies, isDev: this.options.dev }))
+      const cspHeader = this.options.render.csp.reportOnly ? 'Content-Security-Policy-Report-Only' : 'Content-Security-Policy'
+
+      res.setHeader(cspHeader, getCspString({ cspScriptSrcHashSet, allowedSources, policies, isDev: this.options.dev }))
     }
 
     // Send response
diff --git a/test/unit/basic.ssr.csp.test.js b/test/unit/basic.ssr.csp.test.js
index 4d8dc5287d..e8dccffc62 100644
--- a/test/unit/basic.ssr.csp.test.js
+++ b/test/unit/basic.ssr.csp.test.js
@@ -3,156 +3,314 @@ import { getPort, loadFixture, Nuxt, rp } from '../utils'
 let port
 const url = route => 'http://localhost:' + port + route
 
-const startCSPTestServer = async (csp) => {
-  const options = loadFixture('basic', { render: { csp } })
+const startCspServer = async (csp, isProduction = true) => {
+  const options = loadFixture('basic', {
+    debug: !isProduction,
+    render: { csp }
+  })
   const nuxt = new Nuxt(options)
   port = await getPort()
   await nuxt.listen(port, '0.0.0.0')
   return nuxt
 }
 
+const getHeader = debug => debug ? 'content-security-policy-report-only' : 'content-security-policy'
+const cspHeader = getHeader(false)
+const reportOnlyHeader = getHeader(true)
+
+const startCspDevServer = async csp => startCspServer(csp, false)
+
 describe('basic ssr csp', () => {
-  test(
-    'Not contain Content-Security-Policy header, when csp is false',
-    async () => {
-      const nuxt = await startCSPTestServer(false)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
+  let nuxt
 
-      expect(headers['content-security-policy']).toBe(undefined)
+  afterEach(async () => {
+    await nuxt.close()
+  })
 
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain Content-Security-Policy header, when csp is set',
-    async () => {
-      const nuxt = await startCSPTestServer(true)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
-
-      expect(headers['content-security-policy']).toMatch(/^script-src 'self' 'sha256-.*'$/)
-
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain only unique hashes in header when csp is set',
-    async () => {
-      const nuxt = await startCSPTestServer(true)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
-
-      const hashes = headers['content-security-policy'].split(' ').filter(s => s.startsWith('\'sha256-'))
-      const uniqueHashes = [...new Set(hashes)]
-
-      expect(uniqueHashes.length).toBe(hashes.length)
-
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain Content-Security-Policy header, when csp.allowedSources set',
-    async () => {
-      const cspOption = {
-        allowedSources: ['https://example.com', 'https://example.io']
-      }
-
-      const nuxt = await startCSPTestServer(cspOption)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
-
-      expect(headers['content-security-policy']).toMatch(/^script-src 'self' 'sha256-.*'/)
-      expect(headers['content-security-policy'].includes('https://example.com')).toBe(true)
-      expect(headers['content-security-policy'].includes('https://example.io')).toBe(true)
-
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain Content-Security-Policy header, when csp.policies set',
-    async () => {
-      const cspOption = {
-        enabled: true,
-        policies: {
-          'default-src': [`'none'`],
-          'script-src': ['https://example.com', 'https://example.io']
-        }
-      }
-
-      const nuxt = await startCSPTestServer(cspOption)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
-
-      expect(headers['content-security-policy']).toMatch(/default-src 'none'/)
-      expect(headers['content-security-policy']).toMatch(/script-src 'sha256-(.*)?' 'self'/)
-      expect(headers['content-security-policy'].includes('https://example.com')).toBe(true)
-      expect(headers['content-security-policy'].includes('https://example.io')).toBe(true)
-
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain Content-Security-Policy header, when csp.policies.script-src is not set',
-    async () => {
-      const cspOption = {
-        enabled: true,
-        policies: {
-          'default-src': [`'none'`]
-        }
-      }
-
-      const nuxt = await startCSPTestServer(cspOption)
-      const { headers } = await rp(url('/stateless'), {
-        resolveWithFullResponse: true
-      })
-
-      expect(headers['content-security-policy']).toMatch(/default-src 'none'/)
-      expect(headers['content-security-policy']).toMatch(/script-src 'sha256-.*' 'self'$/)
-
-      await nuxt.close()
-    }
-  )
-
-  test(
-    'Contain only unique hashes in header when csp.policies is set',
-    async () => {
-      const policies = {
-        'default-src': [`'self'`],
-        'script-src': [`'self'`],
-        'style-src': [`'self'`]
-      }
-
-      const nuxt = await startCSPTestServer({
-        policies
-      })
-
-      for (let i = 0; i < 5; i++) {
-        await rp(url('/stateless'), {
+  describe('production mode', () => {
+    test(
+      'Not contain Content-Security-Policy header, when csp is false',
+      async () => {
+        nuxt = await startCspServer(false)
+        const { headers } = await rp(url('/stateless'), {
           resolveWithFullResponse: true
         })
+
+        expect(headers[cspHeader]).toBe(undefined)
       }
+    )
 
-      const { headers } = await rp(url('/stateful'), {
-        resolveWithFullResponse: true
-      })
+    test(
+      'Contain Content-Security-Policy header, when csp is set',
+      async () => {
+        nuxt = await startCspServer(true)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
 
-      const hashes = headers['content-security-policy'].split(' ').filter(s => s.startsWith('\'sha256-'))
-      const uniqueHashes = [...new Set(hashes)]
+        expect(headers[cspHeader]).toMatch(/^script-src 'self' 'sha256-.*'$/)
+      }
+    )
 
-      expect(uniqueHashes.length).toBe(hashes.length)
+    test(
+      'Contain Content-Security-Policy-Report-Only header, when explicitly asked for',
+      async () => {
+        nuxt = await startCspDevServer({reportOnly: true})
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
 
-      await nuxt.close()
-    }
-  )
+        expect(headers[reportOnlyHeader]).toMatch(/^script-src 'self' 'sha256-.*'$/)
+      }
+    )
+
+    test(
+      'Contain only unique hashes in header when csp is set',
+      async () => {
+        nuxt = await startCspServer(true)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        const hashes = headers[cspHeader].split(' ').filter(s => s.startsWith('\'sha256-'))
+        const uniqueHashes = [...new Set(hashes)]
+
+        expect(uniqueHashes.length).toBe(hashes.length)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy header, when csp.allowedSources set',
+      async () => {
+        const cspOption = {
+          allowedSources: ['https://example.com', 'https://example.io']
+        }
+
+        nuxt = await startCspServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[cspHeader]).toMatch(/^script-src 'self' 'sha256-.*'/)
+        expect(headers[cspHeader].includes('https://example.com')).toBe(true)
+        expect(headers[cspHeader].includes('https://example.io')).toBe(true)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy header, when csp.policies set',
+      async () => {
+        const cspOption = {
+          enabled: true,
+          policies: {
+            'default-src': [`'none'`],
+            'script-src': ['https://example.com', 'https://example.io']
+          }
+        }
+
+        nuxt = await startCspServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[cspHeader]).toMatch(/default-src 'none'/)
+        expect(headers[cspHeader]).toMatch(/script-src 'sha256-(.*)?' 'self'/)
+        expect(headers[cspHeader].includes('https://example.com')).toBe(true)
+        expect(headers[cspHeader].includes('https://example.io')).toBe(true)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy header, when csp.policies.script-src is not set',
+      async () => {
+        const cspOption = {
+          enabled: true,
+          policies: {
+            'default-src': [`'none'`]
+          }
+        }
+
+        nuxt = await startCspServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[cspHeader]).toMatch(/default-src 'none'/)
+        expect(headers[cspHeader]).toMatch(/script-src 'sha256-.*' 'self'$/)
+      }
+    )
+
+    test(
+      'Contain only unique hashes in header when csp.policies is set',
+      async () => {
+        const policies = {
+          'default-src': [`'self'`],
+          'script-src': [`'self'`],
+          'style-src': [`'self'`]
+        }
+
+        nuxt = await startCspServer({
+          policies
+        })
+
+        for (let i = 0; i < 5; i++) {
+          await rp(url('/stateless'), {
+            resolveWithFullResponse: true
+          })
+        }
+
+        const { headers } = await rp(url('/stateful'), {
+          resolveWithFullResponse: true
+        })
+
+        const hashes = headers[cspHeader].split(' ').filter(s => s.startsWith('\'sha256-'))
+        const uniqueHashes = [...new Set(hashes)]
+
+        expect(uniqueHashes.length).toBe(hashes.length)
+      }
+    )
+  })
+  describe('debug mode', () => {
+    test(
+      'Not contain Content-Security-Policy-Report-Only header, when csp is false',
+      async () => {
+        nuxt = await startCspDevServer(false)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[reportOnlyHeader]).toBe(undefined)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy header, when explicitly asked for',
+      async () => {
+        nuxt = await startCspDevServer({reportOnly: false})
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[cspHeader]).toMatch(/^script-src 'self' 'sha256-.*'$/)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy header, when csp is set',
+      async () => {
+        nuxt = await startCspDevServer(true)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[reportOnlyHeader]).toMatch(/^script-src 'self' 'sha256-.*'$/)
+      }
+    )
+
+    test(
+      'Contain only unique hashes in header when csp is set',
+      async () => {
+        nuxt = await startCspDevServer(true)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        const hashes = headers[reportOnlyHeader].split(' ').filter(s => s.startsWith('\'sha256-'))
+        const uniqueHashes = [...new Set(hashes)]
+
+        expect(uniqueHashes.length).toBe(hashes.length)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy-Report-Only header, when csp.allowedSources set',
+      async () => {
+        const cspOption = {
+          allowedSources: ['https://example.com', 'https://example.io']
+        }
+
+        nuxt = await startCspDevServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[reportOnlyHeader]).toMatch(/^script-src 'self' 'sha256-.*'/)
+        expect(headers[reportOnlyHeader].includes('https://example.com')).toBe(true)
+        expect(headers[reportOnlyHeader].includes('https://example.io')).toBe(true)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy-Report-Only header, when csp.policies set',
+      async () => {
+        const cspOption = {
+          enabled: true,
+          policies: {
+            'default-src': [`'none'`],
+            'script-src': ['https://example.com', 'https://example.io']
+          }
+        }
+
+        nuxt = await startCspDevServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[reportOnlyHeader]).toMatch(/default-src 'none'/)
+        expect(headers[reportOnlyHeader]).toMatch(/script-src 'sha256-(.*)?' 'self'/)
+        expect(headers[reportOnlyHeader].includes('https://example.com')).toBe(true)
+        expect(headers[reportOnlyHeader].includes('https://example.io')).toBe(true)
+      }
+    )
+
+    test(
+      'Contain Content-Security-Policy-Report-Only header, when csp.policies.script-src is not set',
+      async () => {
+        const cspOption = {
+          enabled: true,
+          policies: {
+            'default-src': [`'none'`]
+          }
+        }
+
+        nuxt = await startCspDevServer(cspOption)
+        const { headers } = await rp(url('/stateless'), {
+          resolveWithFullResponse: true
+        })
+
+        expect(headers[reportOnlyHeader]).toMatch(/default-src 'none'/)
+        expect(headers[reportOnlyHeader]).toMatch(/script-src 'sha256-.*' 'self'$/)
+      }
+    )
+
+    test(
+      'Contain only unique hashes in header when csp.policies is set',
+      async () => {
+        const policies = {
+          'default-src': [`'self'`],
+          'script-src': [`'self'`],
+          'style-src': [`'self'`]
+        }
+
+        nuxt = await startCspDevServer({
+          policies
+        })
+
+        for (let i = 0; i < 5; i++) {
+          await rp(url('/stateless'), {
+            resolveWithFullResponse: true
+          })
+        }
+
+        const { headers } = await rp(url('/stateful'), {
+          resolveWithFullResponse: true
+        })
+
+        const hashes = headers[reportOnlyHeader].split(' ').filter(s => s.startsWith('\'sha256-'))
+        const uniqueHashes = [...new Set(hashes)]
+
+        expect(uniqueHashes.length).toBe(hashes.length)
+      }
+    )
+  })
 })