diff --git a/examples/v8-profiler/.gitignore b/examples/v8-profiler/.gitignore
new file mode 100644
index 0000000..841aa42
--- /dev/null
+++ b/examples/v8-profiler/.gitignore
@@ -0,0 +1,9 @@
+.DS_Store
+node_modules
+*.0x
+.__browserify_string_empty.js
+win
+todo
+.vscode
+flamegraph.html
+v8-profile.json
diff --git a/examples/v8-profiler/README.md b/examples/v8-profiler/README.md
new file mode 100644
index 0000000..356b589
--- /dev/null
+++ b/examples/v8-profiler/README.md
@@ -0,0 +1,14 @@
+# 0x-visualize-v8-profile-example
+
+You need curl installed. This will probably work on linux and macOS.
+
+Running:
+
+```bash
+npm i
+./test.sh
+```
+
+Then open flamegraph.html, click on `v8` button and you should see something like this:
+
+![flamegraph](flamegraph.png)
diff --git a/examples/v8-profiler/flamegraph.png b/examples/v8-profiler/flamegraph.png
new file mode 100644
index 0000000..3d3e5d9
Binary files /dev/null and b/examples/v8-profiler/flamegraph.png differ
diff --git a/examples/v8-profiler/index.js b/examples/v8-profiler/index.js
new file mode 100644
index 0000000..401bd90
--- /dev/null
+++ b/examples/v8-profiler/index.js
@@ -0,0 +1,36 @@
+const v8Profiler = require('v8-profiler-next')
+const Koa = require('koa')
+const Router = require('koa-router')
+const fs = require('fs')
+const { promisify } = require('util')
+
+const writeFile = promisify(fs.writeFile)
+
+let app = new Koa()
+let router = new Router()
+
+router.get('/', (ctx, next) => {
+  // ctx.router available
+  ctx.body = 'ok'
+})
+
+router.get('/start-profiling', (ctx, next) => {
+  v8Profiler.startProfiling('p1')
+  ctx.body = 'started'
+})
+
+router.get('/stop-profiling', async (ctx, next) => {
+  const result = v8Profiler.stopProfiling('p1')
+  if (result) {
+    await writeFile('./v8-profile.json', JSON.stringify(result))
+    ctx.body = 'saved profile'
+  } else {
+    ctx.body = 'nothing to show'
+  }
+})
+
+app
+  .use(router.routes())
+  .use(router.allowedMethods())
+
+app.listen(3000)
diff --git a/examples/v8-profiler/package-lock.json b/examples/v8-profiler/package-lock.json
new file mode 100644
index 0000000..cd1dfe1
--- /dev/null
+++ b/examples/v8-profiler/package-lock.json
@@ -0,0 +1,6415 @@
+{
+  "name": "0x-visualize-v8-profile-example",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "0x": {
+      "version": "file:../..",
+      "requires": {
+        "ajv": "^6.5.4",
+        "browserify": "^16.2.3",
+        "concat-stream": "^1.5.2",
+        "d3-fg": "^6.3.1",
+        "debounce": "^1.2.0",
+        "debug": "^4.0.1",
+        "end-of-stream": "^1.1.0",
+        "env-string": "^1.0.0",
+        "escape-string-regexp": "^1.0.5",
+        "execspawn": "^1.0.1",
+        "has-unicode": "^2.0.1",
+        "hsl-to-rgb-for-reals": "^1.1.0",
+        "jsonstream2": "^1.1.1",
+        "make-dir": "^1.3.0",
+        "minimist": "^1.2.0",
+        "morphdom": "^2.3.3",
+        "nanohtml": "^1.0.1",
+        "on-net-listen": "^1.1.0",
+        "opn": "^5.4.0",
+        "perf-sym": "^2.0.3",
+        "pump": "^3.0.0",
+        "pumpify": "^1.4.0",
+        "semver": "^5.5.1",
+        "single-line-log": "^1.0.1",
+        "split2": "^3.0.0",
+        "tachyons": "^4.9.1",
+        "through2": "^2.0.1",
+        "which": "^1.2.4"
+      },
+      "dependencies": {
+        "JSONStream": {
+          "version": "1.3.5",
+          "bundled": true,
+          "requires": {
+            "jsonparse": "^1.2.0",
+            "through": ">=2.2.7 <3"
+          }
+        },
+        "acorn": {
+          "version": "6.0.3",
+          "bundled": true
+        },
+        "acorn-dynamic-import": {
+          "version": "4.0.0",
+          "bundled": true
+        },
+        "acorn-jsx": {
+          "version": "5.0.0",
+          "bundled": true
+        },
+        "acorn-node": {
+          "version": "1.6.2",
+          "bundled": true,
+          "requires": {
+            "acorn": "^6.0.2",
+            "acorn-dynamic-import": "^4.0.0",
+            "acorn-walk": "^6.1.0",
+            "xtend": "^4.0.1"
+          }
+        },
+        "acorn-walk": {
+          "version": "6.1.0",
+          "bundled": true
+        },
+        "ajv": {
+          "version": "6.5.4",
+          "bundled": true,
+          "requires": {
+            "fast-deep-equal": "^2.0.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "ajv-keywords": {
+          "version": "3.2.0",
+          "bundled": true
+        },
+        "ansi-escapes": {
+          "version": "3.1.0",
+          "bundled": true
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true
+        },
+        "ansi-styles": {
+          "version": "2.2.1",
+          "bundled": true
+        },
+        "ansicolors": {
+          "version": "0.2.1",
+          "bundled": true
+        },
+        "argparse": {
+          "version": "1.0.10",
+          "bundled": true,
+          "requires": {
+            "sprintf-js": "~1.0.2"
+          }
+        },
+        "array-filter": {
+          "version": "0.0.1",
+          "bundled": true
+        },
+        "array-includes": {
+          "version": "3.0.3",
+          "bundled": true,
+          "requires": {
+            "define-properties": "^1.1.2",
+            "es-abstract": "^1.7.0"
+          }
+        },
+        "array-map": {
+          "version": "0.0.0",
+          "bundled": true
+        },
+        "array-reduce": {
+          "version": "0.0.0",
+          "bundled": true
+        },
+        "array-union": {
+          "version": "1.0.2",
+          "bundled": true,
+          "requires": {
+            "array-uniq": "^1.0.1"
+          }
+        },
+        "array-uniq": {
+          "version": "1.0.3",
+          "bundled": true
+        },
+        "arrify": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "asn1": {
+          "version": "0.2.4",
+          "bundled": true,
+          "requires": {
+            "safer-buffer": "~2.1.0"
+          }
+        },
+        "asn1.js": {
+          "version": "4.10.1",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0"
+          }
+        },
+        "assert": {
+          "version": "1.4.1",
+          "bundled": true,
+          "requires": {
+            "util": "0.10.3"
+          },
+          "dependencies": {
+            "inherits": {
+              "version": "2.0.1",
+              "bundled": true
+            },
+            "util": {
+              "version": "0.10.3",
+              "bundled": true,
+              "requires": {
+                "inherits": "2.0.1"
+              }
+            }
+          }
+        },
+        "assert-plus": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "asynckit": {
+          "version": "0.4.0",
+          "bundled": true
+        },
+        "aws-sign2": {
+          "version": "0.7.0",
+          "bundled": true
+        },
+        "aws4": {
+          "version": "1.8.0",
+          "bundled": true
+        },
+        "babel-code-frame": {
+          "version": "6.26.0",
+          "bundled": true,
+          "requires": {
+            "chalk": "^1.1.3",
+            "esutils": "^2.0.2",
+            "js-tokens": "^3.0.2"
+          }
+        },
+        "balanced-match": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "base64-js": {
+          "version": "1.3.0",
+          "bundled": true
+        },
+        "bcrypt-pbkdf": {
+          "version": "1.0.2",
+          "bundled": true,
+          "requires": {
+            "tweetnacl": "^0.14.3"
+          }
+        },
+        "bind-obj-methods": {
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "bluebird": {
+          "version": "3.5.2",
+          "bundled": true
+        },
+        "bn.js": {
+          "version": "4.11.8",
+          "bundled": true
+        },
+        "brace-expansion": {
+          "version": "1.1.11",
+          "bundled": true,
+          "requires": {
+            "balanced-match": "^1.0.0",
+            "concat-map": "0.0.1"
+          }
+        },
+        "brorand": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "browser-pack": {
+          "version": "6.1.0",
+          "bundled": true,
+          "requires": {
+            "JSONStream": "^1.0.3",
+            "combine-source-map": "~0.8.0",
+            "defined": "^1.0.0",
+            "safe-buffer": "^5.1.1",
+            "through2": "^2.0.0",
+            "umd": "^3.0.0"
+          }
+        },
+        "browser-process-hrtime": {
+          "version": "0.1.3",
+          "bundled": true
+        },
+        "browser-resolve": {
+          "version": "1.11.3",
+          "bundled": true,
+          "requires": {
+            "resolve": "1.1.7"
+          },
+          "dependencies": {
+            "resolve": {
+              "version": "1.1.7",
+              "bundled": true
+            }
+          }
+        },
+        "browserify": {
+          "version": "16.2.3",
+          "bundled": true,
+          "requires": {
+            "JSONStream": "^1.0.3",
+            "assert": "^1.4.0",
+            "browser-pack": "^6.0.1",
+            "browser-resolve": "^1.11.0",
+            "browserify-zlib": "~0.2.0",
+            "buffer": "^5.0.2",
+            "cached-path-relative": "^1.0.0",
+            "concat-stream": "^1.6.0",
+            "console-browserify": "^1.1.0",
+            "constants-browserify": "~1.0.0",
+            "crypto-browserify": "^3.0.0",
+            "defined": "^1.0.0",
+            "deps-sort": "^2.0.0",
+            "domain-browser": "^1.2.0",
+            "duplexer2": "~0.1.2",
+            "events": "^2.0.0",
+            "glob": "^7.1.0",
+            "has": "^1.0.0",
+            "htmlescape": "^1.1.0",
+            "https-browserify": "^1.0.0",
+            "inherits": "~2.0.1",
+            "insert-module-globals": "^7.0.0",
+            "labeled-stream-splicer": "^2.0.0",
+            "mkdirp": "^0.5.0",
+            "module-deps": "^6.0.0",
+            "os-browserify": "~0.3.0",
+            "parents": "^1.0.1",
+            "path-browserify": "~0.0.0",
+            "process": "~0.11.0",
+            "punycode": "^1.3.2",
+            "querystring-es3": "~0.2.0",
+            "read-only-stream": "^2.0.0",
+            "readable-stream": "^2.0.2",
+            "resolve": "^1.1.4",
+            "shasum": "^1.0.0",
+            "shell-quote": "^1.6.1",
+            "stream-browserify": "^2.0.0",
+            "stream-http": "^2.0.0",
+            "string_decoder": "^1.1.1",
+            "subarg": "^1.0.0",
+            "syntax-error": "^1.1.1",
+            "through2": "^2.0.0",
+            "timers-browserify": "^1.0.1",
+            "tty-browserify": "0.0.1",
+            "url": "~0.11.0",
+            "util": "~0.10.1",
+            "vm-browserify": "^1.0.0",
+            "xtend": "^4.0.0"
+          },
+          "dependencies": {
+            "punycode": {
+              "version": "1.4.1",
+              "bundled": true
+            }
+          }
+        },
+        "browserify-aes": {
+          "version": "1.2.0",
+          "bundled": true,
+          "requires": {
+            "buffer-xor": "^1.0.3",
+            "cipher-base": "^1.0.0",
+            "create-hash": "^1.1.0",
+            "evp_bytestokey": "^1.0.3",
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
+          }
+        },
+        "browserify-cipher": {
+          "version": "1.0.1",
+          "bundled": true,
+          "requires": {
+            "browserify-aes": "^1.0.4",
+            "browserify-des": "^1.0.0",
+            "evp_bytestokey": "^1.0.0"
+          }
+        },
+        "browserify-des": {
+          "version": "1.0.2",
+          "bundled": true,
+          "requires": {
+            "cipher-base": "^1.0.1",
+            "des.js": "^1.0.0",
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.1.2"
+          }
+        },
+        "browserify-rsa": {
+          "version": "4.0.1",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.1.0",
+            "randombytes": "^2.0.1"
+          }
+        },
+        "browserify-sign": {
+          "version": "4.0.4",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.1.1",
+            "browserify-rsa": "^4.0.0",
+            "create-hash": "^1.1.0",
+            "create-hmac": "^1.1.2",
+            "elliptic": "^6.0.0",
+            "inherits": "^2.0.1",
+            "parse-asn1": "^5.0.0"
+          }
+        },
+        "browserify-zlib": {
+          "version": "0.2.0",
+          "bundled": true,
+          "requires": {
+            "pako": "~1.0.5"
+          }
+        },
+        "buffer": {
+          "version": "5.2.1",
+          "bundled": true,
+          "requires": {
+            "base64-js": "^1.0.2",
+            "ieee754": "^1.1.4"
+          }
+        },
+        "buffer-from": {
+          "version": "1.1.1",
+          "bundled": true
+        },
+        "buffer-xor": {
+          "version": "1.0.3",
+          "bundled": true
+        },
+        "builtin-modules": {
+          "version": "1.1.1",
+          "bundled": true
+        },
+        "builtin-status-codes": {
+          "version": "3.0.0",
+          "bundled": true
+        },
+        "cached-path-relative": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "caller-path": {
+          "version": "0.1.0",
+          "bundled": true,
+          "requires": {
+            "callsites": "^0.2.0"
+          }
+        },
+        "callsites": {
+          "version": "0.2.0",
+          "bundled": true
+        },
+        "camel-case": {
+          "version": "3.0.0",
+          "bundled": true,
+          "requires": {
+            "no-case": "^2.2.0",
+            "upper-case": "^1.1.1"
+          }
+        },
+        "caseless": {
+          "version": "0.12.0",
+          "bundled": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "bundled": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "chardet": {
+          "version": "0.4.2",
+          "bundled": true
+        },
+        "cipher-base": {
+          "version": "1.0.4",
+          "bundled": true,
+          "requires": {
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
+          }
+        },
+        "circular-json": {
+          "version": "0.3.3",
+          "bundled": true
+        },
+        "clean-yaml-object": {
+          "version": "0.1.0",
+          "bundled": true
+        },
+        "cli-cursor": {
+          "version": "2.1.0",
+          "bundled": true,
+          "requires": {
+            "restore-cursor": "^2.0.0"
+          }
+        },
+        "cli-width": {
+          "version": "2.2.0",
+          "bundled": true
+        },
+        "co": {
+          "version": "4.6.0",
+          "bundled": true
+        },
+        "code-point-at": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "color-convert": {
+          "version": "1.9.3",
+          "bundled": true,
+          "requires": {
+            "color-name": "1.1.3"
+          }
+        },
+        "color-name": {
+          "version": "1.1.3",
+          "bundled": true
+        },
+        "color-support": {
+          "version": "1.1.3",
+          "bundled": true
+        },
+        "combine-source-map": {
+          "version": "0.8.0",
+          "bundled": true,
+          "requires": {
+            "convert-source-map": "~1.1.0",
+            "inline-source-map": "~0.6.0",
+            "lodash.memoize": "~3.0.3",
+            "source-map": "~0.5.3"
+          }
+        },
+        "combined-stream": {
+          "version": "1.0.7",
+          "bundled": true,
+          "requires": {
+            "delayed-stream": "~1.0.0"
+          }
+        },
+        "concat-map": {
+          "version": "0.0.1",
+          "bundled": true
+        },
+        "concat-stream": {
+          "version": "1.6.2",
+          "bundled": true,
+          "requires": {
+            "buffer-from": "^1.0.0",
+            "inherits": "^2.0.3",
+            "readable-stream": "^2.2.2",
+            "typedarray": "^0.0.6"
+          }
+        },
+        "console-browserify": {
+          "version": "1.1.0",
+          "bundled": true,
+          "requires": {
+            "date-now": "^0.1.4"
+          }
+        },
+        "constants-browserify": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "contains-path": {
+          "version": "0.1.0",
+          "bundled": true
+        },
+        "convert-source-map": {
+          "version": "1.1.3",
+          "bundled": true
+        },
+        "core-util-is": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "coveralls": {
+          "version": "3.0.2",
+          "bundled": true,
+          "requires": {
+            "growl": "~> 1.10.0",
+            "js-yaml": "^3.11.0",
+            "lcov-parse": "^0.0.10",
+            "log-driver": "^1.2.7",
+            "minimist": "^1.2.0",
+            "request": "^2.85.0"
+          }
+        },
+        "create-ecdh": {
+          "version": "4.0.3",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.1.0",
+            "elliptic": "^6.0.0"
+          }
+        },
+        "create-hash": {
+          "version": "1.2.0",
+          "bundled": true,
+          "requires": {
+            "cipher-base": "^1.0.1",
+            "inherits": "^2.0.1",
+            "md5.js": "^1.3.4",
+            "ripemd160": "^2.0.1",
+            "sha.js": "^2.4.0"
+          }
+        },
+        "create-hmac": {
+          "version": "1.1.7",
+          "bundled": true,
+          "requires": {
+            "cipher-base": "^1.0.3",
+            "create-hash": "^1.1.0",
+            "inherits": "^2.0.1",
+            "ripemd160": "^2.0.0",
+            "safe-buffer": "^5.0.1",
+            "sha.js": "^2.4.8"
+          }
+        },
+        "cross-spawn": {
+          "version": "6.0.5",
+          "bundled": true,
+          "requires": {
+            "nice-try": "^1.0.4",
+            "path-key": "^2.0.1",
+            "semver": "^5.5.0",
+            "shebang-command": "^1.2.0",
+            "which": "^1.2.9"
+          }
+        },
+        "crypto-browserify": {
+          "version": "3.12.0",
+          "bundled": true,
+          "requires": {
+            "browserify-cipher": "^1.0.0",
+            "browserify-sign": "^4.0.0",
+            "create-ecdh": "^4.0.0",
+            "create-hash": "^1.1.0",
+            "create-hmac": "^1.1.0",
+            "diffie-hellman": "^5.0.0",
+            "inherits": "^2.0.1",
+            "pbkdf2": "^3.0.3",
+            "public-encrypt": "^4.0.0",
+            "randombytes": "^2.0.0",
+            "randomfill": "^1.0.3"
+          }
+        },
+        "d3-array": {
+          "version": "1.2.4",
+          "bundled": true
+        },
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+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      }
+    },
+    "strip-ansi": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+      "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+      "requires": {
+        "ansi-regex": "^3.0.0"
+      }
+    },
+    "supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "requires": {
+        "has-flag": "^3.0.0"
+      }
+    },
+    "table": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.1.0.tgz",
+      "integrity": "sha512-e542in22ZLhD/fOIuXs/8yDZ9W61ltF8daM88rkRNtgTIct+vI2fTnAyu/Db2TCfEcI8i7mjZz6meLq0nW7TYg==",
+      "requires": {
+        "ajv": "^6.5.3",
+        "lodash": "^4.17.10",
+        "slice-ansi": "1.0.0",
+        "string-width": "^2.1.1"
+      }
+    },
+    "timestring": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/timestring/-/timestring-5.0.1.tgz",
+      "integrity": "sha512-0VfOVpaTYqBMTEpjwcY5mB+72YYjFI44Z5F2q80ZiIyDn5pRJm+rEV1OEM8xfnf5/FdtckcrTERTp9TbrlMMHw=="
+    },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
+    },
+    "type-is": {
+      "version": "1.6.16",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
+      "integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.18"
+      }
+    },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
+    "urijs": {
+      "version": "1.19.1",
+      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.1.tgz",
+      "integrity": "sha512-xVrGVi94ueCJNrBSTjWqjvtgvl3cyOTThp2zaMaFNGp3F542TR6sM3f2o8RqZl+AwteClSVmoCyt0ka4RjQOQg=="
+    },
+    "uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
+    },
+    "uuid-parse": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/uuid-parse/-/uuid-parse-1.0.0.tgz",
+      "integrity": "sha1-9GV3F2JLDkuIrzb5jYlYmlu+5Wk="
+    },
+    "v8-profiler-next": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/v8-profiler-next/-/v8-profiler-next-1.0.0.tgz",
+      "integrity": "sha512-0RB2pymFwCYJTMhZbYteGHg4puCfYvStjdiqKlaDs4Uyet+A1mgr3wpz21SVGwszljZIcJRQHNsd2UC4HyJa7Q==",
+      "requires": {
+        "nan": "^2.10.0"
+      }
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
+    "ylru": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ylru/-/ylru-1.2.1.tgz",
+      "integrity": "sha512-faQrqNMzcPCHGVC2aaOINk13K+aaBDUPjGWl0teOXywElLjyVAB6Oe2jj62jHYtwsU49jXhScYbvPENK+6zAvQ=="
+    }
+  }
+}
diff --git a/examples/v8-profiler/package.json b/examples/v8-profiler/package.json
new file mode 100644
index 0000000..ef57fc8
--- /dev/null
+++ b/examples/v8-profiler/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "0x-visualize-v8-profile-example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "./test.sh",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "0x": "file:../../",
+    "autocannon": "^3.1.0",
+    "koa": "^2.6.1",
+    "koa-router": "^7.4.0",
+    "v8-profiler-next": "^1.0.0"
+  }
+}
diff --git a/examples/v8-profiler/test.sh b/examples/v8-profiler/test.sh
new file mode 100755
index 0000000..4b16b2b
--- /dev/null
+++ b/examples/v8-profiler/test.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+node index.js &
+first_pid=$!
+
+sleep 1
+
+curl -v http://localhost:3000/start-profiling
+
+node node_modules/.bin/autocannon -l -R 200000 -c 2000 -d 20 http://localhost:3000
+
+curl -v http://localhost:3000/stop-profiling
+
+sleep 3
+kill -KILL $first_pid
+
+node node_modules/.bin/0x --visualize-v8-profile v8-profile.json
diff --git a/lib/convert-v8-profile-to-tree.js b/lib/convert-v8-profile-to-tree.js
index 3082667..d860e0e 100644
--- a/lib/convert-v8-profile-to-tree.js
+++ b/lib/convert-v8-profile-to-tree.js
@@ -1,28 +1,30 @@
+'use strict'
+
 function convert (profile) {
   const converted = {
     children: new Array(profile.children.length),
     name: `${profile.functionName} ${profile.url}:${profile.lineNumber}`,
     top: profile.hitCount,
     value: profile.hitCount,
-    S: 0,
+    S: 0
   }
 
   for (let i = 0; i < profile.children.length; i++) {
-    converted.children[i] = convert(profile.children[i]);
-    converted.value += converted.children[i].value;
+    converted.children[i] = convert(profile.children[i])
+    converted.value += converted.children[i].value
   }
 
-  return converted;
+  return converted
 }
 
 function convertV8Profile (profile) {
-  const converted = convert(profile)
+  const converted = convert(profile.head)
   return {
     merged: converted,
-    unmerged: converted,
+    unmerged: converted
   }
 }
 
 module.exports = {
-  convertV8Profile,
+  convertV8Profile
 }
diff --git a/lib/render.js b/lib/render.js
index fc74dba..795979a 100644
--- a/lib/render.js
+++ b/lib/render.js
@@ -22,7 +22,7 @@ async function render (opts) {
   let trees
   if (visualizeV8Profile) {
     const v8Profile = require(path.resolve(workingDir, visualizeV8Profile))
-    trees = convertV8Profile(v8Profile.head)
+    trees = convertV8Profile(v8Profile)
   } else {
     trees = ticksToTree(ticks, { mapFrames, inlined, pathToNodeBinary })
   }
diff --git a/readme.md b/readme.md
index 43bc298..b443be8 100644
--- a/readme.md
+++ b/readme.md
@@ -16,7 +16,7 @@ on any platform which Node runs on (macOs, Linux, Windows, Android...).
 * Node v8.5.0 and above
 * Default usage supports any Operating System that Node runs on!
 * Chrome
-  * Other browsers may open flamegraphs in a degraded, but functional form 
+  * Other browsers may open flamegraphs in a degraded, but functional form
 
 ## Legacy
 
@@ -82,12 +82,12 @@ generates a profile folder (`<pid>.0x`), containing `flamegraph.html`.
 
 ## The UI
 
-The `flamegraph.html` file contains the 0x UI, which is explained in 
+The `flamegraph.html` file contains the 0x UI, which is explained in
 [docs/ui.md](docs/ui.md).
 
 ## Production Servers
 
-A lightweight, production server friendly, approach to generating a 
+A lightweight, production server friendly, approach to generating a
 flamegraph is described in [docs/production-servers.md](docs/production-servers.md).
 
 ## The Profile Folder
@@ -125,30 +125,30 @@ Print usage info.
 Open the flamegraph in the browser using `open` or `xdg-open` (see
 https://www.npmjs.com/package/open for details).
 
-### --on-port | -P          
+### --on-port | -P
 
-Run a given command and then generate the flamegraph. 
-The command as specified has access to a `$PORT` variable. 
-The `$PORT` variable is set according to the first port that 
-profiled process opens. 
+Run a given command and then generate the flamegraph.
+The command as specified has access to a `$PORT` variable.
+The `$PORT` variable is set according to the first port that
+profiled process opens.
 
-For instance, here's an example of using [autocannon](http://npm.im/autocannon) 
+For instance, here's an example of using [autocannon](http://npm.im/autocannon)
 to load-test the process:
 
 ```sh
 0x -P 'autocannon localhost:$PORT' app.js
 ```
 
-When the load-test completes, the profiled processed will be 
-sent a SIGINT and the flamegraph will be automatically generated.  
+When the load-test completes, the profiled processed will be
+sent a SIGINT and the flamegraph will be automatically generated.
 
 Remember to use single quotes to avoid bash interpolation,
 or else escape variable (e.g. `0x -P "autocannon localhost:$PORT" app.js`
 won't work wheras `0x -P "autocannon localhost:\$PORT" app.js` will).
 
 Note: On Windows interpolation usually occurs with `%PORT%`, however
-in this case the dollar-prefix `$PORT` is the correct syntax 
-(because the interpolation is not shell based). 
+in this case the dollar-prefix `$PORT` is the correct syntax
+(because the interpolation is not shell based).
 
 Default: ''
 
@@ -156,24 +156,24 @@ Default: ''
 
 The name of the HTML file, without the .html extension
 Can be set to - to write HTML to STDOUT (note
-due to the nature of CLI argument parsing, this must be set using `=`, 
+due to the nature of CLI argument parsing, this must be set using `=`,
 e.g. `--name=-`).
 
-If either this flag or `--output-html-file` is set to `-` 
+If either this flag or `--output-html-file` is set to `-`
 then the HTML will go to STDOUT.
 
 Default: flamegraph
 
-### ---title 
+### ---title
 
 Set the title to display in the flamegraph UI.
 
-Default: the command that 0x ran to start the process 
+Default: the command that 0x ran to start the process
 
 ### --output-dir | -D
 
 Specify artifact output directory. This can be specified in template
-form with possible variables being `{pid}`, `{timestamp}`, `{name}` 
+form with possible variables being `{pid}`, `{timestamp}`, `{name}`
 (based on the `--name` flag) and `{outputDir}`(variables
 must be specified without whitespace, e.g. `{ pid }` is not supported).
 
@@ -181,34 +181,34 @@ Default: `{pid}.0x`
 
 ### --output-html | -F
 
-Specify destination of the generated flamegraph HTML file. 
-This can be specified in template form with possible variables 
-being `{pid}`, `{timestamp}`, `{name}` (based on the `--name` flag) and 
-`{outputDir}` (variables must be specified without whitespace, 
-e.g. `{ pid }` is not supported). It can also be set to `-` to 
+Specify destination of the generated flamegraph HTML file.
+This can be specified in template form with possible variables
+being `{pid}`, `{timestamp}`, `{name}` (based on the `--name` flag) and
+`{outputDir}` (variables must be specified without whitespace,
+e.g. `{ pid }` is not supported). It can also be set to `-` to
 send the HTML output to STDOUT (note
-due to the nature of CLI argument parsing, this must be set using `=`, 
+due to the nature of CLI argument parsing, this must be set using `=`,
 e.g. `--output-html=-`).
 
-If either this flag or `--name` is set to `-` 
+If either this flag or `--name` is set to `-`
 then the HTML will go to STDOUT.
 
 Default: `{outputDir}/{name}.html`
 
 ### --kernel-tracing
 
-Use an OS kernel tracing tool (perf on Linux or 
-dtrace on macOS and SmartOS). This will capture 
-native stack frames (C++ modules and Libuv I/O), 
+Use an OS kernel tracing tool (perf on Linux or
+dtrace on macOS and SmartOS). This will capture
+native stack frames (C++ modules and Libuv I/O),
 but may result in missing stacks on Node 8.
 
 See [docs/kernel-tracing.md](docs/kernel-tracing.md) for more information.
 
-Default: false 
+Default: false
 
-### --quiet | -q 
+### --quiet | -q
 
-Limit output, the only output will be fatal errors or 
+Limit output, the only output will be fatal errors or
 the path to the `flamegraph.html` upon successful generation.
 
 Default: false
@@ -226,13 +226,22 @@ with relevant outputs.
 
 Default: false
 
-### --visualize-only 
+### --visualize-only
 
-Supply a path to a profile folder to build or rebuild visualization 
+Supply a path to a profile folder to build or rebuild visualization
 from original stacks.
 
 Default: undefined
 
+### --visualize-v8-profile
+
+Supply a path to a profile recorded by
+[v8-profiler](https://github.com/node-inspector/v8-profiler)
+or [v8-profiler-next](https://github.com/hyj1991/v8-profiler-next) to build a
+flamegraph. See `examples/v8-profiler` for an example.
+
+Default: undefined
+
 ### --kernel-tracing-debug
 
 Show output from DTrace or perf(1) tools.
@@ -246,7 +255,7 @@ file.
 
 Default: false
 
-## Programmatic API 
+## Programmatic API
 
 0x can also be required as a Node module and scripted:
 
@@ -277,9 +286,9 @@ The Programmatic API is detailed in [docs/api.md](docs/api.md).
 
 ### Memory Issues
 
-Very complex applications with lots of stacks may hit memory issues. 
+Very complex applications with lots of stacks may hit memory issues.
 
-The `--stack-size` flag can be used to set the memory to the maximum 8GB 
+The `--stack-size` flag can be used to set the memory to the maximum 8GB
 in order to work around this when profiling:
 
 ```
@@ -288,7 +297,7 @@ node --stack-size=8024 $(which 0x) my-app.js
 
 There may still be a problem opening the flamegraph in Chrome. The same work
 around can be used by opening Chrome from the command line (platform dependent)
-and nesting the `--stack-size` flag within the `--js-flags` flag: 
+and nesting the `--stack-size` flag within the `--js-flags` flag:
 `--js-flags="--stack-size 8024"`.
 
 ## Debugging
@@ -306,7 +315,7 @@ and nesting the `--stack-size` flag within the `--js-flags` flag:
 Sponsored by [nearForm](http://nearform.com)
 
 This tool is inspired from various info and code sources
-and would have taken much longer without the following people and 
+and would have taken much longer without the following people and
 their Open Source/Info Sharing efforts:
 
 * Thorsten Lorenz (<http://thlorenz.com/>)
diff --git a/test/convert-v9-profile-to-tree.test.js b/test/convert-v9-profile-to-tree.test.js
new file mode 100644
index 0000000..971cd2d
--- /dev/null
+++ b/test/convert-v9-profile-to-tree.test.js
@@ -0,0 +1,95 @@
+const { test } = require('tap')
+const { convertV8Profile } = require('../lib/convert-v8-profile-to-tree')
+
+const exampleProfile = {
+  'typeId': 'CPU',
+  'uid': '1',
+  'title': 'p1',
+  'head': {
+    'functionName': '(root)',
+    'url': '',
+    'lineNumber': 0,
+    'callUID': 243,
+    'bailoutReason': '',
+    'id': 1,
+    'scriptId': 0,
+    'hitCount': 0,
+    'children': [
+      {
+        'functionName': 'first_function',
+        'url': 'one.js',
+        'lineNumber': 64,
+        'callUID': 107,
+        'bailoutReason': 'no reason',
+        'id': 2,
+        'scriptId': 1,
+        'hitCount': 0,
+        'children': [
+          {
+            'functionName': 'second_function',
+            'url': 'two.js',
+            'lineNumber': 64,
+            'callUID': 107,
+            'bailoutReason': 'no reason',
+            'id': 2,
+            'scriptId': 2,
+            'hitCount': 3,
+            'children': []
+          }, {
+            'functionName': 'second_function',
+            'url': 'two.js',
+            'lineNumber': 64,
+            'callUID': 107,
+            'bailoutReason': 'no reason',
+            'id': 2,
+            'scriptId': 3,
+            'hitCount': 7,
+            'children': []
+          }
+        ]
+      }
+    ]
+  }
+}
+
+const _expected = {
+  'children': [
+    {
+      'children': [
+        {
+          'children': [],
+          'name': 'second_function two.js:64',
+          'top': 3,
+          'value': 3,
+          'S': 0
+        },
+        {
+          'children': [],
+          'name': 'second_function two.js:64',
+          'top': 7,
+          'value': 7,
+          'S': 0
+        }
+      ],
+      'name': 'first_function one.js:64',
+      'top': 0,
+      'value': 10,
+      'S': 0
+    }
+  ],
+  'name': '(root) :0',
+  'top': 0,
+  'value': 10,
+  'S': 0
+}
+
+const expected = {
+  'merged': _expected,
+  'unmerged': _expected
+}
+
+test('v8 profile converter works', function (t) {
+  const result = convertV8Profile(exampleProfile)
+  t.same(result, expected)
+  t.end()
+})