diff --git a/2023/day-01/checksum.js b/2023/day-01/checksum.js
new file mode 100644
index 0000000..4309267
--- /dev/null
+++ b/2023/day-01/checksum.js
@@ -0,0 +1,117 @@
+/**
+ * Generates a checksum for a string by concatenating
+ * the first and last digits found in the string
+ * @param {string} data of a single line
+ */
+const checksumLine = (data) => {
+  const parsed = data.replaceAll(/([^0-9])/g, '') // trim non-numeric characters
+  let result = ''
+  if (parsed.length === 1) { // some strings only have a single digit
+    result = `${parsed}${parsed}`
+  } else {
+    result = `${parsed[0]}${parsed[parsed.length - 1]}`
+  }
+  return parseInt(result)
+}
+
+const lazyNums = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+const lazyReg = new RegExp(lazyNums.join('|'))
+const lazyNumsReversed = lazyNums.map((num) => num.split('').reverse().join(''))
+const lazyReversReg = new RegExp(lazyNumsReversed.join('|'))
+
+const lookupPosition = (match) => {
+  const idx = lazyNums.indexOf(match)
+  if (idx > 9) {
+    return idx - 9
+  }
+  return idx
+}
+
+const lookupPositionReversed = (match) => {
+  const reverseMatch = match.split('').reverse().join('')
+  const idx = lazyNums.indexOf(reverseMatch)
+  if (idx > 9) {
+    return idx - 9
+  }
+  return idx
+}
+
+const lazyChecksumLine = (data) => {
+  let first = ''
+  data.replace(lazyReg, (match) => {
+    first = lookupPosition(match)
+    return match // reinsert so we don't bork the data string
+  })
+  // find last matching digit by reversing the string and searching backwards
+  let last = ''
+  data = data.split('').reverse().join('')
+  data.replace(lazyReversReg, (match) => {
+    last = lookupPositionReversed(match)
+    return match // reinsert so we don't bork the data string
+  })
+
+  return parseInt(`${first}${last}`)
+}
+
+/**
+ * Generates the checksum for an entire set
+ * @param {array} set of lines containing data
+ */
+const checksumSet = (set, sanitize = false, lazy = false) => {
+  let filter = (data) => data
+  if (sanitize) {
+    filter = sanitizeLine
+  }
+
+  let checksum = checksumLine
+  if (lazy) {
+    checksum = lazyChecksumLine
+  }
+
+  return set.reduce((total, current) => {
+    return total + checksum(
+      filter(current)
+    )
+  }, 0)
+}
+
+const numbers = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+const numbersReversed = numbers.map((num) => num.split('').reverse().join(''))
+const reg = new RegExp(numbers.join('|'))
+const regGlobal = new RegExp(numbers.join('|'), 'g')
+const regReversed = new RegExp(numbersReversed.join('|'))
+
+// Sanitizes using a single-pass regex replace all
+// Produces 53885 which is incorrect for part 2
+const byRegex = (data) => {
+  return data.replaceAll(regGlobal, (matched) => numbers.indexOf(matched) + 1)
+}
+
+// Sanitizes by replacing just the first and last text digits, in case shared letters is supposed to work
+// Produces 53853 which is too low for part 2
+const byFirstLast = (data) => {
+  // sanitize first matching digit
+  data = data.replace(reg, (matched) => numbers.indexOf(matched) + 1)
+  // sanitize last matching digit by reversing the string and searching backwards
+  data = data.split('').reverse().join('')
+  data = data.replace(regReversed, (matched) => numbersReversed.indexOf(matched) + 1)
+
+  // return original order
+  return data.split('').reverse().join('')
+}
+
+/**
+ * Sanitzizes a line by replacing spelled-out numbers with data
+ * @param {string} data line of input to sanitize
+ */
+const sanitizeLine = (data, method = 'byFirstLast') => {
+  const methods = {
+    none: (data) => data,
+    byFirstLast,
+    byRegex
+  }
+
+  return methods[method](data)
+}
+
+module.exports = { checksumLine, checksumSet, sanitizeLine, lazyChecksumLine }
diff --git a/2023/day-01/checksum.test.js b/2023/day-01/checksum.test.js
new file mode 100644
index 0000000..72b2060
--- /dev/null
+++ b/2023/day-01/checksum.test.js
@@ -0,0 +1,122 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { checksumSet, checksumLine, sanitizeLine, lazyChecksumLine } = require('./checksum')
+const fs = require('fs')
+const path = require('path')
+const filePath = path.join(__dirname, 'input.txt')
+const { inputToArray } = require('../../2018/inputParser')
+
+describe('--- Day 1: Trebuchet?! ---', () => {
+  describe('Part 1', () => {
+    describe('checksum', () => {
+      it('calculates the checksum for a string by concatentating the first and last number', () => {
+        // provided
+        expect(checksumLine('1abc2')).to.equal(12)
+        expect(checksumLine('pqr3stu8vwx')).to.equal(38)
+        expect(checksumLine('a1b2c3d4e5f')).to.equal(15)
+      })
+      it('handles the edge case of a line with only a single digit', () => {
+        // provided
+        expect(checksumLine('treb7uchet')).to.equal(77)
+      })
+    })
+    describe('checksumSet', () => {
+      it('calculates the checksum for a set of lines by summing the checksum of each line', () => {
+        // provided
+        const set = ['1abc2', 'pqr3stu8vwx', 'a1b2c3d4e5f', 'treb7uchet']
+        expect(checksumSet(set)).to.equal(142)
+      })
+    })
+  })
+  describe('Part 2', () => {
+    describe('sanitizeLine', () => {
+      const data = [
+        'two1nine',
+        'eightwothree',
+        'abcone2threexyz',
+        'xtwone3four',
+        '4nineeightseven2',
+        'zoneight234',
+        '7pqrstsixteen'
+      ]
+      const result = [29, 83, 13, 24, 42, 14, 76]
+      it('cleans up a string when digits are spelled out', () => {
+        const set = JSON.parse(JSON.stringify(data))
+        for (let x = 0; x < set.length; x++) {
+          expect(checksumLine(sanitizeLine(set[x]))).to.equal(result[x])
+          // expect(checksumLine(sanitizeLine(set[x], 'sanitizeByRegex'))).to.equal(result[x])
+          // expect(checksumLine(sanitizeLine(set[x], 'sanitizeFirstLast'))).to.equal(result[x])
+        }
+      })
+      it('allows for skipping sanitation', () => {
+        const set = JSON.parse(JSON.stringify(data))
+        for (let x = 0; x < set.length; x++) {
+          expect(sanitizeLine(set[x], 'none')).to.equal(data[x])
+        }
+      })
+    })
+    describe('checksumSet', () => {
+      const data = [
+        'two1nine',
+        'eightwothree',
+        'abcone2threexyz',
+        'xtwone3four',
+        '4nineeightseven2',
+        'zoneight234',
+        '7pqrstsixteen'
+      ]
+      it('can sanitize', () => {
+        expect(checksumSet(data, true)).to.equal(281)
+      })
+    })
+    describe('lazyChecksumLine', () => {
+      const data = [
+        'two1nine',
+        'eightwothree',
+        'abcone2threexyz',
+        'xtwone3four',
+        '4nineeightseven2',
+        'zoneight234',
+        '7pqrstsixteen'
+      ]
+      const result = [29, 83, 13, 24, 42, 14, 76]
+      it('can match text or numeric for checksum calcs', () => {
+        const set = JSON.parse(JSON.stringify(data))
+        for (let x = 0; x < set.length; x++) {
+          expect(lazyChecksumLine(set[x])).to.equal(result[x])
+        }
+      })
+    })
+
+    describe.skip('integeration', () => {
+      let initData
+      before((done) => {
+        fs.readFile(filePath, { encoding: 'utf8' }, (err, rawData) => {
+          if (err) throw err
+          initData = inputToArray(rawData.trim())
+          // Deep copy to ensure we aren't mutating the original data
+          // data = JSON.parse(JSON.stringify(initData))
+          done()
+        })
+      })
+
+      it('is not done without sanitation, since that matches part 1', () => {
+        const data = JSON.parse(JSON.stringify(initData))
+        const result = checksumSet(data, false, true)
+        expect(result).to.not.equal(54953)
+      })
+
+      it('is not done with a one-time regex', () => {
+        const data = JSON.parse(JSON.stringify(initData))
+        const result = checksumSet(data, false, true)
+        expect(result).to.not.equal(53885) // result of one-time regex
+      })
+
+      it('is not done by sanitizing just the first and last strings', () => {
+        const data = JSON.parse(JSON.stringify(initData))
+        const result = checksumSet(data, false, true)
+        expect(result).to.not.equal(53853) // result of first/last substitution onlye
+      })
+    })
+  })
+})
diff --git a/2023/day-01/index.js b/2023/day-01/index.js
new file mode 100644
index 0000000..af7e035
--- /dev/null
+++ b/2023/day-01/index.js
@@ -0,0 +1,3 @@
+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')
diff --git a/2023/day-01/input.txt b/2023/day-01/input.txt
new file mode 100644
index 0000000..446fab4
--- /dev/null
+++ b/2023/day-01/input.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/2023/day-01/solution.js b/2023/day-01/solution.js
new file mode 100644
index 0000000..763869e
--- /dev/null
+++ b/2023/day-01/solution.js
@@ -0,0 +1,34 @@
+const fs = require('fs')
+const path = require('path')
+const filePath = path.join(__dirname, 'input.txt')
+const { inputToArray } = require('../../2018/inputParser')
+const { checksumSet } = require('./checksum')
+
+fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => {
+  if (err) throw err
+
+  initData = inputToArray(initData.trim())
+
+  const resetInput = () => {
+    // Deep copy to ensure we aren't mutating the original data
+    return JSON.parse(JSON.stringify(initData))
+  }
+
+  const part1 = () => {
+    const data = resetInput()
+    return checksumSet(data)
+  }
+
+  const part2 = () => {
+    const data = resetInput()
+    return checksumSet(data, false, true)
+  }
+  const answers = []
+  answers.push(part1())
+  answers.push(part2())
+
+  answers.forEach((ans, idx) => {
+    console.info(`-- Part ${idx + 1} --`)
+    console.info(`Answer: ${ans}`)
+  })
+})
diff --git a/index.js b/index.js
index 39627a9..a1611a7 100644
--- a/index.js
+++ b/index.js
@@ -1 +1 @@
-require('./2022/day-02/solution')
+require('./2023/day-01/solution')