diff --git a/std/fmt/colors.ts b/std/fmt/colors.ts
index c37f07d1bc..6c986711dc 100644
--- a/std/fmt/colors.ts
+++ b/std/fmt/colors.ts
@@ -29,7 +29,10 @@ interface Rgb {
 
 let enabled = !noColor;
 
-/** Set changing text color to enabled or disabled */
+/**
+ * Set changing text color to enabled or disabled
+ * @param value
+ */
 export function setColorEnabled(value: boolean): void {
   if (noColor) {
     return;
@@ -38,11 +41,16 @@ export function setColorEnabled(value: boolean): void {
   enabled = value;
 }
 
-/** Get wheather text color change is enabled or disabled. */
+/** Get whether text color change is enabled or disabled. */
 export function getColorEnabled(): boolean {
   return enabled;
 }
 
+/**
+ * Builds color code
+ * @param open
+ * @param close
+ */
 function code(open: number[], close: number): Code {
   return {
     open: `\x1b[${open.join(";")}m`,
@@ -51,236 +59,379 @@ function code(open: number[], close: number): Code {
   };
 }
 
+/**
+ * Applies color and background based on color code and its associated text
+ * @param str text to apply color settings to
+ * @param code color code to apply
+ */
 function run(str: string, code: Code): string {
   return enabled
     ? `${code.open}${str.replace(code.regexp, code.open)}${code.close}`
     : str;
 }
 
-/** Reset the text modified */
+/**
+ * Reset the text modified
+ * @param str text to reset
+ */
 export function reset(str: string): string {
   return run(str, code([0], 0));
 }
 
-/** Make the text bold. */
+/**
+ * Make the text bold.
+ * @param str text to make bold
+ */
 export function bold(str: string): string {
   return run(str, code([1], 22));
 }
 
-/** The text emits only a small amount of light. */
+/**
+ * The text emits only a small amount of light.
+ * @param str text to dim
+ */
 export function dim(str: string): string {
   return run(str, code([2], 22));
 }
 
-/** Make the text italic. */
+/**
+ * Make the text italic.
+ * @param str text to make italic
+ */
 export function italic(str: string): string {
   return run(str, code([3], 23));
 }
 
-/** Make the text underline. */
+/**
+ * Make the text underline.
+ * @param str text to underline
+ */
 export function underline(str: string): string {
   return run(str, code([4], 24));
 }
 
-/** Invert background color and text color. */
+/**
+ * Invert background color and text color.
+ * @param str text to invert its color
+ */
 export function inverse(str: string): string {
   return run(str, code([7], 27));
 }
 
-/** Make the text hidden. */
+/**
+ * Make the text hidden.
+ * @param str text to hide
+ */
 export function hidden(str: string): string {
   return run(str, code([8], 28));
 }
 
-/** Put horizontal line throught the center of the text. */
+/**
+ * Put horizontal line through the center of the text.
+ * @param str text to strike through
+ */
 export function strikethrough(str: string): string {
   return run(str, code([9], 29));
 }
 
-/** Set text color to black. */
+/**
+ * Set text color to black.
+ * @param str text to make black
+ */
 export function black(str: string): string {
   return run(str, code([30], 39));
 }
 
-/** Set text color to red. */
+/**
+ * Set text color to red.
+ * @param str text to make red
+ */
 export function red(str: string): string {
   return run(str, code([31], 39));
 }
 
-/** Set text color to green. */
+/**
+ * Set text color to green.
+ * @param str text to make green
+ */
 export function green(str: string): string {
   return run(str, code([32], 39));
 }
 
-/** Set text color to yellow. */
+/**
+ * Set text color to yellow.
+ * @param str text to make yellow
+ */
 export function yellow(str: string): string {
   return run(str, code([33], 39));
 }
 
-/** Set text color to blue. */
+/**
+ * Set text color to blue.
+ * @param str text to make blue
+ */
 export function blue(str: string): string {
   return run(str, code([34], 39));
 }
 
-/** Set text color to magenta. */
+/**
+ * Set text color to magenta.
+ * @param str text to make magenta
+ */
 export function magenta(str: string): string {
   return run(str, code([35], 39));
 }
 
-/** Set text color to cyan. */
+/**
+ * Set text color to cyan.
+ * @param str text to make cyan
+ */
 export function cyan(str: string): string {
   return run(str, code([36], 39));
 }
 
-/** Set text color to white. */
+/**
+ * Set text color to white.
+ * @param str text to make white
+ */
 export function white(str: string): string {
   return run(str, code([37], 39));
 }
 
-/** Set text color to gray. */
+/**
+ * Set text color to gray.
+ * @param str text to make gray
+ */
 export function gray(str: string): string {
   return brightBlack(str);
 }
 
-/** Set text color to bright black. */
+/**
+ * Set text color to bright black.
+ * @param str text to make bright-black
+ */
 export function brightBlack(str: string): string {
   return run(str, code([90], 39));
 }
 
-/** Set text color to bright red. */
+/**
+ * Set text color to bright red.
+ * @param str text to make bright-red
+ */
 export function brightRed(str: string): string {
   return run(str, code([91], 39));
 }
 
-/** Set text color to bright green. */
+/**
+ * Set text color to bright green.
+ * @param str text to make bright-green
+ */
 export function brightGreen(str: string): string {
   return run(str, code([92], 39));
 }
 
-/** Set text color to bright yellow. */
+/**
+ * Set text color to bright yellow.
+ * @param str text to make bright-yellow
+ */
 export function brightYellow(str: string): string {
   return run(str, code([93], 39));
 }
 
-/** Set text color to bright blue. */
+/**
+ * Set text color to bright blue.
+ * @param str text to make bright-blue
+ */
 export function brightBlue(str: string): string {
   return run(str, code([94], 39));
 }
 
-/** Set text color to bright magenta. */
+/**
+ * Set text color to bright magenta.
+ * @param str text to make bright-magenta
+ */
 export function brightMagenta(str: string): string {
   return run(str, code([95], 39));
 }
 
-/** Set text color to bright cyan. */
+/**
+ * Set text color to bright cyan.
+ * @param str text to make bright-cyan
+ */
 export function brightCyan(str: string): string {
   return run(str, code([96], 39));
 }
 
-/** Set text color to bright white. */
+/**
+ * Set text color to bright white.
+ * @param str text to make bright-white
+ */
 export function brightWhite(str: string): string {
   return run(str, code([97], 39));
 }
 
-/** Set background color to black. */
+/**
+ * Set background color to black.
+ * @param str text to make its background black
+ */
 export function bgBlack(str: string): string {
   return run(str, code([40], 49));
 }
 
-/** Set background color to red. */
+/**
+ * Set background color to red.
+ * @param str text to make its background red
+ */
 export function bgRed(str: string): string {
   return run(str, code([41], 49));
 }
 
-/** Set background color to green. */
+/**
+ * Set background color to green.
+ * @param str text to make its background green
+ */
 export function bgGreen(str: string): string {
   return run(str, code([42], 49));
 }
 
-/** Set background color to yellow. */
+/**
+ * Set background color to yellow.
+ * @param str text to make its background yellow
+ */
 export function bgYellow(str: string): string {
   return run(str, code([43], 49));
 }
 
-/** Set background color to blue. */
+/**
+ * Set background color to blue.
+ * @param str text to make its background blue
+ */
 export function bgBlue(str: string): string {
   return run(str, code([44], 49));
 }
 
-/** Set background color to magenta. */
+/**
+ *  Set background color to magenta.
+ * @param str text to make its background magenta
+ */
 export function bgMagenta(str: string): string {
   return run(str, code([45], 49));
 }
 
-/** Set background color to cyan. */
+/**
+ * Set background color to cyan.
+ * @param str text to make its background cyan
+ */
 export function bgCyan(str: string): string {
   return run(str, code([46], 49));
 }
 
-/** Set background color to white. */
+/**
+ * Set background color to white.
+ * @param str text to make its background white
+ */
 export function bgWhite(str: string): string {
   return run(str, code([47], 49));
 }
 
-/** Set background color to bright black. */
+/**
+ * Set background color to bright black.
+ * @param str text to make its background bright-black
+ */
 export function bgBrightBlack(str: string): string {
   return run(str, code([100], 49));
 }
 
-/** Set background color to bright red. */
+/**
+ * Set background color to bright red.
+ * @param str text to make its background bright-red
+ */
 export function bgBrightRed(str: string): string {
   return run(str, code([101], 49));
 }
 
-/** Set background color to bright green. */
+/**
+ * Set background color to bright green.
+ * @param str text to make its background bright-green
+ */
 export function bgBrightGreen(str: string): string {
   return run(str, code([102], 49));
 }
 
-/** Set background color to bright yellow. */
+/**
+ * Set background color to bright yellow.
+ * @param str text to make its background bright-yellow
+ */
 export function bgBrightYellow(str: string): string {
   return run(str, code([103], 49));
 }
 
-/** Set background color to bright blue. */
+/**
+ * Set background color to bright blue.
+ * @param str text to make its background bright-blue
+ */
 export function bgBrightBlue(str: string): string {
   return run(str, code([104], 49));
 }
 
-/** Set background color to bright magenta. */
+/**
+ * Set background color to bright magenta.
+ * @param str text to make its background bright-magenta
+ */
 export function bgBrightMagenta(str: string): string {
   return run(str, code([105], 49));
 }
 
-/** Set background color to bright cyan. */
+/**
+ * Set background color to bright cyan.
+ * @param str text to make its background bright-cyan
+ */
 export function bgBrightCyan(str: string): string {
   return run(str, code([106], 49));
 }
 
-/** Set background color to bright white. */
+/**
+ * Set background color to bright white.
+ * @param str text to make its background bright-white
+ */
 export function bgBrightWhite(str: string): string {
   return run(str, code([107], 49));
 }
 
 /* Special Color Sequences */
 
+/**
+ * Clam and truncate color codes
+ * @param n
+ * @param max number to truncate to
+ * @param min number to truncate from
+ */
 function clampAndTruncate(n: number, max = 255, min = 0): number {
   return Math.trunc(Math.max(Math.min(n, max), min));
 }
 
-/** Set text color using paletted 8bit colors.
- * https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit */
+/**
+ * Set text color using paletted 8bit colors.
+ * https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
+ * @param str text color to apply paletted 8bit colors to
+ * @param color code
+ */
 export function rgb8(str: string, color: number): string {
   return run(str, code([38, 5, clampAndTruncate(color)], 39));
 }
 
-/** Set background color using paletted 8bit colors.
- * https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit */
+/**
+ * Set background color using paletted 8bit colors.
+ * https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
+ * @param str text color to apply paletted 8bit background colors to
+ * @param color code
+ */
 export function bgRgb8(str: string, color: number): string {
   return run(str, code([48, 5, clampAndTruncate(color)], 49));
 }
 
-/** Set text color using 24bit rgb.
+/**
+ * Set text color using 24bit rgb.
  * `color` can be a number in range `0x000000` to `0xffffff` or
  * an `Rgb`.
  *
@@ -288,6 +439,8 @@ export function bgRgb8(str: string, color: number): string {
  *
  *      rgba24("foo", 0xff00ff);
  *      rgba24("foo", {r: 255, g: 0, b: 255});
+ * @param str text color to apply 24bit rgb to
+ * @param color code
  */
 export function rgb24(str: string, color: number | Rgb): string {
   if (typeof color === "number") {
@@ -314,7 +467,8 @@ export function rgb24(str: string, color: number | Rgb): string {
   );
 }
 
-/** Set background color using 24bit rgb.
+/**
+ * Set background color using 24bit rgb.
  * `color` can be a number in range `0x000000` to `0xffffff` or
  * an `Rgb`.
  *
@@ -322,6 +476,8 @@ export function rgb24(str: string, color: number | Rgb): string {
  *
  *      bgRgba24("foo", 0xff00ff);
  *      bgRgba24("foo", {r: 255, g: 0, b: 255});
+ * @param str text color to apply 24bit rgb to
+ * @param color code
  */
 export function bgRgb24(str: string, color: number | Rgb): string {
   if (typeof color === "number") {
@@ -357,7 +513,10 @@ const ANSI_PATTERN = new RegExp(
   "g",
 );
 
-/** Remove ANSI escape codes from the string. */
+/**
+ * Remove ANSI escape codes from the string.
+ * @param string to remove ANSI escape codes from
+ */
 export function stripColor(string: string): string {
   return string.replace(ANSI_PATTERN, "");
 }
diff --git a/std/fmt/printf.ts b/std/fmt/printf.ts
index c4c8c8e5c9..27d4acca94 100644
--- a/std/fmt/printf.ts
+++ b/std/fmt/printf.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-//
-// This implementation is inspired by POSIX and Golang but does not port
-// implementation code.
+/**
+ * This implementation is inspired by POSIX and Golang but does not port
+ * implementation code. */
 
 enum State {
   PASSTHROUGH,
@@ -169,6 +169,10 @@ class Printf {
     }
   }
 
+  /**
+   * Handle width or precision
+   * @param wOrP
+   */
   handleWidthOrPrecisionRef(wOrP: WorP): void {
     if (this.argNum >= this.args.length) {
       // handle Positional should have already taken care of it...
@@ -191,6 +195,10 @@ class Printf {
     this.argNum++;
   }
 
+  /**
+   * Handle width and precision
+   * @param flags
+   */
   handleWidthAndPrecision(flags: Flags): void {
     const fmt = this.format;
     for (; this.i !== this.format.length; ++this.i) {
@@ -245,6 +253,7 @@ class Printf {
     }
   }
 
+  /** Handle positional */
   handlePositional(): void {
     if (this.format[this.i] !== "[") {
       // sanity only
@@ -277,6 +286,7 @@ class Printf {
     return;
   }
 
+  /** Handle less than */
   handleLessThan(): string {
     // deno-lint-ignore no-explicit-any
     const arg = this.args[this.argNum] as any;
@@ -291,6 +301,7 @@ class Printf {
     return str + " ]";
   }
 
+  /** Handle verb */
   handleVerb(): void {
     const verb = this.format[this.i];
     this.verb = verb;
@@ -356,6 +367,10 @@ class Printf {
     }
   }
 
+  /**
+   * Pad a string
+   * @param s text to pad
+   */
   pad(s: string): string {
     const padding = this.flags.zero ? "0" : " ";
 
@@ -365,6 +380,12 @@ class Printf {
 
     return s.padStart(this.flags.width, padding);
   }
+
+  /**
+   * Pad a number
+   * @param nStr
+   * @param neg
+   */
   padNum(nStr: string, neg: boolean): string {
     let sign: string;
     if (neg) {
@@ -397,6 +418,12 @@ class Printf {
     return nStr;
   }
 
+  /**
+   * Format a number
+   * @param n
+   * @param radix
+   * @param upcase
+   */
   fmtNumber(n: number, radix: number, upcase = false): string {
     let num = Math.abs(n).toString(radix);
     const prec = this.flags.precision;
@@ -432,6 +459,10 @@ class Printf {
     return this.padNum(num, n < 0);
   }
 
+  /**
+   * Format number with code points
+   * @param n
+   */
   fmtNumberCodePoint(n: number): string {
     let s = "";
     try {
@@ -442,6 +473,10 @@ class Printf {
     return this.pad(s);
   }
 
+  /**
+   * Format special float
+   * @param n
+   */
   fmtFloatSpecial(n: number): string {
     // formatting of NaN and Inf are pants-on-head
     // stupid and more or less arbitrary.
@@ -462,6 +497,11 @@ class Printf {
     return "";
   }
 
+  /**
+   * Round fraction to precision
+   * @param fractional
+   * @param precision
+   */
   roundFractionToPrecision(fractional: string, precision: number): string {
     if (fractional.length > precision) {
       fractional = "1" + fractional; // prepend a 1 in case of leading 0
@@ -477,6 +517,11 @@ class Printf {
     return fractional;
   }
 
+  /**
+   * Format float E
+   * @param n
+   * @param upcase
+   */
   fmtFloatE(n: number, upcase = false): string {
     const special = this.fmtFloatSpecial(n);
     if (special !== "") {
@@ -504,6 +549,10 @@ class Printf {
     return this.padNum(val, n < 0);
   }
 
+  /**
+   * Format float F
+   * @param n
+   */
   fmtFloatF(n: number): string {
     const special = this.fmtFloatSpecial(n);
     if (special !== "") {
@@ -548,6 +597,11 @@ class Printf {
     return this.padNum(`${dig}.${fractional}`, n < 0);
   }
 
+  /**
+   * Format float G
+   * @param n
+   * @param upcase
+   */
   fmtFloatG(n: number, upcase = false): string {
     const special = this.fmtFloatSpecial(n);
     if (special !== "") {
@@ -605,6 +659,10 @@ class Printf {
     return nStr;
   }
 
+  /**
+   * Format string
+   * @param s
+   */
   fmtString(s: string): string {
     if (this.flags.precision !== -1) {
       s = s.substr(0, this.flags.precision);
@@ -612,6 +670,11 @@ class Printf {
     return this.pad(s);
   }
 
+  /**
+   * Format hex
+   * @param val
+   * @param upper
+   */
   fmtHex(val: string | number, upper = false): string {
     // allow others types ?
     switch (typeof val) {
@@ -644,6 +707,10 @@ class Printf {
     }
   }
 
+  /**
+   * Format value
+   * @param val
+   */
   fmtV(val: Record<string, unknown>): string {
     if (this.flags.sharp) {
       const options = this.flags.precision !== -1
@@ -656,6 +723,10 @@ class Printf {
     }
   }
 
+  /**
+   * Format JSON
+   * @param val
+   */
   fmtJ(val: unknown): string {
     return JSON.stringify(val);
   }
@@ -664,6 +735,9 @@ class Printf {
 /**
  * Converts and format a variable number of `args` as is specified by `format`.
  * `sprintf` returns the formatted string.
+ *
+ * @param format
+ * @param args
  */
 export function sprintf(format: string, ...args: unknown[]): string {
   const printf = new Printf(format, ...args);
@@ -673,6 +747,8 @@ export function sprintf(format: string, ...args: unknown[]): string {
 /**
  * Converts and format a variable number of `args` as is specified by `format`.
  * `printf` writes the formatted string to standard output.
+ * @param format
+ * @param args
  */
 export function printf(format: string, ...args: unknown[]): void {
   const s = sprintf(format, ...args);