diff --git a/ChangeLog.txt b/ChangeLog.txt
index e242c8af62ae0decff515ce5cbb1bcc4339e2a92..be44dbab444a9e1962d929dae728e5d7ffbe23e0 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -8,6 +8,7 @@ JSONlab ChangeLog (key features marked by *):
 
 == JSONlab 1.9 (codename: Magnus - alpha), FangQ <q.fang <at> neu.edu> ==
 
+ 2019-05-06 [25ad795] unescape string in loadjson.m
  2019-05-04 [2e317c9] explain extra compression fields
  2019-05-02 [1b1be65] avoid side effect of removing singletarray
  2019-05-02*[8360fd1] support zmat based base64 encoding and decoding
diff --git a/examples/jsonlab_ubjson_basictest.matlab b/examples/jsonlab_ubjson_basictest.matlab
new file mode 100644
index 0000000000000000000000000000000000000000..e16806ca6f28fd4502d88022f4b32c15ba98d84d
--- /dev/null
+++ b/examples/jsonlab_ubjson_basictest.matlab
@@ -0,0 +1,394 @@
+
+                            < M A T L A B (R) >
+                  Copyright 1984-2010 The MathWorks, Inc.
+                Version 7.11.0.584 (R2010b) 64-bit (glnxa64)
+                              August 16, 2010
+
+ 
+  To get started, type one of these: helpwin, helpdesk, or demo.
+  For product information, visit www.mathworks.com.
+ 
+>> >> >> >> >> >> >> >> >> 
+%=================================================
+>> %  a simple scalar value 
+>> %=================================================
+
+>> >> 
+data2json =
+
+    3.1416
+
+>> 
+ans =
+
+[D@	!ûTD-]
+
+>> 
+json2data = 
+
+    [3.1416]
+
+>> >> 
+%=================================================
+>> %  a complex number
+>> %=================================================
+
+>> >> >> 
+data2json =
+
+   1.0000 + 2.0000i
+
+>> 
+ans =
+
+{U_ArrayType_SUdoubleU_ArraySize_[$U#U

U_ArrayIsComplex_TU_ArrayData_[$i#U
}
+
+>> 
+json2data =
+
+   1.0000 + 2.0000i
+
+>> >> 
+%=================================================
+>> %  a complex matrix
+>> %=================================================
+
+>> >> >> 
+data2json =
+
+  35.0000 +26.0000i   1.0000 +19.0000i   6.0000 +24.0000i
+   3.0000 +21.0000i  32.0000 +23.0000i   7.0000 +25.0000i
+  31.0000 +22.0000i   9.0000 +27.0000i   2.0000 +20.0000i
+   8.0000 +17.0000i  28.0000 +10.0000i  33.0000 +15.0000i
+  30.0000 +12.0000i   5.0000 +14.0000i  34.0000 +16.0000i
+   4.0000 +13.0000i  36.0000 +18.0000i  29.0000 +11.0000i
+
+>> 
+ans =
+
+{U_ArrayType_SUdoubleU_ArraySize_[$U#UU_ArrayIsComplex_TU_ArrayData_[$i#[$U#U#
 	$!"

+}
+
+>> 
+json2data =
+
+  35.0000 +26.0000i   1.0000 +19.0000i   6.0000 +24.0000i
+   3.0000 +21.0000i  32.0000 +23.0000i   7.0000 +25.0000i
+  31.0000 +22.0000i   9.0000 +27.0000i   2.0000 +20.0000i
+   8.0000 +17.0000i  28.0000 +10.0000i  33.0000 +15.0000i
+  30.0000 +12.0000i   5.0000 +14.0000i  34.0000 +16.0000i
+   4.0000 +13.0000i  36.0000 +18.0000i  29.0000 +11.0000i
+
+>> >> 
+%=================================================
+>> %  MATLAB special constants
+>> %=================================================
+
+>> >> 
+data2json =
+
+   NaN   Inf  -Inf
+
+>> 
+ans =
+
+{Uspecials[$D#Uÿø      ð      ÿð      }
+
+>> 
+json2data = 
+
+    specials: [NaN Inf -Inf]
+
+>> >> 
+%=================================================
+>> %  a real sparse matrix
+>> %=================================================
+
+>> >> 
+data2json =
+
+   (1,2)       0.6557
+   (9,2)       0.7577
+   (3,5)       0.8491
+  (10,5)       0.7431
+  (10,8)       0.3922
+   (7,9)       0.6787
+   (2,10)      0.0357
+   (6,10)      0.9340
+  (10,10)      0.6555
+
+>> 
+ans =
+
+{Usparse{U_ArrayType_SUdoubleU_ArraySize_[$U#U
+
+U_ArrayIsSparse_TU_ArrayData_[$D#[$U#U	?ð      @"      @      @$      @$      @      @       @      @$      @       @       @      @      @       @"      @$      @$      @$      ?äûÓë12?è?h:öl;?ë,8Ù±?çǽ½æ'#?Ù?[`o€?å¸2ɘNé?¢HÍpà?íãEι¶P?äù¬Ä²	¶}}
+
+>> 
+json2data = 
+
+    sparse: [10x10 double]
+
+>> >> 
+%=================================================
+>> %  a complex sparse matrix
+>> %=================================================
+
+>> >> 
+data2json =
+
+   (1,2)      0.6557 - 0.6557i
+   (9,2)      0.7577 - 0.7577i
+   (3,5)      0.8491 - 0.8491i
+  (10,5)      0.7431 - 0.7431i
+  (10,8)      0.3922 - 0.3922i
+   (7,9)      0.6787 - 0.6787i
+   (2,10)     0.0357 - 0.0357i
+   (6,10)     0.9340 - 0.9340i
+  (10,10)     0.6555 - 0.6555i
+
+>> 
+ans =
+
+{Ucomplex_sparse{U_ArrayType_SUdoubleU_ArraySize_[$U#U
+
+U_ArrayIsComplex_TU_ArrayIsSparse_TU_ArrayData_[$D#[$U#U	?ð      @"      @      @$      @$      @      @       @      @$      @       @       @      @      @       @"      @$      @$      @$      ?äûÓë12?è?h:öl;?ë,8Ù±?çǽ½æ'#?Ù?[`o€?å¸2ɘNé?¢HÍpà?íãEι¶P?äù¬Ä²	¶¿äûÓë12¿è?h:öl;¿ë,8Ù±¿çǽ½æ'#¿Ù?[`o€¿å¸2ɘNé¿¢HÍpà¿íãEι¶P¿äù¬Ä²	¶}}
+
+>> 
+json2data = 
+
+    complex_sparse: [10x10 double]
+
+>> >> 
+%=================================================
+>> %  an all-zero sparse matrix
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Uall_zero_sparse{U_ArrayType_SUdoubleU_ArraySize_[$U#UU_ArrayIsSparse_TU_ArrayData_Z}}
+
+>> 
+json2data = 
+
+    all_zero_sparse: [2x3 double]
+
+>> >> 
+%=================================================
+>> %  an empty sparse matrix
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Uempty_sparseZ}
+
+>> 
+json2data = 
+
+    empty_sparse: []
+
+>> >> 
+%=================================================
+>> %  an empty 0-by-0 real matrix
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Uempty_0by0_realZ}
+
+>> 
+json2data = 
+
+    empty_0by0_real: []
+
+>> >> 
+%=================================================
+>> %  an empty 0-by-3 real matrix
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Uempty_0by3_realZ}
+
+>> 
+json2data = 
+
+    empty_0by3_real: []
+
+>> >> 
+%=================================================
+>> %  a sparse real column vector
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Usparse_column_vector{U_ArrayType_SUdoubleU_ArraySize_[$U#U
U_ArrayIsSparse_TU_ArrayData_[$i#[$U#U
}}
+
+>> 
+json2data = 
+
+    sparse_column_vector: [5x1 double]
+
+>> >> 
+%=================================================
+>> %  a sparse complex column vector
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Ucomplex_sparse_column_vector{U_ArrayType_SUdoubleU_ArraySize_[$U#U
U_ArrayIsComplex_TU_ArrayIsSparse_TU_ArrayData_[$i#[$U#U
ýÿü}}
+
+>> 
+json2data = 
+
+    complex_sparse_column_vector: [5x1 double]
+
+>> >> 
+%=================================================
+>> %  a sparse real row vector
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Usparse_row_vector{U_ArrayType_SUdoubleU_ArraySize_[$U#U
U_ArrayIsSparse_TU_ArrayData_[$i#[$U#U
}}
+
+>> 
+json2data = 
+
+    sparse_row_vector: [0 3 0 1 4]
+
+>> >> 
+%=================================================
+>> %  a sparse complex row vector
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{Ucomplex_sparse_row_vector{U_ArrayType_SUdoubleU_ArraySize_[$U#U
U_ArrayIsComplex_TU_ArrayIsSparse_TU_ArrayData_[$i#[$U#U
ýÿü}}
+
+>> 
+json2data = 
+
+    complex_sparse_row_vector: [1x5 double]
+
+>> >> 
+%=================================================
+>> %  a structure
+>> %=================================================
+
+>> >> 
+data2json = 
+
+        name: 'Think Different'
+        year: 1997
+       magic: [3x3 double]
+     misfits: [Inf NaN]
+    embedded: [1x1 struct]
+
+>> 
+ans =
+
+{Uastruct{UnameSUThink DifferentUyearIÍUmagic[$i#[$U#U
	Umisfits[$D#Uð      ÿø      Uembedded{UleftTUrightF}}}
+
+>> 
+json2data = 
+
+    astruct: [1x1 struct]
+
+>> >> 
+%=================================================
+>> %  a structure array
+>> %=================================================
+
+>> >> >> >> >> 
+ans =
+
+{USupreme Commander[{UnameSUNexus PrimeUranki	}{UnameSUSentinel PrimeUranki	}{UnameSU
Optimus PrimeUranki	}]}
+
+>> 
+json2data = 
+
+    Supreme_0x20_Commander: {[1x1 struct]  [1x1 struct]  [1x1 struct]}
+
+>> >> 
+%=================================================
+>> %  a cell array
+>> %=================================================
+
+>> >> >> >> >> 
+data2json = 
+
+    [1x1 struct]
+    [1x1 struct]
+    [1x4 double]
+
+>> 
+ans =
+
+{Udebian[[{UbuzzD?ñ™™™™™šUrexD?ó333333UboD?ôÌÌÌÌÌÍUhammiUslinkD@ ÌÌÌÌÌÍUpotatoD@
™™™™™šUwoodyiUsargeD@ÌÌÌÌÌÍUetchiUlennyiUsqueezeiUwheezyi}{UUbuntu[SUKubuntuSUXubuntuSULubuntu]}[$D#U@$záG®@$333333@&záG®@&333333]]}
+
+>> 
+json2data = 
+
+    debian: {{1x3 cell}}
+
+>> >> 
+%=================================================
+>> %  invalid field-name handling
+>> %=================================================
+
+>> >> 
+json2data = 
+
+               ValidName: 1
+       x0x5F_InvalidName: 2
+       x0x3A_Field_0x3A_: 3
+    x0xEFBFBD__0xEFBFBD_: '绝密'
+
+>> >> 
+%=================================================
+>> %  a 2D cell array
+>> %=================================================
+
+>> >> >> 
+ans =
+
+{U	data2json[[[[i
][[i][i]]][[i]]][[[i][i]][[i][i	]]][[[i]][[i
+]]]]}
+
+>> 
+json2data = 
+
+    data2json: {{1x2 cell}  {1x2 cell}  {1x2 cell}}
+
+>> >> 
+%=================================================
+>> %  a 2D struct array
+>> %=================================================
+
+>> >> 
+data2json = 
+
+2x3 struct array with fields:
+    idx
+    data
+
+>> >> 
+ans =
+
+{U	data2json[[{Uidxi
UdataSUstructs}{UidxiUdataSUstructs}][{UidxiUdataSUstructs}{UidxiUdataSUstructs}][{UidxiUdataSUstructs}{UidxiUdataSUstructs}]]}
+
+>> 
+json2data = 
+
+    data2json: {{1x2 cell}  {1x2 cell}  {1x2 cell}}
+
+>> >> >> >> 
\ No newline at end of file